BOILER KEEPS LOSING PRESSURE - WHY AND HOW TO FIX - Plumbing tips
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- Опубликовано: 26 апр 2024
- Does the pressure in your Combi boiler or heating system boiler keep dropping? Here's how to fix it! We'll show you why it happens, and how to fix it. We'll show you how the filling loop works with mains pressure, we'll show you how the expansion vessel works and can fail, how the high pressure relief valve can release pressure and how a lack of inhibitor can cause air and a drop in pressure.
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My hot water pressure is very low. I have checked in all the taps and also the boiler pressure gauge pipe is not working. Normally it makes sound when i fill up the pressure but this time it's not making any sound so it means the water is not going into boiler. Please advice me. Thank you.
P
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loads of thanks for this. my boiler keeps losing pressure. it's a new boiler, so i know it's not that. but my bathroom radiator valve (not a modern rtv, just a knob) leaks and goes cold after a time, even when heating is still on. might it be this causing the loss of pressure? and do you have any videos about how to change it to a new rtv? [el'sda2].
@Maximus Hamza what are you saying, we should all hack your girlfriends account ?
Another tip for combi boiler pressure drops. After trying all the above, if you’re still getting a drop you can fit 2 isolation valves under the boiler on the flow and return. Isolate this for 2 days and check pressure after. If it drops then it’s the boiler, if it holds and then drops after you open valves then it’s the pipe work.
I am actually a plumber who is 63 , so our young friend is great for me to keep constantly updated ,, plus he is a really nice guy , thanks for sharing your knowledge , I can see you are going a long way ,,
Thanks man!
Best video on boiler problems out there. Well done and thanks. You have helped me understand my problem comprehensively and it cost me nothing. Thanks again!
Currently working towards my nvq level 3 in plumbing and gas safe . Your videos help me a lot , thanks
Thanks for that clear explanation. I 'stumbled on' this vid not quite a week after I'd called out a tech-specialist plumber (Warranty Ts&Cs ) who found 'zackly what you described - a deflated pressure expansion 'balloon' and a gushing px. release valve hidden low down behind some spare bricks. Less than 5 minutes to diagnose, 20 minutes to service in and out..... and on his way. I really like it when a skilled pro works fast and right, like that.
Thanks man, very helpful and informative! Found a small leakage in my bathroom radiator..
Very well explained and loved the little drawings, made it so easy to follow! Thanks for sharing mate.
Great video, thanks for posting. Used the bike pump trick to add a bit of air into the expansion vessel as it had been dropping pressure, and had gone through the other trouble shooting. Hopefully it'll get the boiler through the winter. It's on borrowed time to be fair, but not in a rush to replace it! Thanks again!
I always find these videos extremely helpful. Was losing pressure, looked around and found o ring on magnetic filter was seeping. Opened filter cleaned it out (really horrible job) and replaced o ring with a new one. Pressure remains constant. Thank you very much!
Dont forget also tighten up the heat exchanger to it's back plate & rubber washers, this happens on a Viessmann 200W boiler
Extremely helpful video, thank you. Very clear and unambiguous as usual. Thank you
My friend is a heating engineer and we have this issue so its nice to know the basic checks so I can let him know, before he comes round. Thanks for your advise.
You are amazing! Wish there were more professionals like you in the business! Thank you for sharing your knowledge!
Yes I stumbled across this. Excellent Vid Thank you
No worries! Still making videos today, plus you can follow me on Instagram here: www.plumberparts.co.uk/social.php?social=Instagram FANKS!
Excellent video. Videos like this educate people so that when they get a tradesman in they are more clued up and far less likely to get told a load of rubbish.
Excellent explanation and I think you have give me the answer I required. New pressure vessel required. Thank you sir
Hi there been watching a few of your video's, wondering if you could guide me in the right direction? my boiler cut out due to the pressure dropping over a leaking radiator and we have had the heating on, the problem is.....I can't get water back into the system, turn on the filling and nothing is happening, no flow of water for some reason, I've bled the radiators, any help would be appreciated Thanks.
