Troubleshooting if a Thermostat is BAD: Explained!
ฝัง
- เผยแพร่เมื่อ 31 มี.ค. 2016
- This is for testing if a 24-volt thermostat is bad. These are the steps you should take in order to verify that it is the thermostat that is bad and not the wiring or control board. When you make sure that the power is on to the unit, the light (if there is one) is lit inside the HVAC system and nothing happens when you turn the thermostat on then this video is for you. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our Related Videos/Articles
• Top 12 Problems/Mistak... 10
• Thermostat Wiring Diag...
• Thermostat Wiring to a...
• Thermostat Wiring & Re...
• Thermostat, Furnace, A...
• Thermostat Wiring & Re...
• Heat Pump Thermostat W...
• Wiring a Thermostat, F...
• How to Test a Heat Pum...
• Wiring a Heat Pump The...
• Heat Pump Thermostat T...
• Understanding and Wiri...
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our HVACR Educational Books, E-Books, Workbooks, Cards, Posters, and PowerPoints:
All Our Educational Products on Our Site: www.acservicetech.com/store
All Our Educational Products on Amazon: amzn.to/48pDd82
Mini Split Book and E-Book on Our Site- www.acservicetech.com/mini-sp...
Mini Split Paperback on Amazon- amzn.to/3ytHJSs
Mini Split Paperback on TruTech Tools- www.trutechtools.com/BooksGui...
Refrigerant Charging Book and E-Book: www.acservicetech.com/ac-book
Refrigerant Charging Paperback on Amazon: amzn.to/46xTeHf
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Our HVACR Online Resources!
Our HVAC Calculators: www.acservicetech.com/hvac-ca...
Our Newest Articles: www.acservicetech.com/articles
Try our HVAC/R Quizzes! www.acservicetech.com/quizzes
Our Other Resources: www.acservicetech.com/resources
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Tools Used in Our Videos!
Tool Links on Our Site: www.acservicetech.com/tools
Our Tool List on Amazon: www.amazon.com/shop/acservice...
Support the Channel by purchasing tools through TruTech Tools!
Use this link www.trutechtools.com/?aff=8
Save 8% at checkout using code "acservicetech"
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Follow Us On Our Social Media & Podcasting Channels!
Patreon: / acservicetech
Facebook: / acservicetech
Instagram: / acservicetech
X: / acservicetech
LinkedIn: / ac-service-tech-llc
Tiktok: / acservicetech
Spotify: open.spotify.com/show/74KXLz5...
Apple Podcasts: podcasts.apple.com/us/podcast...
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
#hvacr #hvacr #hvactrainingvideos #hvactraining #hvactraining101 #acservice #acservicetech #oil #thermostat #problem #top10 #hvacthermostat #hvactips #hvacproblems #thermostats
▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal.
![[안방1열 풀캠4K] 베이비몬스터 'FOREVER' (BABYMONSTER FullCam)│@SBS Inkigayo 240707](http://i.ytimg.com/vi/_2HL-ogzzBU/mqdefault.jpg)
Our Inverter Mini Split Resources:
Mini Split Book on Our Website- www.acservicetech.com/mini-split-book
Mini Split Paperback on Amazon- amzn.to/3ytHJSs
Mini Split Paperback on TruTech Tools- www.trutechtools.com/BooksGuides?aff=8
Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ
Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399
Our Single Speed and Two Speed Air Conditioning Resources:
My Paperback and E-Book: www.acservicetech.com/the-book
My Paperback: www.amazon.com/shop/acservicetech
Read the book reviews on Amazon!
Check out our new Articles at www.acservicetech.com/articles
Support the Channel by purchasing tools through Tru Tech Tools!
