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First I want to say thanks for info on your video, it really does help narrow things down. I read a comment here on their boiler having a high boiler pressure of 40 and like you said, it should be around 12-15 psi. I'm trying to diagnose my system which is currently reading at almost 0, I was thinking on opening the pressure valve, but what if I do that and pressure keeps going down? My expansion tank seems to be fine, water on top and air on the bottom, not full of water. Does this just happen overtime, we haven't done any piping around the house 🤔The main reason I was checking my boiler recently is because we lost heat on the second floor, and I don't think it's the zone heads. I thought maybe it was the second-floor zone head that was bad, but when I unwired a good zone from the first-floor, and hooked the possible bad head to the first floor, the heat on the first floor worked just fine and the good head for the second zone wasn't working. There is voltage going through the heads, thought when I call for heat on the second zone, the furnace doesn't fire up. I realized then that the PSI from my boiler was almost 0. What could this mean?
Unfortunately it could be a leak somewhere, if it won’t fill then the water is leaking out somewhere. But you pressure reducing valve should be letting water in until it hits set point
I have a Weil-Mclain boiler heating my two flat. Thermostat is on the first floor. Thermosta is at 74 degrees and 1st florr is very warm, but secind floor is not warming, or not as warm. Ill be wearing a bathing suit on the first floor soon just to get the secimd floor warm enough?
Do you have more than one thermostat or zone? If the upstairs is not heating up you probably have air locked sections and need it purged if there's not a zone valve there or something that's failed but if you don't have a thermostat then you shouldn't have a separate zone valve to worry about... bleeding the lines is normally a relatively easy fix
Thank you for your video. I'm in the process of trying to figure out why my boiler is not heating and if I need to replace the system and all this would entail - such as: what system to purchase, who should I hire, what should it cost, what kind of warranty should one expect on equipment and installation, what should home owner prepare to do (maintenance) in order to keep system in top notch shape, how long should one expect a boiler heating system to last?
For what it’s worth we prefer cast iron systems even though they’re less efficient because the cast iron boilers are just generally more durable than a combi boiler. Some people are just “gung ho” on high efficiency and dead set but really cast iron is much less maintenance, and if you did nothing to it at all it would likely be 5-10 years or more before your first service call. Whereas combi boilers are definitely more finicky if not maintained / flushed periodically. This makes more sense on propane because it’s so expensive (at least in Colorado, anywhere from $2-$3 a gallon) so it really makes efficiency count.
My Boiler is 54 years old 3 Zone and they can last a hundred years as long as the cast iron is good. All components are available and replaceable. My National US boiler has had the pump replaced a few times. The Honeywell zones changed one time as has expansion tank. Still have original gas valve and high temp cutoff. The 24 volt to 110 volt relay replaced once and one of the 24 volt transformers. Still have the original Honeywell mercury thermostats. I keep plenty of Hydronic #5 Inhiibitor in it which lubricates the valves and pump and stops rust. Have a GRUNDFOS circulator pump on it which used to.5 amp electricity. I keep extra thermocouples on hand in case pilot goes out. Always leave the pilot on if in basement to keep the sections dry. Boilers last indefinitely and very affordable gas bills. The best heat EVER.
I have a Dunkirk boiler at our church that won’t ignite. Initially I had a two flashes for the code. I found the flame roll out switch broken so I replaced it. Now I have four flashes for the code & still won’t ignite. This system has electronic ignition & the control module buzzes when I turn the power on but no spark @ the ignitor. Any suggestions what I should check next. John
Without knowing what that code is I don’t know, sounds like an igniter is bad/burnt out maybe… but find out what that code means it will be in the manual for the boiler, flashes aren’t universal from system to system but it will tell you what that means in the manual for that model. Check that before replacing more parts because it could be several things
Pressure relief valve is tripping? You have pressure issues... could be bad expansion tank and Pressure reducing valve backflow preventer assembly is bad if the pressure is climbing over 30. Expansion tank is common failure point on these
We had the expansion tank and the pressure switch replaced in 2023just turned it on for the winter and we're not getting no heat because we are only getting 5 psi. Plus the water pump never never shut off.