Why so many hates? A quarter of a million views means that a lot of plumbers have probably lost a lot of money, but the sad fact is that a lot of plumbers aren't great at fault finding. I have been out to jobs where they have had three or four plumbers in and none of them have noticed that the pump has been fitted the wrong way round or something equally simple.
Yeah, I'm sure it's grumpy plumbers! Hey I'm a plumber so I know how grumpy we get!
Plumbers didnt lose a penny from this as THEY CANT LOSE MONEY THAT WAS NEVER GOING TO THEM! see how money loss works now.
A little knowledge can be dangerous, I could roll off 101 reasons why the general public should not follow out just some of the simple task in this video such as he recommends turning the pump speed down with no future content as what else could go wrong following that simple action like leading to the boiler overheating and in extreme cases split the heat exchanger, then your in a world of pain an see how you saved money by not calling a professional🙀
Don't get myself? It's a helpful video
@@plumberparts You mate are very Honest Plumber, good on you.
Hold Tight !! Brilliant video as always. You deserve a medal mate. Subscribed.
Brilliant. This will enable me to speak to my plumber much more intelligently! Thanks!
Great Channel. I always come here for good honest advice. well done mate. keep the good work up.
Another point - the PRV can develope a leaking seat, as it is contact with acidic/particle/general muck from the primary boiler water. This can be especially prevalent where the PRV has actuated due to over-pressure. When the pressure has reduced and the valve closes again, bits of grit are left on the valve seat which can fail to seal properly leading to a permanent dribble.
Great video, never thought about the pump being set too fast but that makes sense. Thanks.
Not a plumber just someone that has to frequently top up the filling loop. Two plumbers have attempted to fix / replace expansion vessel. Thank you for your thorough explanation.
Looking forward to testing the Expansion vessel and PRV tonight! Great video, love the way you explain the system, makes it so clear.
Cheers
No worries, thanks Nick!
When Bradley Cooper’s brother fixes your boiler
Lol
Bradley Walsh
Funny as hell
Who’s Bradley Cooper
@@nimmichagger165 deffo Bradley’s son 😅
I have been a breakdown engineer for 40+ years and a friend has a flat in london and was being conned . instead of writing out all of the possible reasons for constantly topping up the system i pointed her to this video...very good... i might look at your other videos now...lol
Great, informative video. Thanks for sparing your time to share.
Once a Pressure Relief Valve has been forced open (perhaps by a faulty expansion vessel) they frequently start leaking or opening at a lower pressure. So if you have a faulty expansion vessel that causes the PRV to open consider replacing the PRV at the same time. Not always necessary but they aren't very expensive and might save you another drive to the plumbers merchant.
BANG ON
That is very good advice.
"Stumbled across" this video! One minute and some change in and I am wondering if I will finish it... very engaging host but at this point I'm questioning my entire life!
play the vid at 75% speed---much more absorbable.
Good to find somebody who sticks to the point and not waffling on about nothing, well done, good vidio
Very informative, great presentation style. Keep up the good work.
Great info on the central heating system.The plumber finished with his girlfriend this weekend, he said; "it's over Flo"
Awesome
Only 9/10 as it needed to be a bit shitter
Nice presentation and good advice. Worth pointing out though that the expansion vessel air pressure (1 to 1.2 Bar) is normally quoted for COLD condition. It shouldn't be pumped up and the pressure measured when the water is hot.
Hi
My boiler pressure is just above bar 1 in the mornings and when boiler is on it goes up to just under bar 2 range.
Could you please advice is this normal.
Thank you.
Great video and lots of ideas for tracking down problems. I'll speak with my plumber and make some suggestions!
