How to tell if your home thermostat is bad
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- Опубликовано: 5 фев 2025
- Thermostat not working Honeywell thermostat troubleshooting. How to test a home thermostat for problems if AC or Furnace not turning on. Bypass thermostat with a jumper wire to jump-start your system.
Disclaimer: I'm not a professional technician, just sharing my personal experience and if you find my video useful, please be careful and perform all repairs at your own risk. Thank you.
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Thank you for the GREAT INFO! i just paid $110 to an hvac guy who said your thermostat doesn't work. He did nothing to fix it. I jumped on YT saw your explanation about the batteries and the C port, put in new batteries and fixed the problem! I wish I had seen your video 1 day before. Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Too bad the HVAC tech couldn't tell you to change the batteries, but I'm glad you fixed it yourself!
If that AC guy told you just to change the battery, he couldn't make $110.
@@Your-SelfI had a HVAC guy come over last New Year’s Eve, of course Time & 1/2. Told him it’s not lighting up. He walked in and asked if I had batteries. Gave him batteries, presto Heat, $200 . Then left and he could have told me over the phone. Thanks for your video. I live in ND.
82°!
As soon as you said that my father raised up out of his grave screaming , "who touched the thermostat, I told you not to touch the thermostat, what're we rich all of a sudden now!?", reset the thermostat down to 67° & stumbled back to the graveyard mumbling about " kids these days"!
Thanks so much! I used a paper clip wrapped in electrical tape as you suggested and determined that my HVAC system works fine and the thermostat is dead. I'll replace the thermostat myself. You saved me an expensive service trip!
Glad it helped!
My son and I used this to troubleshoot my wireless thermostat, I saved hundreds of dollars thank you!!!
Good to hear it, and thanks for watching!
Omgosh it worked. My ac turned back on. I now know it’s the cover and not the unit. It still just gives me the inside temp and not the setting temp. I was a little worried it now won’t turn off. I don’t want it constantly running. But it did shut off at 76*. I can do that till my new cover comes. 😊 Thank you! Your channel was the only one I found that really helped me out.
Good to hear it!
you are the only video I found so far that mentioned that the front of the thermostat may just be bad. I have a blank front case but power comes through back plate.
Dude, you wont beleive this but ac wasnt working upstairs and had a blank face thermostat. I had checked several things and was almost convinced that it wasnt a thermostat problem. It's 11 pm on a Friday night so I'm pretty bummed about the problem. Saw your video and skeptically tried your idea. I created my own jumps start wire with electrical tape and a paper clip. Connected the R and G and a few seconds later the AC kicked on! So hoping just replacing the thermostat in the morning should solve the problem. Thank you for this video!
This was so helpful in revealing that our thermostat was indeed working right. We ended up after a couple videos like this saving a lot of $$$ on a big costly repair by having a better idea what was wrong with our HVAC. It ended up being a blower motor. We are very grateful. Still a big repair but saved a ton. Thank you.
Glad it was helpful!
Thank you for showing how to easily change batteries.
Vrey goos welxome shwring gues all thanktou gues all frineds wwlcome ....
Thank you so much! You turned a miserable day of troubleshooting into a quick fix! Thanks again!
Glad I could help, and thanks for watching!
Thank you for the video, we bypassed troubleshooting and just changed thermostat and AC started working !!!
Great job!
I have that same thermostat Honeywell and my unit was not getting cold barely blowing , I looked up videos and found u first, I listen than I changed my batteries 🪫 now my house is cooling good. Thanks 🙏🏾
Glad I could help
This video was the absolute BEST! if it was my thermostat that was causing my a/c to not work, Id be very bummed paying some electrician couple hundred dollars to change my thermostat. This video provided all the info I needed. Brilliant suggesting just trying the fan cause I have one of those programmable units that takes a degree to figure whether the problem is the unit or my inability to get the "wake, daytime, night, start, finish, Mon-Sun" all or even partially correct. Noting 24 volt shock is nothing helped, so you do not have to figure where the hell on your fuse box is the thermostat breaker. The paperclip tool is ingenious, and lastly suggesting buying the same unit (I didn't want the program nonsense), but to skip all the rewiring was a tip I couldn't turn down. THX!!!
Glad you found the video helpful, and thanks for the detailed comment :)
Thank you much. Cant believe this worked.