Once there’s a call for heat it should open up right away… if the zone is not heating / circulating might be bad valve if everything else is open, assuming it’s not air locked and plumbed correctly. If it’s always worked before now and just stopped and the other zones are heating I wouldn’t be surprised if the valve went bad
Yes, depends on the system though. If you have a high efficiency system setup in a cascade (multiple systems daisy chained for example) it can get very complicated very quickly, really have to see these ones in person because they’re all piped differently.
If it’s not shutting off at the set point then there’s something wrong with the aquastat most likely because it’s not shutting the boiler off when temp is satisfied.
My Honeywell thermometer works for cooling but doesn’t turn on the heat. However when the downstairs thermometer is on for heat, the top floor thermometer suddenly work for the heat. Any ideas? Thanks
Apartment buildings are pretty much the same just depends on how big of a building… if you’re talking about a system with more than 10 zones it’s probably a little more complicated. But zone valves, pumps, and pressure issues are the most common causes as well as air locked in the zones / or sediment buildup over time will substantially impede flow and eventually cause issues
Thank you Sir. Have you ever been in a situation where you have to do hot water heater work on an apartment multifamily and need to drain the tank and open a hot water faucet to do a repair but you don't have access because you're in a hot water heater room?
Hi My moms boiler is 24 years old and recently wont turn off even with the thermostat off? aquastat was replaced 2 years ago,,it heats the house but when it reaches set temp it still runs
Could be a lot of issues like the end switch on a zone valve closed or something with the thermostat. I’d guess a zone valve is burnt out and end switch is stucj
Every system is different you have to find your purge points, isolate you loops with ball valves (they should have isolation valves) and make sure the pump doesn't have a back flow preventer in the pump (not the system, system always has a back flow preventer). But the back flow preventers in the pumps always make it difficult to purge if you need to purge through the pump. Then you purge through each zone one by one. If you have radiant floors it's a different process because you have glycol or should have glycol.
Glycol mean you purge with glycol and a trash can until you get the mix to the right concentration but you want to do this before draining the system otherwise you'll have wasted a lot of glycol unless you're recharging the system with fresh glycol again
Hello, I’m trying to begin diagnosing my boiler in my home, I’m a auto tech so this is definitely new to me, but I have no heat in the house I’ve tried the most basic and replacing the battery’s in the thermostat to no help. I went down to the boiler while my girlfriend turned it on and I can hear it start up but no flames are lit at the bottom where there’s a cover u can pull off. Any help would be appreciated. I’m 99%sure someone has mentioned to me I should replace my expansion tank, but I’m not sure if that’s what’s cause it
Boilers can be pretty hard to diagnose without experience honestly because you have to see the setup. Depends on what you have going on and how old the boiler is. Has it been replaced in the past 10 years? If the flames are not igniting it’s not going into the ignition sequence so you’d want to start checking for voltage. If you have zone valves and the end switches aren’t closing that can cause it not to start the ignition sequence. Is it natural draft or induced draft? If the inducer is coming or that’s a tell that it’s calling for heat but not igniting for some reason. If it’s natural draft but newer it will have a damper on the exhaust that opens during the start of the ignition sequence on a calm for heat. It might be worth it to have someone come out and diagnose it because by comparison with forced air it is easy to throw a lot of money and parts at a boiler and not actually fix what’s wrong. If the water is low you have a low water cut off on some systems that will trip. If the boiler has an igniter vs a pilot the igniter could be out, or if the pilots out that’s often a very simple fix and just a matter of replacing the thermocouple so you can get the pilot to stay on. Hopefully that helps give you a few places to start!
Did you check for power at the aquastat to make sure it was the problem first? If the circulator isn’t kicking on check for power at the aquastat circ terminals when there’s a call for heat / jumper heat, but your circulator won’t kick on if it’s not firing. It sounds like it’s not firing because it’s not responding to a call for heat so I’d verify the 24v call for heat first. Hope that helps!