Use this link www.trutechtools.com/?Aff=8
Save 8% at checkout using code "acservicetech"
My Service and Procedure Book- www.acservicetech.com/the-book
Tool List- www.amazon.com/shop/acservicetech
Support- www.patreon.com/acservicetech
For those that are looking for the tools used in the videos: (Linked Below)
UEI DL479 Multimeter with temp sensor amzn.to/2jtsUbJ
Magnet Jumpers- amzn.to/2PyKPQZ
Alligator Jumpers- amzn.to/2PxqJXn
Fieldpiece ST4 Dual Temp Meter amzn.to/2wc1ME3
Fieldpiece Bead K Type Temp Sensor amzn.to/2DBwKfs
Fieldpiece Wet Bulb Temp Sensor amzn.to/2RRI7Tw
Fieldpiece TC24 Temp Clamp amzn.to/2qHLyjZ
Yellow Jacket Refrigerant Gauge Set amzn.to/2aenwTq
Refrigerant hoses with valves amzn.to/2aBumVI
Yellow Jacket Gauge set & hoses amzn.to/2vLVkV9
Yellow Jacket 4 Port Manifold w Hoses amzn.to/2BkuGIq
FieldpieceSMAN360 Digital Manifold Set amzn.to/2BdoaD4
FieldpieceSMAN460 Digital Manifold Set amzn.to/2nB4Fe6
Compact Ball Valve for Refrigerant Hose amzn.to/2KUisW8
QuickDisconnect 90 for refrigerant hose amzn.to/2MMtVcg
JB 6 CFM Vacuum Pump amzn.to/2nqbvo8
Appion Blue 3/8" to 1/4" Vacuum Hose amzn.to/2uYlVyc
Appion Red 3/8" to 1/4" Vacuum Hose amzn.to/2uYg6Ro
Appion Valve Core Removal Tool amzn.to/2uYr8WL
Yellow Jacket 1/4" by 1/4" hose amzn.to/2umtcod
CPS Vacuum Micron Gauge amzn.to/2v1nM3O
Supco Vacuum Micron Gauge amzn.to/2v1JRiA
RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn
UEI DL389 Multimeter amzn.to/2xAdaJf
Air Acetylene Torch setup amzn.to/2aQalsb
15% Silver Brazing Rods amzn.to/2gVLyLc
Nitrogen Regulator amzn.to/2bXdR5f
Nitrogen Flow Meter amzn.to/2brvoBg
Other tool links can be found in the video description section.
Shop through Amazon! Your Purchases through Amazon provide a means for channels such as mine to earn advertising fees from all purchases after clicking through. Prices are the same as normal- www.amazon.com/shop/acservicetech
so before i do anything, i should shut off power to house right? so i dont get electrocuted? then open the panel display? I have a honeywell CT500 that goes blank every so often and now not generating cold air...i have a brand new AC unit too. it has no batteries, so that cant be the problem. i also reset the circuit breakers and the display panel of thermostat still goes blank and then re-appears. it does this every few minutes or so. is it a problem with the wire connection of thermostat? is it loose?
I recommend calling a tech but they would shut the power to the hvac system off and take the tstat face plate off and tighten the connections on both ends, in the thermostat and in the furnace or air handler. After that they will check for 24v to the thermostat and if they have it then it is a bad thermostat. It could also be one of the pins not aligning on the back of the thermostat.
did u power off the thermostat? i see nothing on the panel at the beginning of vid.
How to replace thermostat for boiler heater
How to replace thermostat for boiler heater
Thank you for saving me a costly service visit! Your suggestion of tapping the R and G wires helped me confirm a bad thermostat! Thank you for taking the time to produce easy to follow instructional videos with detailed explanations that don’t require hvac training to understand!
Glad it helped!
Hi---It looks like you understood what he said about the red and green wire. Did he say the thermostat is bad if the fan DOES come on when touching the red and green wires together or if the fan DOESN'T come on? Thanks for your help. Jesus bless.
@@sandrarichardson2713 Hi! He said if the fan turns on when you jump the R and G, then the faceplate/thermostat is bad. Good luck!
Awesome, I just completed tech school last fall and I'm working for an HVAC contractor! ALWAYS learning!
Great to Hear and in this trade, we all will always be learning! Keep it up because over time you will move up the ladder right past those that stop searching for answers and learning new things! Thanks
The best instructor on TH-cam... he makes it so easy to understand.
Thank you very much Dwayne Wallace! I am glad you appreciate the video!
The explanation and demonstration is so very clear and Very much appreciated, Thank You!
I just solved my problem with my 1950"s Lennox Furnace with this video. Thank you for all the great videos!
