HVAC unit won't run after thermostat changeout

[@huskeralk]

Six years later and your video is still helping people. I just changed out my thermostat and it wouldn't power on. Put the old one back in and still nothing. Came across this video and found a blown fuse. Thank you!!

[@Ragentis]

You saved me a lot of troubleshooting and taught me some important details in the process. Thank you!

[@562936]

7 years later and you're still helping! Thank you!

[@danielogg8010]

THANK YOU. This video saved the day. Checked every part of the entire system and no breakers were tripped, was about to lose my mind. Thanks for my sanity back!

[@christiansmyth1466]

I just attempted to change my thermostat without shutting off power first and I was quite alarmed that the new t-stat didn't work, and neither did the old one when I put it back!! This video saved me an embarrassing and expensive service call. I found the fuse and the filament looked fine, but my continuity tester confirmed that it was in fact BLOWN. After a quick trip to the hardware store everything is fine. And while the unit was down I went ahead and put the new t-stat back into place, and it is working fine too. Thanks so much for this video!!

[@hillaryjonespac]

I just want to commend you on your thoroughness!!!! If I’m going to pay to have someone out to my house, I would love them to keep my system working well, and I don’t know that I’ve ever had anyone near as thorough as you were to this place! 👏

[@joeram92]

God Bless you man! I bought a house and installed a new WiFi thermostat. I turned off the the a/c breaker and replaced the thermostat. Once I finished I switched the breaker on and I had no power in the thermostat or a/c. I watched your video and after going back and forth, I realized that there is another breaker for the air handler, which I had not switched off. I opened the air handler and there was the 5 amp fuse blown. I made sure all breakers were off, replaced the fuse & boom, everything working 100%. Saved me a ton of money! Thanks for the video.

[@TandNServices]

Glad it helped

[@samuelligo7234]

Thanks man! You saved me a service call! Picked up a new fuse at the gas station and had the furnace back up and running in no time.

[@nemerson6518]

Was getting very frustrated and thought I was gonna break my thermostat plate with the way I was trying to pull the thing off the wall. Couldn't find any video showing how to take it off with the Honeywell design I had. But I saw the same thermostat on your video and after watching you pinch it from the top and bottom, I did the same and got it off, finally. Didn't come off as easily as your attempt, but it opened. Was able to change the batteries it said needed replacement. Thank you for this video.

[@KaoZ_Ph4nT0M]

You literally saved the day with this video. I get to sleep in AC tonight because of you!

[@tinkering_dad]

Thanks for this video! I unknowingly blew the fuse in my furnace after changing out the thermostat. 22° temperatures tonight. Lifesaver!

[@jmart03]

Thank you!! I was changing my thermostat out and didn’t shut off the power like an idiot. Found the burnt fuse and everything fired back up. You rock!

[@brysonmiller8562]

i dont mean to be off topic but does someone know a way to log back into an Instagram account?? I was stupid forgot my login password. I would love any tricks you can give me

[@jabarijaxton2339]

@Bryson Miller Instablaster =)

[@brysonmiller8562]

@Jabari Jaxton I really appreciate your reply. I got to the site on google and Im trying it out atm. Takes a while so I will get back to you later with my results.

[@brysonmiller8562]

@Jabari Jaxton It worked and I actually got access to my account again. I'm so happy! Thanks so much, you saved my ass!

[@jabarijaxton2339]

@Bryson Miller happy to help :D

[@MrGhorgon]

Thanks for this video! Installed a new thermostat in my house and made to "blue wire goes into B" mistake. Followed this video and discovered my mistake AND the blown fuse in the air handler! All running fine now.

[@drewpaloop6439]

Thank you! Because of your detailed video, I was able to have heat. The ambient temperature is 26 and my house is 52. I moved my thermostat and forgot to turn off the power. I didn't think I needed to because all the thermostat does is send a signal to the circuit board which identifies it as a code to turn on or off. I found the fuse, which was 3 amp, again serves no purpose other than to ensure that if you didn't know about this then you would have blown it and called a repairman. Why wouldn't they locate the fuse on the thermostat rather than the unit? Oh, that's right so you can doubt yourself and call someone to do it for you. Well, again, thank you for the video and the explanation of why you are checking the components.

[@erictrevino3339]

i got up to 2:02 on your video and fixed it..it was the fuse! thanks for up loading. YOU ARE THE MAN!!👍

[@mageoconner3142]

You are amazing. I just pooped my pants and expected a $500 service call coming, but with your video you saved me. Thank you very much for this.