I have 3 zones in my house and one zone is very warm, 73 degrees when I turn it to 60 for nighttime sleeping, regardless of what I set my Thermostat at, or if I turn it off. What should I troubleshoot the end switch? Thanks
Sounds like the zone valve is stuck open, normally we replace the body and motor (the silver box if you have a Honeywell zone valve)… not sure if anything has been repiped recently because if so then it could be a plumbing or wiring issue but if it just started happening sounds like a stuck end switch. Replacing the zone body will replace the end switch and motor too
Thanks for your reply, I was thinking the same thing. Also hoping there was a way to close the valve manually. Yes I have 3 Honeywell silver boxes.@@TheHVACDopeShow
I have high pressure about 40psi what can be the cause of this it was running fine at 20-27 psi around there and then went up gradually stopped at 40 for now ?
Pressure reducing is stuck or bad. It should be 12-14. 20-22 on the high side when it’s hot but if you’re expansion tank is the right size or big enough to cover the expansion normally it will hold under 20 psi.
We have a problem. We will see if I can figure it out. 4 zone Navien dual HW heating and on demand HW. 3 out of 4 zones function correctly. WE have unlimited HW from the tap. I figured it was a T stat so we ordered a digital one. (no idea why they'd install mercury switch) It has not yet arrived. Looking into manually flipping it on. I find an issue. Lever flops like it is not even connected to anything. I also see stripped gears on the lever. Motor appears normal. I tend to believe something internal to the lever is busted. I removed the power head. The pin that would be attached to the rubber ball moves freely about 1/4 turn or so. I will be picking up a new power head tomorrow. Hoping it is an easy fix at least
The lever will be loose when it’s powered that’s how you know it’s engaged (Honeywell zone valve) but if it’s like that when it’s loose it might not be making good contact or just be a bad valve, we see that sometimes on the powerheads
@@TheHVACDopeShow forgot to mention. The gears on the lever are so stripped that it can't hit the END switch. I am just hoping I don't need to replace the ball part. The new valve comes with it just in case. It also appears the motor does not stop spinning
@@TheHVACDopeShow I replaced the power head today. When it calls for heat. I see it move the lever. A red light on the controller comes on starting the pump but still no hot water going through. I then turned of all T stats. On the 3 that are fine. I manually opened each valve and then closed it. I hear water when I shut it off. Makes a noise. With the one that is a problem. I don't hear the noise the other 3 make. I am stumped now and migh need to have someone replace the rubber ball.
@@TheHVACDopeShow Had a plumber come by. He seems to think it is ice. Been down to -26C for a few days, Warmed up to -4 today. Supposed to get +5C on Sunday. When I was talking to him, I had an AHA moment. I think what went wrong is the valve lever stripped and failed. Had no way to open the valve. I felt the pipes and did note 3 were hot and one with the failed valve was quite warm. So the water stopped flowing. At that the pipes froze somewhere along a wall. He thinks he knows which radiator pipe it is based on water coming out of individual valves on each radiator. One of two things is going to happen. We will be fine and water will start flowing as normal. 2, Mop and buckets. Hoping for the best. lol.
Hi, I have a radiant system that uses a Takagi TK-3 tankless water heater. While I've had lots of issues with the system, the most recent one was a head scratcher that I'm hoping maybe someone has some thoughts as to what may have been going. The system had ignition issues this fall when I first fired it up this season, the burner would ignite and then blow out a few minutes later and throw a flame blow out error on the circuit. After doing lots of diagnosing, I replace the ignition rod and flame sensor to find that it was still having issues. Upon testing, I determined my gas supply was sufficient for the system and due to deductive reasoning, took an educated guess that the gas manifold/solenoid had failed. I found a new replacement and installed it and it started working again. Here is where I'm noticing a strange but positive result from replacing the part. 1. The burner is nearly quiet now compared to before, I suspect it was not burning very efficiently with the failing gas manifold. But more importantly 2. The house is heating better and the system is running less than it used to. Before the system would start with a 2-2.5 gpm flow rate but drop down to 1.2 or so after it ran for a couple hours. Over night the house couldn't hold temp and I'd notice the system would struggle to reheat during the day. After replacing the manifold, the house holds temp at night and no longer has to run continuously and the flow rate is holding steady at around 2.1 gpm which is what was suggested in the Takagi manual for residential closed loop heating systems. So I'm wondering if you have any idea as to why the manifold would fix all the issues I was having. Why my flow rate from pumps on each loop (Grundfos 3 speed 120v pumps) is steady, and why the house is staying warm even on nights that dip into the teens or lower? Appreciate any feedback, just recently found the channel and love the content!