Thank you I’ve literally watched atleast 2 videos every day and I’ve become a better tech because of you thanks a lot I have to get better at gas furnaces and diagnosing electrical issues
That is awesome to hear Will! Thanks for letting me know!
For anyone who's control panel is working and whose unit is fine but doesn't seem to be sending data: If continuity from the screws to the copper is good, look at the AC unit's circuit board and check the fuse(should be purple or amber). I accidentally blew it somehow when moving the thermostat. Easy fix!
Thanks! You saved me so much time. Couldn’t figure out what my problem was!
This video was a BIG help! Thanks for posting it!
*Easy to assemble **Fastly.Cool*
I’m having intermittent thermostat issues. Going to replace it tomorrow am when the store opens. I appreciate the video, it confirmed what I had done.
Thanks for letting me know!
Great video! It is to the point and easy to understand. Thanks!
Thanks Josh!
Thank you so much for a concise clear video on troubleshooting.
Thanks Josh!
Again another great video...
Thanks Robert!
Thank you so much for helping me bring heat back to my home for my family!
I learned alot. Thank-you!
My man!!!!!!!! After I changed almost everything in the furnace, not works until I did the test G and R and the thermostat was bad . Now my furnace work like 7/11 store non stop. Thank you so much bro
Thank you, I was able to fix my AC problems using this video, thanks for taking the time
Awesome to hear, thanks!
This helped me out tremendously! Thanks alot
Great video. Thanks for the help
Thanks Mike!
very practical video, thank you ...
Thanks Pei Broker!
Hi and thank you for your videos. I have tried extensively to troubleshoot my thermostat issues but to no avail. The electric furnace works, in so far that if I switch it off from heat to off. If I don't it will just continuously run. I am beginning to wonder if it is a wire issue between thermostat and furnace, as I have replaced the thermostat 4 times in past 5 years. (with same thermostat rth 221). However this year it is not responding to program or hold function. I have five wires coming out (red, white, green, black, and orange.) I don't have pump so orange not in use. I am not sure if relevant but the program and hold feature do work if I remove black wire, but there is no heat when operating with this configuration. Thanks
I been seeing your videos for 2 years before I became a tech , and even now I always see them and learn dude . Ur a great teacher , I can only image how your helpers or family members who are intrested in the trade turns out to be man . Thanks and please always keep uploading more videos .
Thank you very much Gabriel!
Thank you! Info helped diagnose the thermostat.
Glad to help Andrew!
Thank you very much for your video. My system was keeping running when both inside and setting temperatures are matched, what is caused the problem inside the air-handler, need help?
If you need heat in an emergency, would you have to connect the three wires (r g w) altogether? Or will just jumping the r & w work?
Thank you for sharing your knowledge brother ! You’re a great Teacher and Tech!
Thanks a lot Darin!
Great video and a good explanation of why the industry moved away from the old mercury switch. Those switches would bounce those compressors on and off until the mercury settled. A five minute delay is a bit long but better safe than sorry.
Yes if I need to turn it on quickly then I use the mag jumpers, otherwise I have time while doing other maintenance, Thanks
Do you have anything that shows what wires should be connected at the furnace from the thermostat to the fan motor ?
Thanks for the awesome video bud!!
Glad to help chingonyayo!
also If the reversing valve solenoid was beginning to short out would it fry the defrost board or the thermostat? its a lennox 13hpx-030-13
I had a call where the AH was running but the condenser was not. I had no voltage between C and Y at the control board outside or the AH. Pulled out the Tstat and jumped between R and Y and the system came on. Tstat was bad.
i enter youtube to look for thermostat problems, cause i got a service call for tomorrow, boom this video give me all i needed. ty
Looking at this video while doing a service call lmaooo
Thanks very useful ❤️🙏
Thanks much. Helped a lot.
Glad to help!
Very helpful,,,thanks
Awesome video. Good teaching tool ...please keep up the good work ...
Thank you very much!
acservicetech I have a White Rodgers thermostat that is not working right. I have no control of the temp settings. I touch up or down arrow it goes to 90 by itself. Heat kicks on and run for maybe 2-3 minutes and drop to 62 and eventually cuts off. Is tstat bad? Please help me
Outstanding. Great work
Thank you very much!
thank you very much SR. you are the man!!!