I have spent all day trying to fix this, online, phoning plumbers, getting baffled. I thought a picture of the valves might help, so spent more time online - then - I happened on this. IT IS BRILLIANT, a simple demo was all I needed. Thankyou ( one cold shower was quite enough)
Thank you this was so helpful, living on my own after 23 years of marriage, starting to get the hang of things 😄
👍👍👍👍👍
Ask Plumberparts to pop round and give you a good servicing causing his pressure release valve to explode. That would get ten million views and you'd both walk away as millionaires.
I will pop round lin and fix it no probs
@@johnvonhorn2942 loooool
Good one "Hose Mourinho".
I have completed a check of all my radiators, no sign of leakage and removed cover on the boiler, no apparent leaks and looking very dry. The pressure is dropping and radiators appear to be outputing more heat than is indicated on the digital reading on the boiler. Do you think it could be PRV or is something else going on.
Thanks for posting this excellent and say hello to "Mr.G"
Greetings from Glasgow
You are a brilliant person, very nice any person with little experience of plumbing will love you mate have a nice day.
Very simple precise instruction, thank you
Explains it so clearly even I can understand it ! I had a new Combi installed 3 months ago & I’ve had to top it every couple of weeks - CH Engineer said it would settle - it hasn’t . Ive now good a good idea of what the problem is as overflow pipe outside is constantly dripping & so rather than feeling the Engineer is speaking to me in a foreign language I can have a more informed conversation with him - & that’s why the 3m dislikes as the old school cast iron boilers with a life span of 20 /30 years with occasional repairs have been replaced by boilers with umpteen plastic components, built in obsolescence & the creation of a whole new £££m industry to teach & test Heating Engineers who then go on to charge £££ to install , service & repair the dam things. They might be more efficient but I reckon these additional costs more than outweigh any savings on my gas bill
We moved in to a brand new built house and for 16 years we had pressure drops in the heating .we had all the floors lifted multiple times looking for a leak but not could be found .the pressure drops always seemed random more in the winter and less in the summer ,in the end we just kept topping it up with the housing association permission about once or twice a month. At the beginning of Dec 2021 the pressure started dropping twice or more a day.however this time i could see and hear something not right in the kitchen steam was coming out from just under the boiler
where the pipes where .on investigation i found a leak where the condensation pipe was touching the heating return pipe the acidity in the water had caused a small leak and water was squirting out it was very hard to see at first as the condensation pipe was covering the leak and was dripping from the pipe lower down .when i moved the condensation pipe the leak was obvious and the pipe had corroded to the point a pin hole leak could be seen this was obviously a job for the plumper who would not be able to get out this the morning .it was very cold and we needed the heating on over night and being a ex Rn marine engineer i decided to put a patch on it with some rubber and a pair of hose clips. this in when i noticed that as i manoeuvred the rubber and hose clamps and the pipe moved water would also squirt out of the elbow joint connected to the pipe, if i stopped putting a slight strain on the pipe the squirt stopped even though the system was pressurised .in the morning the plumber came out and spent most of the morning replacing the pipe that had corroded and i had mentioned to him about the elbow joint and that i though this was the cause of the pressure leaks we had lived with so long .after he had removed the pipes and fitted the new ones i noticed on inspection of the joint that they was NO solder around the back side of the pipe and they was a clear gap between the two components/joint and looked like it had been soldered by a monkey. they had been no evidence of a leak at this joint before hand and i suspect the very very small leak and the water that had come out had evaporated on the hot pipe condensed on the condensation pipe the before causing any noticeable damage and eventually rotted the return pipe e you would expect from a leak,coupled with the fact the very small place the pipes where located where under the kitchen units and where the pipes came from under the floor part of the floor was missing to allow the pipes to come up so any water damage was beneath where you could see without removing the units and floor.since the repair our pressure has not dropped once.bad plumbing is a nightmare to figure out especially when the joints are hard to see one tip i could give is wrap newspaper round any joint you suspect as when it gets wet it is easy to see the effect on the newspaper (trick i learned from my dad)
Very clear and comprehensive. Thank you.