Oh and the burner was able to get the water to the 140F set temp before and after. I see about a 20F temp drop from input to output temps which is in range of what I was seeing before the manifold failed. Should have mentioned that in my question. The system covers mostly an in floor heating loop but also covers a second baseboard loop in the basement. For what its worth, it does appear to be somewhat poorly designed the power vent is shared with my water heater to the chimney vent stack and the install manual absolutely says that is not a correct setup. I still need to figure out how that can be fixed (if possible)
Sounds like the installer maybe took some shortcuts. When you say manifold do you mean gas valve? Or manifold? Not familiar with that brand but if it’s quieter too one thing I’ve seen is people running the wrong Venturi (mixes air and gas) for LP vs natural gas and the system will sound terrible when that’s happening like a jet engine. It sounds like a few bad parts. My first guess was the heat exchanger was getting dirty or something (I’ve seen those clog and need be cleaned out after being clogged). But it just sounds like you had several issues causing it to not function properly and now that the flow rate has returned you’re getting better heat transfer in the home.
And the PVC exhaust probably just needs a separate dedicated exhaust is what it sounds like (in terms of how to fix that part). Which can be done and is not a big deal.
One thing about baseboard temps vs radiant floor temps… you should have mixing valves in there to keep the radiant floor below 130/135 F and the baseboard loops should be allowed to get up 180F or more. Anything under 180F on baseboards significantly cuts down your baseboard efficiency.
@@TheHVACDopeShow Thanks for the responses, lots here to respond to. So the part is called the "Manifold assemby" which includes multiple solenoids and attached is the manifold that gas is directed to the burner. It probably was clogged but nearly impossible to take apart and a replacement was reasonably priced. The system was already in place when we purchased the house 3 years ago but I believe it was installed in 2004. It was lacking a refill valve and PRV so it would run low on water for the previous owner. I added one and found both pumps had failed, replaced those, the air scrubber was bad, serviced that. If you can't tell it was a mess. Thankfully its fairly easy plumbing and I was taught plumbing growing up so replacing parts was certainly not a challenge.
Too bad i live in Otis, Colorado...My boiler will not heat upstairs.. Downstairs is fine ..There are 3 box looking things with wires on them one of them is hot before and after the box looking thing however one is cold after the box thing please help im on a very fixed budget and cant afford a big bill...
It could be a bad zone valve (the three things you're referring to as "boxes")... if heat isn't flowing and the thermostat is on it's either a bad connection or bad zone valve. There's a lever on top that allows you to open the valve manually, that will allow that zone to heat
Here to help pass my gas exam haha. Appreciate the help on the Zone valves
Nice haha good luck on the exam 🙌
For more videos like this on how you can get the best HVAC for your home and avoid common mistakes, make sure you’re subscribed to the channel here youtube.com/@TheHVACDopeShow?sub_confirmation=1
First I want to say thanks for info on your video, it really does help narrow things down. I read a comment here on their boiler having a high boiler pressure of 40 and like you said, it should be around 12-15 psi. I'm trying to diagnose my system which is currently reading at almost 0, I was thinking on opening the pressure valve, but what if I do that and pressure keeps going down? My expansion tank seems to be fine, water on top and air on the bottom, not full of water. Does this just happen overtime, we haven't done any piping around the house 🤔The main reason I was checking my boiler recently is because we lost heat on the second floor, and I don't think it's the zone heads. I thought maybe it was the second-floor zone head that was bad, but when I unwired a good zone from the first-floor, and hooked the possible bad head to the first floor, the heat on the first floor worked just fine and the good head for the second zone wasn't working. There is voltage going through the heads, thought when I call for heat on the second zone, the furnace doesn't fire up. I realized then that the PSI from my boiler was almost 0. What could this mean?
