Troubleshooting if a Thermostat is BAD: Explained!

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.
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⚠️ 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. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
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[terencechan]

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!

[binjagav]

My 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

[frustratedmechanic]

The best instructor on Youtube... he makes it so easy to understand.

[leo]

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

[cozmicmojo]

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!

[vetdadcubby]

Awesome, I just completed tech school last fall and I'm working for an HVAC contractor! ALWAYS learning!

[DaBuick]

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.

[davidfc]

I just solved my problem with my 1950"s Lennox Furnace with this video. Thank you for all the great videos!

[willlove]

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

[st.charlesstreet]

The explanation and demonstration is so very clear and Very much appreciated, Thank You!

[madurasenju]

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 .

[MrRasgabriel]

Thank you so much for helping me bring heat back to my home for my family!

[melvin]

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.

[williamowen]

This video was a BIG help! Thanks for posting it!

[robertnieves]

Thank you, I was able to fix my AC problems using this video, thanks for taking the time

[mostlikelywedoitservices]

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.

[cassondrad]

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

[jasonharris]

This helped me out tremendously! Thanks alot

[libertyfox]

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