I had just recently gotten my AC replaced. With a one year old used one and kept the same 1855 thermostat in my old house. I took off the cover and it did not work. Went to panel on the unit and tried again. This time it worked. So after looking around a bit more I looked into my drain line since they installed a overflow kill switch. My drain outside had gotten clogged up. Unclogged it and turned on right away. Thank you for this video.👍👍👍👍👍👍👍👍
Good detective work! Thanks for watching.
Outstanding -- solved my problem in the first 10 seconds. The rest of the video was very informative and invaluable. Thank You,
Kudos to you!!!
Thanks for watching!
Thank you very much for teaching us to know if it is the thermostat that is bad or if it is another problem with the system.
Glad it helped!
ordered a new thermostat today bc of this video, thank you my man
Thanks for watching!
Thank you, this is SO helpful! Just had our furnace serviced twice in four months and now I think it's a bad thermostat.
Also, love the Swedish accent!!! 💜
Great to hear it, and thanks for watching!
My suspicions were correct and your quick test confirmed it. Thank you.
Great to hear!
My thermostat, does not turn off the system at all. It was on for few hours, I turn the fan from auto to on and if finally stopped blowing cold air. Everything that you say was very helpful. Thank you.
Thanks for watching!
A really great video that made a potentially complicated problem very easy to resolve!
Thanks
Glad it helped!
Another very well done video. I now know so much more about that thermostat. Thank you. Thumbs up!
Glad it was helpful!
Omg thank you for ur video!!!! Saved me a lot of trouble!!!! 🙏🏽🙏🏽🙏🏽
I'm so glad!
Thank you! This video helped me figure out the problem and fix it in minutes.
Great to hear!
Very helpful. You make it easy to understand
Glad to hear that!
The fan comes on but the rest of the thermostat will not work. We replaced the thermostat and used wire strippers to expose a fresh set of wires. Even with the new thermostat, the fan comes on but the rest of the thermostat will not work. Do you know what the issue could be? Thanks for sharing!
I am very happy that I found the problem and solved it thanks to your video!
Good to hear it!
This worked, wire to R and G and the fan turned on. Bad thermostat. Going to buy a new one. Thank you!
Great, thanks for watching!
@Alam Vai typically, R - power, G - fan, C - common, W - heat, Y - cooling
Agreed!
Thank you very much for your video. For the cooling setting, my ac system keeps running and cannot be turned-off. What cause these problem?
If your AC keeps blowing air and actually is cooling, the condenser contactor could be stuck closed (welded). Research AC CONTACTOR.
thanks so much, now I have to replace my thermostat :). Subscribed!
Good to hear it!
Fantastic! Thanks 😁. And I love your voice 💜
Thank you too!
Thanks‼️used the jumper wire replaced the thermostat back in business
Nice work!
75 thumbs down came from the electricians loosing money because of this awesome video!
LOL, thanks for watching!
That was funny
...As an electrican I'm this is all hvac guys stuff
@@Your-Self in
I really appreciate For the video, saved me a lot of money, god bless you.
Glad it helped
If we have the same issue as this video what can be the problem. I replaced the thermostat and still nothing turns on. I tried junping it from the thermostat and nothing. Not getting 24v to thermostat. I jump it from the main board and it works fine only.
Possibly a broken low-voltage wire inside the wall.
When you remove the thermostat, you should have a spare wire twisted behind it.
You could try installing that wire instead of the red wire on terminal R. And install the same wire color on the main board on terminal R as well.
If that doesn't work, you may need to feed a brand-new wire cable through the wall... not fun.
@@Your-Self you were right. It was the thermostat wires. Ran a new one and worked fine after I did the connections. Thanks
Great video. Question: I put in fresh batteries. But the heat furnace does not go on when Thermostat is on "Auto" and I up the temp above room temp. But when I put Thermostat on 'Manual Fan", the fan turns on. But it only circulates air, not heated air. Do you think it's my Thermostat or the furnace?
Ok
My exact issue
Will the paperclip trick work even if my thermostat screen isn't working even with new batteries
With a paperclip. you are bypassing the thermostat. So the AC should work. If it doesn't, you may have some other issue besides the thermostat.
I have one wire going to rc and no c wire connected. How do i proceed instead.
My issue is it kept turning back on with or without the face of thermostat without staying off.
Why does the temperature keep dropping even with the heat running?
Ok thanks i changed it out but sometimes it goes off and comes right back on
What does it mean if the "set to" temp and "heat on" is crazily blinking? It doesn't do that when it's over on cool..? It's a weird blinking and the "set to" temp is also blinking the temp up and down by a degree or two. It does take batteries, but there were no batteries when we bought the home a year and half ago. It's hardwired. Can you help? Is it the thermostat or something else? Thank you!
