DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > No power to my thermostat




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Old 05-31-2013, 09:29 PM  
keepinitcool
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Those darn condensate pumps and their safety features! Usually don't see this issue unless furnace/air handler is installed in an attic or upstairs area. But good post about what could be a possibly overlooked cause of the problem.



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Old 09-02-2013, 09:40 AM  
mcluvin
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brywilliams,

Thank you! Thank you! Thank you! My Labor day weekend hell is finally over. I just did not expect that a float switch would also kill power to the thermostat, but not kill power to the wiring that controls the fan. I don't even want to admit everything I've done to troubleshoot and how many internet posts I've read. After reading your post I went out and looked at the float line. Sure enough it wasn't level. Got it level and now reading 28 volts between R & G at the thermostat. Yeah!!!!!!!

Chris

Also for anyone else troubleshooting a similar problem, voltage would fluctuate between R & C at the thermostat. The float would never totally kill the voltage but would keep it low enough to not power the thermostat. A couple times voltage was high enough to power everything, but it would soon fail again. I'm sure due to water again tripping the switch.



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Old 08-28-2014, 08:21 AM  
sandmyth
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This post saved me having to call for HVAC service. I checked the air handler in the attic, and the float switch had been tripped due to standing water in the pan below the air handler. I drained the water, and AC was back on in 10 mins. I'll have to check the outside drain line to find out why it was draining into the pan instead of the external drain, i'm guessing i have a clog somewhere. I guess any pvc safe drain un clogger would be fine to run down the drain line?

Glad this thread was the second google result for "themostat no power".

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Old 08-28-2014, 09:11 AM  
Wuzzat?
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Quote:
Originally Posted by sandmyth View Post
This post saved me having to call for HVAC service. I checked the air handler in the attic, and the float switch had been tripped due to standing water in the pan below the air handler. I drained the water, and AC was back on in 10 mins. I'll have to check the outside drain line to find out why it was draining into the pan instead of the external drain, i'm guessing i have a clog somewhere. I guess any pvc safe drain un clogger would be fine to run down the drain line?

Glad this thread was the second google result for "themostat no power".
I guess that's why my control board edge connector had corrosion; no float switch to turn off the AC.

I usually blast out clogs with a garden hose.
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