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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