[@drewsquickfix]

Replacing the fuse worked for me!! Thanks man you really saved me having to wait 2 days for an a.c. repair guy. 3 amp fuses available at ace true value hardwarw

[@BillyKnoth]

I understand fuses..... But I miss Lennox putting breakers on the transformers ..... Made it so much easier! Nice work Ralph !

[@seener1983]

I want to thank you for saving me a $150 service call I had the exact same thing happen to me and was worried I had ruined my furnace. I bought a new fuse and everything is working great!!!

[@tcr2237]

I did the same... shut the Hvac breaker off, didn’t check to make sure it was the correct breaker (thinking the guy who labeled the panel knew what he was doing) and bam, fuse blew.... I like the concept of shutting all 2pole breakers down (if you can). Thanks

[@jimcerrato8424]

Awsome job after 4 hours of messing with stuff and changing thermostat it was the fuse thank you !!

[@MattLsBr]

Did the fuse fix it ? And for how long

[@maribelr.2774]

Thank you so much for this video !! Help me so much. We called someone and charge us $200 and didn't fix it. So I change the thermostat and didn't turn on the AC and it was the fuse...thank you

[@TheSchoellerFamily]

Thank you! This was so helpful and saved me a ton of money!

[@AZ_sunshine]

thanks - great video, helped a lot with my original problem. Question . . I hope you have time to help me. I put in an Ecobee5 tstat and lost power, which brought me to your video. My system does not have a fuse. I replaced the transformer, added a piggy back 3A fuse to the secondary side. Still no luck, so I replaced the timer board and ignition control module and finally power back at tstat, boards etc. Once the ecobee was powered up the screen said 'delayed start-up" then read 100 degrees, then 110, then 120! I had to use an oven mitt to remove it. The ecobee contacts melted on the back on one side. Back to no power. Before moving forward would I need to replace the tstat wiring since the insulation appears to be melted to the copper wiring?

[@drewsquickfix]

thank you I suspected I possibly blew a fuse, I did turn the unit off but maybe something was loose when I turned it on. Ill check the fuse. I was switching out thermostats, new one was blank then I tried to reinstall old one blank too. LOL I scred something up. hope its just a fuse

[@HVACShopTalk]

Great work and testing Ralph

[@ItaBspicy]

I think you just saved me a service call for a damn fuse 😂 thx so much glad I choose this one n not any other 👏

[@Gatorinnola]

Great video. I accidentally hit the thermostat wiring with the weed eater next to the outside unit. I spliced the wires back together, but I have no power at the thermostat. I did not check for a fuse. Do most (if not all) have a fuse inside at the air handler? My unit is a Rudd probrably 2013 or so. Thank you.

[@joginderjatt]

Awesome video

[@Rueuhy]

I just got the same air flow meter a couple weeks ago. I really like it. I find at least a couple of bad contactors every spring this way. Any idea what takes them out?

[@TandNServices]

I don't really know what takes them out, I've found a couple this year so far also

[@gabrielvillanuevaiii3926]

Joe its obviously the filter was at the base of the unit. Those were stamped face grille's they only let the air pass.

[@allhoursmaintenance3022]

nice videos. Always look foward to them. Damn I mean Damn is that airflow issue that common. What do you do to charge them. Sorta wing it?

[@federicogonzales6625]

Great video my friend! Helped me a lot..thank you

[@rcorser1]

Very cool device for your phone!!!! Will have to try it out. :-)

[@steveborco8377]

Yep it was the fuse. Thank you! I probably saved lot of money.

[@aks0555]

Where is fuse located

[@axpertac]

Great Video, However I did not see you talk about the open Deep Trap in the drain. Without a Cap between the Trap and Unit, The Trap is useless as an air break. I am sure you addressed this issue off camera. Keep up the good videos.

[@TandNServices]

I've been caught, LOL your right about the trap, I left it out of the video to see who was paying attention. It was the first thing I noticed when I saw the unit.

[@danrichards496]

Took my nest thermostat off the wall to repair the big hole so I can flush mount it. Pulled the plug from the unit to the house because it thought that killed the power. Hooked everything back up and says no power coming from unit. Thought I might have broke the red wire but it looks fine. I hope like hell I just blew the fuse. Started looking online and it brought me here. I’m going to go up and check it.

[@TandNServices]

Good luck hopefully its just a fuse in the furnace

[@ComfortPlusHeatingandCooling]

Good Job Ralph.

[@JamesPettinato]

good video, I like your air flow meter & phone app, it looks uncomplicated, I like anything that's uncomplicated, I'll have to get one.

[@TandNServices]

Hey Jim, I think you will like the AAB it's pretty simple and only cost about $30

[@JamesPettinato]

T&N Services LLC. Thanks Ralph, I picked one up yesterday at my supply house, it cost $39. looking forward to using it.