I have a Honeywell RLV430 for an electric baseboard heater in my bathroom. It says 32 deg but backwards on the screen. Doesn’t take batteries, tried everything but it just won’t come on. Starting to think my thermostat is bad. Any suggestions. Also will not reset
@YourSelf I have experienced some Honeywell thermostats which partially works and doesn't! Some will work only in the cooling section know as the RC. RC will make contact with both G (Fan) and Y (compressor) not in the heat mode between R & W for heat Or Vice versa!
thank you for making and sharing this video! it's extremely helpful!
Glad it was helpful!
But what happens after clicking hold and everything looks fine but it decides to go back. Like I want mine to be at 70 and I do as you instruct but after a few seconds, it goes back to 84. And it keeps climbing up. Help?
Great Job,but I changed the battery of thermostat but it still blank no works.
Thank you for your video. You have mention about C terminal and batteries.
Question 1: Without batteries, I wouldn't able to see the temperature numbers. Is it a good idea for everyone?
Question 2: With the batteries and C terminal, can I have both of these items?
You need either batteries or the C terminal connected for the thermostat to work at all. But it's best to have both in case of a power failure, so you don't lose your programmable thermostat settings.
Thanks for the great video! Question for u. Our thermostat Keeps turning the fan on and off as we usually keep it on auto. The furnace downstairs seems to be working as we are able to turn the heat on/off however the fan keeps turning on then a few mins later back off. We put new batteries that doesn't seem to be the issue. We removed the thermostat off the wall completely and it is still clicking itself on and off. Is that a thermostat issue or a wire issue?
If you have a single thermostat and removed it completely from the wall, this could be a wiring problem or computer board in your Furnace/Air Handler problem.
If you removed just the face plate from the thermostat, the problem could be with the back plate.
You're amazing
Life saver
Thank you ❤️ 👍👍👍
Glad it helped!
Our furnace wasn’t coming on. Thermostat had no led readings on it, pulled the cover off and replaced aaa batteries. Still no led readings so removed batteries and they were very hot! Not sure if thermostat needs to be replaced, any thoughts?
Did you put batteries in with the correct polarity?
I'd take the cover off again and experiment with batteries. The LED screen should light up in your hands, even before you put it back on the wall. If the LED is dead, try other batteries. Otherwise, the thermostat is bad.
Best video ever.
Glad it was helpful!
Great explanation
Thanks for watching!
Can i jump start if i dont have c hooked up
Mr. YourSelf: Thank you very much for your great videos! can you please make short video on outdoor unit short cycles reasons?. Thanks
Here are a few reasons that the outdoor condenser unit is short cycling:
Weak batteries in the Thermostat.
Loose wires at the Thermostat, Air-Handler/Furnace, or Condenser.
Clogged air filter or the outdoor condenser unit.
The Contactor going bad.
The Capacitor going bad.
The outdoor Fan going bad.
The Over-Flow Switch is full of condensate water and tripping.
Refrigerant leak, low Freon, iced up tubes, clogged metering device, bad compressor... the last line is a major problem for which you need to call a tech.
Thanks for your help. I have a single pole thermostat going to wall heater. I have replaced the thermostat two weeks ago and now it will not operate the heater. If I remove thermostat and cross wires the furnace kicks on so nothing wrong with furnace. This is the second time I've replaced the thermostat in 2 years. Do you know what I'm doig wrong? Thanks in advance.
9:39 Why did the temperature go from 72 degrees to 74 degrees in less than 1 second?
Mine was the clicking noise from the reverse valve. Honeywell is doesn't like colmens hvac.
I have a white and black wire thst came off my thermostat and none of them is connected to C. I have a pro 1 t-701. Could you please help?
If it says Honeywell on it, it’s bad.
This
Yep
😂
Is it safe switching to on.
This was very helpful
Thanks for watching!
I definitely agree these are safe ways of testing a thermostat but honestly I would change batteries 1st if no change then I'd buy a cheap $15 dollar thermostat and see if it makes a difference because having a back up never hurts. But all this does is remove the thermostat from being a problem most of the time it's a broken or loose wire, blown fuse, or another cheap easy to fix part the expensive part of heating and cooling always comes down to labor cost and usually doubled hourly rate for emergency calls
Thanks for sharing.