Unfortunately it could be a leak somewhere, if it won’t fill then the water is leaking out somewhere. But you pressure reducing valve should be letting water in until it hits set point
And by set point I mean pressure set point on the PRV
Great vid. Straight to the point. Greetings from Southern Ontario, Canada
Thanks!
I have a Weil-Mclain boiler heating my two flat. Thermostat is on the first floor. Thermosta is at 74 degrees and 1st florr is very warm, but secind floor is not warming, or not as warm. Ill be wearing a bathing suit on the first floor soon just to get the secimd floor warm enough?
Do you have more than one thermostat or zone? If the upstairs is not heating up you probably have air locked sections and need it purged if there's not a zone valve there or something that's failed but if you don't have a thermostat then you shouldn't have a separate zone valve to worry about... bleeding the lines is normally a relatively easy fix
Thank you for your video. I'm in the process of trying to figure out why my boiler is not heating and if I need to replace the system and all this would entail - such as: what system to purchase, who should I hire, what should it cost, what kind of warranty should one expect on equipment and installation, what should home owner prepare to do (maintenance) in order to keep system in top notch shape, how long should one expect a boiler heating system to last?
For what it’s worth we prefer cast iron systems even though they’re less efficient because the cast iron boilers are just generally more durable than a combi boiler. Some people are just “gung ho” on high efficiency and dead set but really cast iron is much less maintenance, and if you did nothing to it at all it would likely be 5-10 years or more before your first service call. Whereas combi boilers are definitely more finicky if not maintained / flushed periodically. This makes more sense on propane because it’s so expensive (at least in Colorado, anywhere from $2-$3 a gallon) so it really makes efficiency count.
My Boiler is 54 years old 3 Zone and they can last a hundred years as long as the cast iron is good. All components are available and replaceable. My National US boiler has had the pump replaced a few times. The Honeywell zones changed one time as has expansion tank. Still have original gas valve and high temp cutoff. The 24 volt to 110 volt relay replaced once and one of the 24 volt transformers. Still have the original Honeywell mercury thermostats. I keep plenty of Hydronic #5 Inhiibitor in it which lubricates the valves and pump and stops rust. Have a GRUNDFOS circulator pump on it which used to.5 amp electricity. I keep extra thermocouples on hand in case pilot goes out. Always leave the pilot on if in basement to keep the sections dry. Boilers last indefinitely and very affordable gas bills. The best heat EVER.
My electric boiler for my in floor heat lost pressure. Wright - Hennepin Cooperative Electric boiler.
I have a Dunkirk boiler at our church that won’t ignite. Initially I had a two flashes for the code. I found the flame roll out switch broken so I replaced it. Now I have four flashes for the code & still won’t ignite. This system has electronic ignition & the control module buzzes when I turn the power on but no spark @ the ignitor. Any suggestions what I should check next. John
Without knowing what that code is I don’t know, sounds like an igniter is bad/burnt out maybe… but find out what that code means it will be in the manual for the boiler, flashes aren’t universal from system to system but it will tell you what that means in the manual for that model. Check that before replacing more parts because it could be several things
The spout on the side of leaks water when the boiler kicks on
Pressure relief valve is tripping? You have pressure issues... could be bad expansion tank and Pressure reducing valve backflow preventer assembly is bad if the pressure is climbing over 30. Expansion tank is common failure point on these
Thank you
We had the expansion tank and the pressure switch replaced in 2023just turned it on for the winter and we're not getting no heat because we are only getting 5 psi. Plus the water pump never never shut off.
Pressure is low... pressure reducing fill valve not working?
Agree, pressure regulator needs changed.
on the taco zone valves how long do they typically take before opening enough to call for heat if one is taking longer than others is it going bad?
Once there’s a call for heat it should open up right away… if the zone is not heating / circulating might be bad valve if everything else is open, assuming it’s not air locked and plumbed correctly. If it’s always worked before now and just stopped and the other zones are heating I wouldn’t be surprised if the valve went bad
The old taco zone valves melt wax before the valve opens it can take 1.5 minutes to open but if it’s much longer it’s probably failing.