[@TheProletariat.]

Jim Pettinato I've had mine now for a couple years. Impressed with the accuracy of it and ease of use! In one situation I came back with an air flow hood and got virtually the same readings. Great tool to have! I like being able to label and export the readings! I don't use that feature often but when I want some formal data right from the meter, exporting that data is a nice option to have!

[@harrydickson4575]

Nice work Ralph

[@drummerdem50]

Great job Ralph

[@thegolfnut812]

Check to see if your AC condenser has a pan with a float switch. I thought I had thermostat problems and board problems. Turned out all I had was a bad float switch causing the whole thing not to work. Check it first or remove it and connect the wires together, then see if you still have problems. Just would have saved me a lot of time.

[@zeke112964]

How much air was being sucked in the open vent on the condensate line?

[@christianwilliams3926]

Cool video, is that smartphone app any good?

[@jimmycargo655]

I have a luxair hvac system if have power into my control board will I still have my 24 volts to thermostat? I have no troubleshooting light and blower won't kick on w at her way.

[@Powlashvac]

Great job done

[@olenaerhardt7725]

After I changed batteries the thermostat shows wrong temperature, like 15F higher than it is. Can I repair it, or I need to buy a new thermostat? I have "White Rogers".

[@josemj059]

Nice video. AAB. AWESOME.

[@jhhvacplumbing1944]

Good vid Ralph

[@mattp5555]

Thank you sir

[@christyinthecarolinas]

I have this thermostat. It was just installed last August 2017. I've changed out the batteries and the numbers are still faded. Parts showing of the numbers and some completely faded out. I can get the fan to kick on with the switch but not the ac. I can't see the display. Any suggestions??

[@MiamiWebDesign]

Good video. I have a problem with my Lyric thermostat displaying an insufficient power error. I tested my wires red to yellow and red to white and there are 27 volts. However, red to blue and red to green only shows about 14-16 volts. Do I have a bad transformer?

[@TandNServices]

If your getting 27 volts your transformer is fine. Try looking at your green and blue wires to see if they maybe broken. I've seen them broken inside the insulation and it caused a problem like your talking about

[@DS-cp7xd]

ok here's a good question. I asked My property manager before changing out my thermostat. it was ok'd by them. I replaced my analog thermostat with a digital programmable thermostat, I followed the color guide on the mounting plate. I have a 4 wire system electric heat system by the way. red to red blue to blue yellow to yellow white to white. when I call for air the heat comes on. when I call for heat the compressor comes on but fan does not. I have to turn the fan from auto to on in order to get it too work. please help

[@MREvans-mn5od]

How do you change the fuse

[@chezisaac8833]

good video sir.

[@daviddeebotaylor391]

great video more plz

[@ryandunbar1314]

Swapped out old thermo to wifi with no common. Used the G for C but found no way for me to do a jumper in the air handler. It has NO terminal block. So now I'm clueless. Heat works fine and Compressor. But no fan or blower. Not sure what to do now

[@coldwavecooling3144]

No cap on the high side of trap?

[@jrolo307]

I called my landlord because the thermostat doesn’t work and the heater is extremely HOT that if i touch it , it burns and he never came what do i do ?? Help asap !!! Who do i call i have little and dont want them to get burned

[@tylorkirklin4636]

What happens when it’s an older model and there is no fuse?

[@jaydiaz4940]

I have same thermo but only the fan works.... Its not cooling when needed.. Help help

[@erikcable1755]

I guess heat strips have there use when the ambient temps are very low to help a heat pump put out warm air,but as a home owner I can not afford the cost of electricity and do not want to spent tons of money running heat strips...should I call for service again and have the heat strips rewired to come on only when they are needed?

[@TandNServices]

Yes you can do that, they make a outdoor stat the will only bring on the heat strips at certain temperature. It's code in some states, just not in Ga yet

[@gabrielvillanuevaiii3926]

capping the tee is a good idea and leaving the breather tee to vent

[@DanielGarcia-ky7cp]

where do I buy the fuse please? mine blew

[@TandNServices]

Any auto parts store will have them. Make sure you don't put anything about 5 amp in there though.

[@DanielGarcia-ky7cp]

+T&N Services LLC. got it fixed and running! !! I had extra fuses in my vehicle. put one in and it worked. only took me a few minutes. you have saved me hundreds of dollars. thank you so much!!

[@erikcable1755]

Hard to hear you.

[@MrBootheelboys]

Pm pp

[@GHOST-hp2ji]

Didn't learn anything.... Not good.

[@jimmycargo655]

I have a luxair hvac system if have power into my control board will I still have my 24 volts to thermostat? I have no troubleshooting light and blower won't kick on w at her way.