Mine I set it up to a temperature say 73
Once it's reached the temperature instead of stopping it blows cold air.
What can it be
Nice explanation! Thanks
Thanks for watching!
This helped me a lot. Thank you
Glad to hear it!
Hello where can i fine that exact thermostat please
I have an issue where my cooling tower constantly runs. A service tech said it could be the thermostat, but did not sound certain. What would your thoughts be?
I'm not sure exactly what your referring to with cooling towers I've never Hurd of a residential cooling tower there usually part of some kinda industrial application like nuclear power plants and all a thermostat does is control the power on and off when a set temperature is called for
My thermostat is blowing out heat , instead of cool air ... yes I put it on cool , auto or cool ,on .. I need help
Same here!
Our cool air sometimes is not cool.its like the thermostat doesnt dire up a spark to start the cool air..had unit cked dirst week in June..all is well outside unit..but they did not ck thermostat..if we turn it off wait 10 minsnthen turn it on..it starts up..put in new batteries..help!
My fan will not run when i put it on auto bit it works if i switch it to on. Would that be thermostat causing this?
I'm not sure, but yes, the thermostat could be failing.
@Your-Self i swapped out the sequencer and it didn't fix the problem. Then I swapped the thermostat and that fixed the issue!
How do I change from Celsius to Fahrenheit it’s stuck idk how to go back
I think I missed something. I have an upstairs thermostat that doesn't work but my downstairs works fine. I tried the steps and nothing is happening. I need help 😫
What a blessing... this video!
Glad it was helpful!
Thanks man! This worked for me
Great to hear!
When I press the arrow, nothing happens anymore. Only when I hit "set" I can change temps. Also it's ignoring any set temps and is cooling for hours without stopping.
What if your heater won't shut off when it reaches the ste temperature? Mine stopped shutting off yesterday. Therm8is really old, so I'm assuming that's the problem, but idk.
Thermostat***
If you don't see any uninsulated wires inside the thermostat touching each other, and you didn't drill any screws into the wall yesterday, the thermostat is probably bad.
@@Your-Self Thanks.
Now that was good. I'd never do it, but it was good!
Thanks for watching!
So I have the exact same unit and I set mine to 77, my air has been running for 40min now and it’s been 77 almost the whole time and it won’t shut off
Mine is hooked into RC and small jumper to R. The thermostat just stays at the same temp no matter heat or ac with new unit can I still jump R to G in order to test or do I need to remove the jumper between Rc and R?
The R and Rc are the central point of power for both Heating and Cooling.
So they have to be jumpered together and, essentially, is the same thing. Use either one to connect to the G terminal.
However, if the unit is new, maybe it's not connected correctly at the thermostat or the Air Handler/Furnace?
We have the same Honeywell thermostat, ours only show inside temp, nothing else and it doesn't respond to any button presses anymore. We checked the breaker but that's not the issue.
Do you turn the power off from down in the basement
For this test, the power should be ON.
@@Your-Self what does it mean when the thermostat will not power on unless batteries are installed.
If your C terminal is connected but the thermostat has no power, check/reset the breaker.
Next, the overflow-switch could be triggered in your Air Handler (furnace). Make sure the condensation water goes down the drain easily.
Maybe the small fuse is blown. But in this case, it's best to call a tech to look for a short.
@@Your-Self 🙏🏽 a lot
Turned my AC off but will still blow. Turn it to heat and clicks but no heat just cool air. Also seems like it never cuts off no matter what it’s set to. Any idea?
Mine is doing the same thing did you ever find out what was wrong?
@@sheylazamora1654not yet. I’m trying to test to see if it’s the thermostat tonight. Might just change it to see if that helps
@@jordanyoung2701 someone came to check my ac today and said I need to replace the whole part where the fan is at inside. We are getting a second opinion tomorrow.
@ I hope it’s something simpler than that for you. That sounds expensive.
Thanks for sharing that tip! . Bad at trouble shooting skills on my side
Thanks for watching!
Very good video
Thanks for watching!
When I turn on cold the inside temp appears on left side of thermostat and nothing happens. I turn on heat and heat works. Why no cold?
(Not an expert) make sure there is a jumper between R and Rc.
I have a green wire in W and a red wire in Rc... I've had an electrician come out and fix it but its usually stopped working after about a week.
Mine is blowing. Air just isnt getting hot. Cold as hell in this house. The pilot is lit and filter is changed. Played with the breaker, reset the thermostats. What could it be?!