Simply....THANK YOU SO MUCH BRO
Unlike your other excellent videos, this lecture seems to aim the already experts. This is a very fast lecture that flies over the head of 90% of the people who come to find a step-by-step procedures of fixing things in a very clear and brief presentation. Choose one or two kinds of popular boilers and show us doing it. People come to youtube to "see" not to hear. Otherwise, you are very knowledgeable and helpful. Please keep on helping.
Hi Merid. Thanks for your comments and I hope you continue to keep watching! I would like to draw your attention to the pause button! All the best PP!
Excellent video. Thank you so much. My boiler keeps losing pressure and I'm having to top up everyday. Any idea what could be wrong?
Err the answer is in the video you just watched..
Superb, very informative. Now to find my pressure relief valve!
Brilliant ,as a heating engineer i did not learn any thing from this video
, but most of the plumbers I know would,
lovely one pp,you've got good infomat've video's that's why you're getting the jealous plumbers disliking the vids
+amir hussain Yeah, cheers Amir!
My neighbor recommended me for her friend, because she had a problem of her gas boiler mysteriously loosing pressure. On Sunday I will go there and check, maybe I will be able to fix it. Gosh, I haven't had many chances to work on heating systems, except in my own house, witch has become now sorta like my own learning grounds. Well, if there is a simple leak on system, or if there is simply bad vessel of Relief vale, I might as well get lucky. I'm learning everyday. I'm surprised that a middle aged woman is confident in 19 yo self thought plumber wannabe, in fixing her boiler. This video is going to be my guide. thanks a lot James.
Very helpful and informative. Thanks.
The main reason for removing the filling loop, is to prevent the contaminated water in the system getting back into the cold water mains supply.
In Canada there’s a backflow prevention device on the fill.
@@danlux4954 and in the UK
The cavitation does not produce hydrogen, but just steam. During cavitation the water is simply boiling at room temperature because of the low pressure.
inkwhir correct and depending on the rate of cavitation it might sound like your heating system is circulating tiny marbles...
Thank you for your videos, you've helped me so much over the years and saved me a lot of dough.
This is really helpful, thank you!
Isn't the braided hose is removed to prevent mains water contamination.
+denis moloney Well kinda. Mains water can't 'contaminate' as such, but it can over-pressurise the boiler water if the mains valves start to let by. PP!
+plumberparts No, but the heating system water can contaminate the mains water if the check valve is faulty, that's why the bye laws say you have to remove the loop. I'm a plumber and Ithought this vid was pretty good, don't understand the dislikes either.
Yes, it is a water bylaw but ignored by many forign boiler manufacturers, Worcester Bosch mostly use a removable key (bridge) to comply with the regulations.
It creates an “air gap”. So that if the check valve fails then heating water can’t contaminate the mains if there were to be any loss in pressure to the mains... doesn’t happen often but it does happen. If a water main was to burst for an example there would be a sudden loss of pressure on the incoming main.
Plumbers and Gas Engineers are two different areas of work
Very informative and straight to the point 👍🏻
I like your video. It is the most comprehensive video regarding this problem I have seen. The only problem is you cover many topics whilst speaking really quickly, not giving the viewer time to comprehend the issues
For example, you show the rusty nails and talk about hydrogen in the system. I don't think many viewers would have a good understanding of chemistry to understand that corrosion is the source of the hydrogen gas.
I know viewers are put off by long videos, but they are also put off when they are overloaded with information they don't have time to understand.
I know they can pause the videos but in reality they don't.
I've searched Google for hours and can't find an answer, my boiler loses pressure over a couple of weeks, but ONLY when the heating is on.
If the heating is turned off, the presuure doesn't drop. I presume this rules out the PRV and expansion vessel?
TIA
It is almost certainly your boiler PRV or expansion vessel then.
It's a Logic+ 30, it's now happening a couple of times a day. Isn't there a known fault with the logics and the error "Low flow lockout". All of the thermistors have been changed.