I am glad you enjoyed the video Luis!
I have a question if you don't mind answering it. I have a Honeywell thermostat, and it would blink like the thermostat was about to turn off completely. So I switched the coin cell battery and when I put the front plate back on to the back part mounted on the wall. I waited for it turn back on, and I put the cool air to auto and on 65. The fan never came on tho, and even when I bring it down to the lowest temp. It would still say "Cool On", but nothing. What could it be? Should I do what you did in the video?
I did turn the breaker switch to Off, and then back On and it worked for a min then it shut off. Smh.
Awesome. Girl Power. You helped me figure it out. I GOT HEAT. I so refused to call service man. I knew if air conditioner worked and I tested just like you showed to boot the fan, then I knew it wasn't the furnace. I have where red wire could go either to RC or RH, it was at RC so I hooked red to RH and I got heat. Thank you
I have RC and RH. How did you test the thermostat?
Even though you now have heat, that's not really the proper way to do that. You shouldn't have to constantly switch your live wire over every time you want to switch between heating and cooling. If you only have one red wire coming in from furnace control board, it should be hooked into the RH terminal, while a separate jumper wire should be connected between RH and RC.
Thanks a lot
Thanks Helps a lot.
Glad it helped
Thank you, looking forward to it!
Great video... thanks
Thanks Charolito1312!
A service guy came and told me the first stage heat pump does not work because he could not feel the heat when touching the tube. Do you have a video to check which heat pump has problems in the two-stage electric AC+furnace system?
When you say fan, are you referring to air handler fan or compressor fan? My AC is not getting 24V at contactor to turn on compressor and compressor fan but air handler fan is working. I'm getting 24V b/w R and Y, R and G, R and W on thermostat. When thermostat calls for cool, G and Y goes from open to shorted (connected). So the thermostat is working fine, correct?
very educative thank you. regards
Thanks Sesha!
Sesha Chary, I am very appreciative that you chose to Support the ongoing work of AC SERVICE TECH through Patreon! Feel Free to email me any questions you may have at info@acservicetech.com also let me know what questions you would like answered or shown in the quarterly Insider video, thanks!
I just have a red and white wire. I only have heat so that should explain it, right? My panel “works” meaning it can be set etc, however it has no impact on the furnace. If the heat is on it keeps staying on... and temp keeps rising. Any suggestions?
thanks this video helped us at our home
Thanks Mike!
Excellent tutorial. I asked a guy years ago how he knew the tstat was failed, he said, 'I jumped it' and I assumed but didn't know that meant (esp with multiple wires, and why). It makes sense if something is simply not turning on. If it starts/stops w/o hitting temp, I assume that is on furnace side?
good video thank's!!!
Cant see any thing you are doing,
My Lennox Air Handler CBA 27 fan will not come on on circulationg "ON' setting since it was installed 3 years ago. Just running AC from my attic. Would like to circulate the fan all the time. I have even changed out the thermostat. Any thoughts?
Any idea what would cause the blower motor to blow harder once I removed the jumper wire to diagnose the thermostat. My blower kept blowing for about 20 seconds after I pulled the jumper wire and it blew harder than it did when thermostat was working
Thank you!!!
Thanks jimmy ung!
Another way I have done it. I used the pins on the back of the thermostat battery operated type. Call for blower the pins should ohm out. Same thing for calling for heat. Make sure you are connecting to the correct pins because they are not marked you have to reference how the pins plug into the back plate.
Before jumpering the R and G, I would use a multi-meter and check for 24V A/C between the R and C.
Yes, sometimes there is no C to test from though, thanks Eric S!
@@acservicetechchannel Was just going to say, that method wouldn't do you any good for a thermostat with batteries..
great info
Thanks Thul kiful jones!
My heat- off-cool button is stuck. It will go the left towards cool, center, but won't go to the right (heat) when pushed. Any ideas? Mine is the opposite way from the one in the video.
So clearly explained and helpful. Thank you so much.