Are these common problems on a multi family apartment building boiler system also?
Yes, depends on the system though. If you have a high efficiency system setup in a cascade (multiple systems daisy chained for example) it can get very complicated very quickly, really have to see these ones in person because they’re all piped differently.
Temperature on furnace is reaching 250 degrees. Water and steam are shooting out of the relief valve. Trying to figure out why water is overheating.
If it’s not shutting off at the set point then there’s something wrong with the aquastat most likely because it’s not shutting the boiler off when temp is satisfied.
My Honeywell thermometer works for cooling but doesn’t turn on the heat. However when the downstairs thermometer is on for heat, the top floor thermometer suddenly work for the heat. Any ideas? Thanks
Probably a bad zone valve or wired incorrectly... if one zone valve is stuck open when the other calls it will circulate both zones
Trying to find answers for most common boiler system problems on apartment multi family buildings.
I’d start with the zone valves
Apartment buildings are pretty much the same just depends on how big of a building… if you’re talking about a system with more than 10 zones it’s probably a little more complicated. But zone valves, pumps, and pressure issues are the most common causes as well as air locked in the zones / or sediment buildup over time will substantially impede flow and eventually cause issues
Thank you Sir. Have you ever been in a situation where you have to do hot water heater work on an apartment multifamily and need to drain the tank and open a hot water faucet to do a repair but you don't have access because you're in a hot water heater room?
Forgot to mention that I have a Brrnham boiler as my heat source.
Hi My moms boiler is 24 years old and recently wont turn off even with the thermostat off? aquastat was replaced 2 years ago,,it heats the house but when it reaches set temp it still runs
Could be a lot of issues like the end switch on a zone valve closed or something with the thermostat. I’d guess a zone valve is burnt out and end switch is stucj
I replaced my peerless boiler circulation pump. Not sure how to bleed the system.
Every system is different you have to find your purge points, isolate you loops with ball valves (they should have isolation valves) and make sure the pump doesn't have a back flow preventer in the pump (not the system, system always has a back flow preventer). But the back flow preventers in the pumps always make it difficult to purge if you need to purge through the pump. Then you purge through each zone one by one. If you have radiant floors it's a different process because you have glycol or should have glycol.
Glycol mean you purge with glycol and a trash can until you get the mix to the right concentration but you want to do this before draining the system otherwise you'll have wasted a lot of glycol unless you're recharging the system with fresh glycol again
Hello, I’m trying to begin diagnosing my boiler in my home, I’m a auto tech so this is definitely new to me, but I have no heat in the house I’ve tried the most basic and replacing the battery’s in the thermostat to no help. I went down to the boiler while my girlfriend turned it on and I can hear it start up but no flames are lit at the bottom where there’s a cover u can pull off. Any help would be appreciated. I’m 99%sure someone has mentioned to me I should replace my expansion tank, but I’m not sure if that’s what’s cause it
Boilers can be pretty hard to diagnose without experience honestly because you have to see the setup. Depends on what you have going on and how old the boiler is. Has it been replaced in the past 10 years? If the flames are not igniting it’s not going into the ignition sequence so you’d want to start checking for voltage. If you have zone valves and the end switches aren’t closing that can cause it not to start the ignition sequence. Is it natural draft or induced draft? If the inducer is coming or that’s a tell that it’s calling for heat but not igniting for some reason. If it’s natural draft but newer it will have a damper on the exhaust that opens during the start of the ignition sequence on a calm for heat. It might be worth it to have someone come out and diagnose it because by comparison with forced air it is easy to throw a lot of money and parts at a boiler and not actually fix what’s wrong. If the water is low you have a low water cut off on some systems that will trip. If the boiler has an igniter vs a pilot the igniter could be out, or if the pilots out that’s often a very simple fix and just a matter of replacing the thermocouple so you can get the pilot to stay on. Hopefully that helps give you a few places to start!