Cleethorpes Kid
You really need to get it sorted sooner rather than later. Every time you top it up , you introduce fresh oxygen into the system and you will rot out your rads prematurely.
Sorry, I misread the error message when I originally posted 3 weeks ago, It's not losing pressure therefore I'm not topping it up. It keeps switching off with the error message "Low water flow lockout". If I reset the boiler it starts working again.
That sounds like a blockage, some boilers will have a software lockout if there is an excessive temperature rise across the heat exchanger, this is due to poor water flow rate. The software is trying to protect the heat exchanger and let you know you have a problem before you lose the heat exchanger all together, then it gets expensive. If you are not loosing water you might have to chemically clean the water side of the heat exchanger, but that's not really a DIY job, you need to know what you are doing.
Interesting, the gas fitter who services my boiler told me to leave the filling loop connected, previously I was removing it.
Well most say don't just in case the fill valves start to let by.
If you have a flexible loop, it's best to leave it disconnected, but a lot of boilers nowadays, don't have a flexible loop. They have a permanent connection, where you have to open two valves to let the water in.
Thx, I have a flexible loop, next time I pressure it I ill remove it.
During my courses there were a few reasons why you have to disconnect one is you could potentially contaminate mains water supply and the other was as mentioned if the valves let by and over pressurised the system. I've been on a visit where this has happens and it cracked the heat exchanger. Not cheap to replace.
plumberparts Quick question could you get an airlock in an unvented system the same way a gravity system gets theirs? We have an issue on one of my site where we have checked absolutely everything and even added another expansion vessel on the system and changed the AAV but the systems still losing pressure.
Excellent video,plain speaking and very informative.No "dislike"from me.
Excellent overview - many thanks!
My head expansion is about to happen 😨
Why has this got so many dislikes?! :)
+plumberparts Not sure. This is good quality stuff.
+billiepipersteeth Weird isn't it? I think most people just want to solve the symptom, rather than just dealing with the actual cause!
+plumberparts it must be professional plumbers building a resentments against you for giving away trade secrets. 😉 I on the other hand salute you sir!
+dieselbiggins Ha! thanks dude!
+Robert Granger Cheers Robert!
What a great video so much info very informative and helpful 👍🏼
Thank you soooo much! Thats saved us a bob or two! We had a filter installed as recommended but the guy hadn't tightened up one of the nuts quite enough and was trickling water out!! Tightened it up and Bob's yer uncle! Sorted!!
Too much detail for head to take in.
b1h2u3p4 then you'll always need a plumber until you understand. I thought it was great and very understandable
Sorry, there's no way cavitation makes hydrogen and oxygen... cavitation is making little bubbles of (just about) vacuum with a little bit of water vapour in that collapse almost immediately and can damage the impeller in the pump.
Can you read what you post before you post it! I don't understand the sentence...
Matthew Lowy well done ! Cavitation also applies to Ship's Propellors (includes small boats) and causes damage to propellors under water ! I am an ex Ship's Officer.
Good on you dear boy! My bro's in the RAF.
It also affects the pcb
Actually, it does. The cavitation is not just boiling of the water to create pockets of "air" (It's a combination of water vapour and dissolved air) - the bubbles are low pressure but they are most certainly NOT a vacuum. The physics of the situation dictates the water can break down into hydrogen and oxygen because in addition to the mechanical motion and heating there is also an electrical flow in progress. The multiple types of metal in the system ensure an electron flow. So yes, the pump is one of the places where water is split into hydrogen and oxygen. The popping you may hear in radiator is sometimes the two gasses recombining into water, but the amount of free oxygen is often less than the hydrogen because the oxygen binds to the corrosion inhibitors in the system or sometimes the chlorine in the water (molecular compound, not ionic). This leaves more free hydrogen to vent. Most of the gas coming out of the system when bleeding is just normal "air" that was dissolved in the water, but it has a higher concentration of hydrogen than the atmosphere. Cavitation damage to props and impellers is largely shock damage when the bubbles collapse. There are several videos on YT which explain how the bubbles are created using cavitation by snapping shrimp. Have you listened the din on hydrophones? - those shrimp a really loud!