Lets me know if I should call our utility that installed the energy saving thermostat or if it's time to call an AC tech without wasting his time or mine.
That is great to hear, thanks
Good Stuff, My pro TH8000 on Cool or fan, the heater turns on. This test should expose issue that I believe is 25 yr thermostat
For some reason. On my Goodman single stage furnace. I jump r with the A/C and it works. But my heat and fan don’t. Any reasons on why?
I have a 2 wire Carrier edge thermostat- any way to test that?
Is there a follow up video of what to do if this doesn’t work?.. I recently got a new condo.. I installed a “smart thermostat” by EcoBee. It worked fine for a few months but then suddenly stopped. I’ve flipped all breakers, I tried the things in this video.. what is weird is that since it is smart, it will send me notifications when it turns on about the temperature. I will be at work, and out of nowhere (nobody lives in my condo than myself and my cat) it will turn on for like 20 minutes and then go off again..
Thank you sir
Glad to help Vjn!
The only way to get my heater to kick on is to change the fan selector from AUTO to ON. Then when the desired temp is reached I change it back. But then it wont kick on again when the temp drops. Should I just replace the thermostat?
I appreciate this video man. I'm relatively new to the trade so thermostats always scared me lol
I got rth5100b is there a video to show me how to hock it up in my RV
What’s wrong when the thermostat works on fan only ? When put on auto the ac and the heat don’t work. It does nothing, no sounds or anything
thanks for the video. My thermostat (Honeywell RTH2300B1102) is blank and controls do not work at all. BUT AC is still running and it is very cold in here. I can not stop the AC by switching thermostat to OFF. AC did stop when I took off thermostat cover. Do I need a new thermostat?
Yes it sounds like you do, thanks
I have a hunter programmable an I was wanting to know what the switches on the back of the panel are it says non/hphp sw3 witch one should it be on I have gas
It would be non heat pump if you just have an ac with gas furnace, thanks
I helped the fan by spinning it manually. It slowly turns on. Air is still humid. Not blowing cool. I turn the furnace off, but the fan still sounds like its on and it doesn't spin.
Would this be a thermostat problem?
Thanks - just tested mine and it was, indeed, the thermostat - fixed and back to cool for $25.
Awesome, thanks!
Do i need to connect 3 wires together to check my heater?
I mean the red is power and the fan wire plus heater wire? or just
2 wires red and the heater wire? Thanks
Just two wires R and W as the furnace will know when to turn the fan on by itself. Thanks
My ac wasn't blowing cold so I had a tech recharge the refrigerant. It helped but now, a week later, whenever I switch the thermostat from ON to Auto, the fan doesn't blow. Any suggestions?
Super. An easy one!
Thanks NMranchhand!
Hi. The screen on my thermostat is blank. I replaced batteries, nothing. A couple days was back on. Now blank again…but, if I press the temperature up, it comes on (not the screen, the furnace). Also, if I turn fan on it comes on. Any ideas 💡. Thanks so much.
I just put in a new condensate pump. Pretty simple. Turn off the power, unplug the old little giant and remove. Install new little giant, plug in and power up. Problem is that after doing this I have no power to the thermostat. I jumped the fan but it doesn't run. It's a tempstar and I don't believe there is any reset switch. I have checked fuses and breakers and all are good. I filled the reservoir and the pump works. The pan is not switched for water. The fan just hums. I checked the capacitor and it shows 7.3. Any idea where to look next?
I’m reading 24 volts between R&Y , R&W , but only 12 volts between R&G. Could it be a transformer issue? Or a short on the G ?
Thank you for this video, the logical path you have laid out, though not exactly the issue I had, it helped me draft my own plan and it helped me diagnose my issue. I was getting 24V at the thermostat, and at the circuit board at the air-handler in my basement. I can hear the thermostat click when I switch to AC or Heat. Heat came-on (this was summer and 80 F Day so I had to set the thermostat to 82 or something to get it to work, but it worked, the AC however did not. Knowing that I got 24V (my meter showed about 27v), so I knew volts should be going out to condenser outside. But the condenser did not start. I saw no 24V at the contactor. I pushed the contactor and it started, condenser and I held it there for a few minutes and family inside confirmed getting cold air, so I knew no issues with the condenser/ compressor. So basically the issue was between the wire that came out of air-handler to the condenser outside. I started following the 24V wires from the contactor to the wall, and I found the issue. I should have looked for this as soon as I found a mice nest in the condenser, they had chewed one of the 24V wires and thus contactor did not get the juice it needed to kick-in the condenser. Once I patched the wire, everything was working again.