My problem is my thermostat is directly across from my inside unit I also have the outside AC fan but the problem is when I plug in the unit across from the thermostat it stays on whether or not I flip switches off on the thermostat how do I fix that
But what if there is no C wire connected? And I take the front part with the batteries off?
The C wire is not necessary as long as you have good batteries installed. And for testing purposes, we don't use the C terminal.
What if the fan blows. But no cool or heat & temperature never changes. Would it be the thermostat? The thermostat is over 10 yrs old
If the thermostat is activating the fan, that means it's doing its job. So the problem is probably elsewhere. You may want to call a tech to investigate.
So if I turn on my fan and the air turns on what does that mean
I tried everything you said, and still no heat. But, then again, I haven't paid the gas bill in months.
lol
Hello. My A/C works fine, however, when the set temperature is reached, the compressor and fan don't turn off together. Only the compressor turns off, and the fan blows continuously, and I have it set to AUTO. When the temperature goes back up again, the compressor turns on. But fan is running 24/7. Could this be a thermostat to relay issue?
The thermostat switch from AUTO to ON could be stuck internally, so the thermostat needs to be replaced (try wiggling the switch back in forth vigorously to unstick it first).
Or it could be a wiring issue. If the wire from the G terminal is touching the wire from the R terminal, the fan will continuously run. These wires without the insulation could touch inside the thermostat, inside the wall, or inside the Air-handler/Furnace.
My problem is that I just replaced the batteries 2 weeks ago and now the thermostat is already dead again. Is it safe to assume the thermostat just has excessive power draw and needs to be replaced? Or might there be some other issue?
Have you tried freshly-bought batteries from the store? Could be old-stock batteries.
Also, the rechargeable batteries don't work well. You need regular Alkaline.
Were the batteries too easy to remove from the thermostat? Maybe the terminals are too loose and need to be adjusted to make them tight.
@@Your-Self I'll check the terminals but i don't believe it's that. It was a fresh pack of batteries too. I appreciate the response.
What if the thumastat says change the ball ?
Good video helped me troubleshoot down to what the cause of my problem was. It was a 15 amp fuse on my furnace on and off switch it was blown.
Glad it was helpful, and thanks for watching!
Thank u so much!
My thermostat runs the fan on furnace but outdoor ac unit won't switch on,already replaced capacitor,any help out there,Thanks in advance!(also has jumper already installed) new batteries in thermostat also
Weak batteries may not be able to close the Contactor outside.
A bug or an insect could be squashed inside the Contactor, so it can't make a good connection.
One or both thin wires running from the house to the AC condenser outside could be cut, chewed, or loose.
Tripped high voltage breaker.
Is the compressor running, humming, but the fan doesn't, or totally quiet in the outdoor unit?
Did it ever work before, or you just moved in and don't know the history?
And what jumper are you talking about, R to Rc?
@@Your-Self it worked last summer fine, so I put in a new capacitor still nothing but when I depressed the plunger on the contactor by hand the AC unit turns on but the contactor won't pull in when I use my thermostat in the house to start the AC there were no bugs between the contacts and the jumper I'm talking about was inside my thermostat inside the house
*** looks like my reply didn't go through, here is a copy***
So the A/C works, that's great. Now you need to make sure the Contactor receives about 25 VAC (on the thinner side). If you see the voltage but the plunger is not closing, replace the Contactor. If you don't see the voltage, trace it back to the house to figure where you are losing it.
(Working with electricity could be dangerous so if you are not comfortable, please call a professional.)
@@Your-Self hey all good traced the low voltage wire to a cut wire from remodeling basement works fine now Thanks
Thanks, so helpful.
Glad to hear it!
Please help.. we have the temp set at 72 furnace will turn on and off throughout the day and heat will blow but won’t go past 64 degrees.. we noticed as the days get colder the heater won’t go past that, temp it is currently 14 degrees out.. when days were a bit warmer about 40 degrees the heater would heat to the desired temp.. Could this be the thermostat??
The most likely cause is a dirty air filter at the furnace. Try removing the filter for an hour. And if it starts working better, replace it with a new one.
Thanks. Help me alot..
Glad to hear that, and thanks for watching!
what about when I turn to auto, there is no air. when I turned it to on and Cool, there is air but the air is not Cool, it's just fan air. what is the problem here?
Yep, that's just air like a fan. Freon? compressor? You better call in a professional, sorry :