I'm no ship's officer (catering?), but I do my own plumbing, electrical work, electronics repair, and systems design for reactive systems such as fuel flow in aircraft engines . I also have degrees in Computational Engineering and Physics (lots of free time after breaking my back at the age of 24, many moons ago.) Plumbers get annoyed that I do all my own work, but I do respect their advice when I ask them to come and check my work; something I always do after finishing.
Great information and just what I was looking for. Thanks.
Excellent informative video. Just what I was looking for. Thank you for sharing you valuable knowledge.
No worries Nodrog! Love the name!
Please talk a lot more SLOWLY so we can keep up and understand. Thank you. I have had to watch this about five times to be able to understand at this speed.
Think quicker. It was fine, in fact excellent , a welcome no nonsense delivery. The worse videos are where where you have to constantly keep fast forwarding because they are so slow at getting to the point. Like I said, think quicker :)
You can turn down the speed of the video in the settings at the bottom.
it's very difficult to compress water. no it's f****** impossible
HAHA! you ain't wrong bro! Please consider subscribing - Uploading still today!
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Very good useful video. Explains clearly exactly what to check and how. Will certainly try this and see if I can find the problem.
Excellent video ,thank you James.
Excellent I guess you are the man .. well done easy to follow presentation and nice clear voice. I had a slow, real slow, loss of pressure in the ch system with combi boiler .. there was some sign of discolouration in the wall and I sealed the outside patio believing it was leaking into the wall from the outside veranda. After watching your video and checking all of the connections I have decided there must be a very small leak inside the wall. so next step is the hammer and chisel ./. thank you so much for your input and support.
Very helpful clear and concise as ever - thanks very much
Thank you, very helpful.
Good man I'm a heating engineer of 30 years and you are a pleasure to listen too.
Do you live near the Middlesex area?
I cannot understand why this video has so many dislikes, I have read numerous forum posts about pressure drops on boilers and none of them are as comprehensive as this video. This video fully explained to me the various reasons for pressure drop and the cut away expansion vessel was great. Loved the video . Thanks
I honestly don't get it either. It's probably tossers! SUBSCRIBE! ➡️👉 ruclips.net/user/plumberparts 👈⬅️if you haven't already!
Great little video thanks it’s helped me diagnose my fault cheers guys
Thank you sooooo much. My heating is now working. I didn’t realise one of my radiator was leaking after trying to bleed it yesterday.
Cracking video that; really well explained and easy to understand. Great job 👍
Very useful information,thanks for sharing your knowledge much appreciated
Factual and informative - thanks
Top man.Great advice.Many thanks.
Excellent as usual for Plumberparts.
Thanks mate, always love your videos
Absolutely fantastic and excellent video very valuable information. Thanks for uploading this video.
Thanks, I was always told by the plumbers who came out to us that we had a water leak in the pipes in the ground, after this video I can see it the Pressure relief valve as from day one we have had water running out the back of the boiler. Will look at tank also thanks.
honest and true explanations, good guy
Thanks very much! SUBSCRIBE! ➡️👉 ruclips.net/user/plumberparts 👈⬅️ IF YOU HAVEN'T ALREADY! 😎
Reply ·
Very good quite well explained will look you up more often
awesome, and I had a failed pressure relief valve exactly as he said. Went outside, found the vent pipe, and viola leaking. Big thanks!
No worries Dennis! Glad to help you out mate. Get that PRV changed! SUBSCRIBE! ➡️👉 ruclips.net/user/plumberparts 👈⬅️ IF YOU HAVEN'T ALREADY! 😎
Happiest plumber I’ve ever seen.
An absoluteluy brilliant video sir.
Many thanks. I have learnt loads. Thanks again.
Fantastic mate, thank you for the footage 😉👊♥️🇬🇧
Excellent useful, video. Thank you.
Very clear and informative