I have seen folks ask where to buy some of the electrical parts (Contactor, Transformer, Capacitor, etc.) I found these on-line, but you have to wait for a few days, alternatively if you need one quickly I was able to buy at Grainger that is not too far from me, and a GPS (General Plumbing Supply) they had some of the parts I needed as well. This is just an FYI.
Glad to hear, thanks!
Any idea why my heat pump won't shut off after reaching the desired thermostat setting? It does turn off if I turn off the whole unit at the thermostat. Just not when it's supposed to when it reaches the desired temp. Any ideas on that?
Sounds like a bad thermostat, thanks
So my AC and fan work yet my heat (propane) does not. I did the red and green as you instructed and the fan ran so could this be the reasoning behind my heat not working properly? Does this also cause short cycling?
If I wanted to check the heat I guess I would have to jump the Red and White?
Do you have a video on testing the thermostat wiring for shorts and or breaks?
Yes I do believe. Look through the "acservicetech Thermostat Troubleshooting Playlist" for the videos there, thanks
Hi I have problem whith my termostat, it turn on no automatic just on and when I change the automatic it works. But when comes to the right temperature inside doesn't turn off, and when turn off try to turn on again but sounds only a click on it and dosnt start. Can you help me please ?🙏
Thank u for the video. In my case the display will come on , the clock keeps flashing , but whatever I pressed is not responding. I did connect the red and green wire and the fan came on . Do u think it's the thermostat?
If you turn the main power back off and on and the same thing happens it should reset that. If there are batteries and it is hardwired, go ahead and remove them before turning the power off and then back on. If the thermostat will not let you out of this function after turning the power off and back on it sounds like the thermostat is having a problem. Also look uyp your model number and verify the procedure for adjusting the clock. Thanks!
thank u for replying. it's Carrier A99068 model. press the time/Temp button and press the up and down until the correct is displayed, but when I did that nothing moved.
Ok, yes it sounds like the thermostat then. Thanks
The free heat I get from my apt. complex isn't enough for me sometimes, and I'll put some ice around the thermostat. This trick used to work big time, but now it doesn't work at all. Have complexes gotten wise to this trick, and devised a way to prevent a sudden drop in temperature from being taken seriously? The thermostat will say the heat is on when I do this, but the baseboard heaters stay cold. But if I remove the ice, and the temperature returns to normal, the heaters will come on naturally from a natural drop in temperature. Does anyone have any thoughts on this, and what I can do to fix it?
my thermostat seem to lower the temperature by itself sample the heat inside will be 70 and the thermostat will be reading 67 after a few hour of working can this be the thermostat.
The thermostat is supposed to be on an inside wall and not near an opening to the house. Also sometimes the hole in the wall can let cold air in from behind the thermostat if there is a bigger hole going into the crawlspace or attic. Other than that I would just replace with a new one. Thanks
yaraivery moore-burgos. Mine doing the same thing! Reads 30 degrees, but its 80 in my RV. This is preventing the A/C from turning on. Let me know if you replaced your thermostat and if it fixed the problem. Thanks.
So if you jump the 24v wire to the g wire and it turns on (thermostat is set to auto not fan), that means the thermostat is bad ?
I have a question the hurricane I just had knocked my power out for a day and when the power came back on my a/c unit didn't... What's wrong with it?