My Bryant BW1aan is not firing, I change the Aquastat, added a thermocouple. don't hear the circulator pump how to look for the problem
Did you check for power at the aquastat to make sure it was the problem first? If the circulator isn’t kicking on check for power at the aquastat circ terminals when there’s a call for heat / jumper heat, but your circulator won’t kick on if it’s not firing. It sounds like it’s not firing because it’s not responding to a call for heat so I’d verify the 24v call for heat first. Hope that helps!
I'm in of a pickle no heat . Need help live in Bronx NYC can you recommend someone.
Master comfort or Binaku? I don’t know any I just looked up on google they seem to have good reviews, not sure who you’ve tried calling already
Yost and Campbell also showed up as highly rated
I have 3 zones in my house and one zone is very warm, 73 degrees when I turn it to 60 for nighttime sleeping, regardless of what I set my Thermostat at, or if I turn it off. What should I troubleshoot the end switch? Thanks
Sounds like the zone valve is stuck open, normally we replace the body and motor (the silver box if you have a Honeywell zone valve)… not sure if anything has been repiped recently because if so then it could be a plumbing or wiring issue but if it just started happening sounds like a stuck end switch. Replacing the zone body will replace the end switch and motor too
Thanks for your reply, I was thinking the same thing. Also hoping there was a way to close the valve manually. Yes I have 3 Honeywell silver boxes.@@TheHVACDopeShow
You havea a defective zone valve that is not closing and causing leakage through when another zone calls for heat.
Honeywell zone valves are the best. If bad you just change the head. No plumbing required.
I have high pressure about 40psi what can be the cause of this it was running fine at 20-27 psi around there and then went up gradually stopped at 40 for now ?
Pressure reducing is stuck or bad. It should be 12-14. 20-22 on the high side when it’s hot but if you’re expansion tank is the right size or big enough to cover the expansion normally it will hold under 20 psi.
We have a problem. We will see if I can figure it out. 4 zone Navien dual HW heating and on demand HW. 3 out of 4 zones function correctly. WE have unlimited HW from the tap. I figured it was a T stat so we ordered a digital one. (no idea why they'd install mercury switch) It has not yet arrived. Looking into manually flipping it on. I find an issue. Lever flops like it is not even connected to anything. I also see stripped gears on the lever. Motor appears normal. I tend to believe something internal to the lever is busted. I removed the power head. The pin that would be attached to the rubber ball moves freely about 1/4 turn or so. I will be picking up a new power head tomorrow. Hoping it is an easy fix at least
Sounds like a bad zone valve lmk if it fixes it!
The lever will be loose when it’s powered that’s how you know it’s engaged (Honeywell zone valve) but if it’s like that when it’s loose it might not be making good contact or just be a bad valve, we see that sometimes on the powerheads
@@TheHVACDopeShow forgot to mention. The gears on the lever are so stripped that it can't hit the END switch. I am just hoping I don't need to replace the ball part. The new valve comes with it just in case. It also appears the motor does not stop spinning
@@TheHVACDopeShow I replaced the power head today. When it calls for heat. I see it move the lever. A red light on the controller comes on starting the pump but still no hot water going through. I then turned of all T stats. On the 3 that are fine. I manually opened each valve and then closed it. I hear water when I shut it off. Makes a noise. With the one that is a problem. I don't hear the noise the other 3 make. I am stumped now and migh need to have someone replace the rubber ball.
@@TheHVACDopeShow Had a plumber come by. He seems to think it is ice. Been down to -26C for a few days, Warmed up to -4 today. Supposed to get +5C on Sunday. When I was talking to him, I had an AHA moment. I think what went wrong is the valve lever stripped and failed. Had no way to open the valve. I felt the pipes and did note 3 were hot and one with the failed valve was quite warm. So the water stopped flowing. At that the pipes froze somewhere along a wall. He thinks he knows which radiator pipe it is based on water coming out of individual valves on each radiator. One of two things is going to happen. We will be fine and water will start flowing as normal. 2, Mop and buckets. Hoping for the best. lol.