Is the thermostat power on? Is the indoor fan not running or is it just the outdoor that isn't running? Basically, did the breaker turn off, did a fuse blow inside the unit or a fuse blow at the disconnect at the outdoor unit? I was just looking for more info, thanks
i put a new thermostat this summer honeywell RTH111 it work well , i try to turn on the heater today i hear the gas came on but the fan is not working or do i need to wait a little bit and the fan came on
If the furnace is trying to turn the heat on then it is receiving the signal from the thermostat. It is past that and in the furnace. It sounds like maybe with the power off the capacitor should be tested or at least a tech will start there if the blower motor is not coming on. This one would test with the power off. ---- th-cam.com/video/flbUtLMeSOQ/w-d-xo.html
I have a blank screen on my thermostat. Outside unit, so no drain pan. Thermostat wired to house so batteries not needed. However, the screen comes on when I install batteries. But nothing else happens. But the two snowflake icons flash. This is a 3-year-old PRO1 t701 thermostat with a Comfortmaker unit. What would you recommend I check? It's a hot Saturday night in Texas and having a heat stroke in the past, I don't handle heat well.
You would need to check the 3 or 5 amp fuse in the outdoor unit after turning the power off. test from r to c with a multimeter for 24v, thanks!
At 4:48 you said if the fan not come on do you mean fan blower or condenser fan?
Thanks for the question. I am referring to the blower motor only turning on. Thanks
First than everything thanks for the video well explained .. My friend I put the thermostat at 83 this morning and it shutoff all the sistem now it won't start. and nothing in the screen I put new batterys and nothing.
Did you check to see if you have 24v on the indoor unit from r to c? It is possible the power at the indoor unit is off or fuse is blown, thanks
Yes I do the thermostat was the problem. I buy another one of the same i just put the new in it problem solved..thank you very much for your help.🙏🙏👍👍
Thanks
No problem
I did this test and it did turn on the fan. Is bad thermostat also be the reason why i got limit circuit lockout? Thanks in advance.
No a limit circuit lockout would be from one of the sensors or from a component within the sequence of operation only. A thermostat is just a signal voltage going to the control board terminals. Check out this video on the sequence of operation----th-cam.com/video/uKsRpYmwlnM/w-d-xo.html
Having problems with the air conditioning sometimes when it is on there is no cool air coming out..had a wellness ck up in june..guys said outside unit was fine just needed cleaning.. But once in awhile it seems the spark doesnt start the cool air..we turn it off for 10 mins..the on and it will start..could it be its not firing up correctly?
Also inside temp will say 82° and will not go any lower..til we turn it off for 10 mins then restart.we.always change batteries first a check fusebox..fusebox not hot..
Went through severe storms and had a big power surge several times. The unit wouldn't come back on and since it was cool weather I thought it was just the heat but it's the ac also. I have power to the unit and the tstat has it's digital readout but I switched from off to ac and nothing happens. So no heat and no ac and I really need my ac it was 95 in my house last night. Thanks for any help.
Did you connect the r to the g to see if the fan would come on? Is it possible the thermostat has battery power but not 24v at the r terminal. The fuse inside the furnace may have popped or the switch or breaker may be off to the furnace, thanks
Do you have a video if the fan Doesn’t come on, where to look next?
I'm still not clear under what circumstances should there be a jumper wire connecting the RC and RH terminals. I see in the video they each had their own wire back to the old system you removed that had separate transformers (furnace and one for AC) so I'm thinking since new systems only have a transformer in the furnace ...but what does the jumper wire accomplish?
You are correct and the Rc can connect to G and to Y but the Rh only can connect to the w so that is why they need to have the 24v input voltage jumpered to both for a single heat and ac system, thanks
Believe or not sir, you are the best
Ha ha, thank you very much Chick. I am glad you enjoy the videos!
@@acservicetechchannel Sir pls i need your help. How do you check sub cooling on a mini split with no service valve on the liquid line. Thanks in advice
So if the minisplit is a vrf then we the manufacturer usually doesn't give us any charging guidelines for it. What I have found though is that in cooling mode when the temp was above 70 degrees, many systems operate at 0-5 degrees of superheat on the full speed emergency cool call. The only reason that they function like that is so the saturated state is arger and they use the accumulator to protect the compressor. In normal units, low superheat would be a big problem for the compressor. The manufacturers just want us to use the total weight method for checking the charge which is a complete recovery, pressure test, find and fix the leak, pressure test again, vacuum, break the vacuum with the total amount of refrigerant that the system says it needs per the rating plate plus additional line set length, thanks
@@acservicetechchannel great