Hi, I have a radiant system that uses a Takagi TK-3 tankless water heater. While I've had lots of issues with the system, the most recent one was a head scratcher that I'm hoping maybe someone has some thoughts as to what may have been going. The system had ignition issues this fall when I first fired it up this season, the burner would ignite and then blow out a few minutes later and throw a flame blow out error on the circuit. After doing lots of diagnosing, I replace the ignition rod and flame sensor to find that it was still having issues. Upon testing, I determined my gas supply was sufficient for the system and due to deductive reasoning, took an educated guess that the gas manifold/solenoid had failed. I found a new replacement and installed it and it started working again. Here is where I'm noticing a strange but positive result from replacing the part. 1. The burner is nearly quiet now compared to before, I suspect it was not burning very efficiently with the failing gas manifold. But more importantly 2. The house is heating better and the system is running less than it used to. Before the system would start with a 2-2.5 gpm flow rate but drop down to 1.2 or so after it ran for a couple hours. Over night the house couldn't hold temp and I'd notice the system would struggle to reheat during the day. After replacing the manifold, the house holds temp at night and no longer has to run continuously and the flow rate is holding steady at around 2.1 gpm which is what was suggested in the Takagi manual for residential closed loop heating systems. So I'm wondering if you have any idea as to why the manifold would fix all the issues I was having. Why my flow rate from pumps on each loop (Grundfos 3 speed 120v pumps) is steady, and why the house is staying warm even on nights that dip into the teens or lower? Appreciate any feedback, just recently found the channel and love the content!
Oh and the burner was able to get the water to the 140F set temp before and after. I see about a 20F temp drop from input to output temps which is in range of what I was seeing before the manifold failed. Should have mentioned that in my question. The system covers mostly an in floor heating loop but also covers a second baseboard loop in the basement. For what its worth, it does appear to be somewhat poorly designed the power vent is shared with my water heater to the chimney vent stack and the install manual absolutely says that is not a correct setup. I still need to figure out how that can be fixed (if possible)
Sounds like the installer maybe took some shortcuts. When you say manifold do you mean gas valve? Or manifold? Not familiar with that brand but if it’s quieter too one thing I’ve seen is people running the wrong Venturi (mixes air and gas) for LP vs natural gas and the system will sound terrible when that’s happening like a jet engine. It sounds like a few bad parts. My first guess was the heat exchanger was getting dirty or something (I’ve seen those clog and need be cleaned out after being clogged). But it just sounds like you had several issues causing it to not function properly and now that the flow rate has returned you’re getting better heat transfer in the home.
And the PVC exhaust probably just needs a separate dedicated exhaust is what it sounds like (in terms of how to fix that part). Which can be done and is not a big deal.
One thing about baseboard temps vs radiant floor temps… you should have mixing valves in there to keep the radiant floor below 130/135 F and the baseboard loops should be allowed to get up 180F or more. Anything under 180F on baseboards significantly cuts down your baseboard efficiency.
@@TheHVACDopeShow Thanks for the responses, lots here to respond to. So the part is called the "Manifold assemby" which includes multiple solenoids and attached is the manifold that gas is directed to the burner. It probably was clogged but nearly impossible to take apart and a replacement was reasonably priced. The system was already in place when we purchased the house 3 years ago but I believe it was installed in 2004. It was lacking a refill valve and PRV so it would run low on water for the previous owner. I added one and found both pumps had failed, replaced those, the air scrubber was bad, serviced that. If you can't tell it was a mess. Thankfully its fairly easy plumbing and I was taught plumbing growing up so replacing parts was certainly not a challenge.
No heat on purpose
Too bad i live in Otis, Colorado...My boiler will not heat upstairs.. Downstairs is fine ..There are 3 box looking things with wires on them one of them is hot before and after the box looking thing however one is cold after the box thing please help im on a very fixed budget and cant afford a big bill...
It could be a bad zone valve (the three things you're referring to as "boxes")... if heat isn't flowing and the thermostat is on it's either a bad connection or bad zone valve. There's a lever on top that allows you to open the valve manually, that will allow that zone to heat
@TheHVACDopeShow ..I gave it a tap and it started working in a bit...Too bad y'all don't come out this far.