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Old 02-07-2012, 10:20 AM   #1
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Thermostat doesnt have power

I was trying to install a programmable thermostat. I couldnt get it to turn on. I ended up putting the old one back in place and now this one isnt working either. The display screen doesnt light up. The power is back on but still nothing. I believe i put all the wires back in place. I see in othe rposts white is usually heat, i dont have a white wire but have a brown? Any ideas?


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Old 02-07-2012, 10:30 AM   #2
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did you turn the power off to the furnace before working on the stat? if not you probably blew the fuse on the control board or the transformer is shot.


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Old 02-07-2012, 11:31 AM   #3
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if you have to LEDs on the new one or can't get FAN/ON from the subbase switch...TR is shot. remove the stat jump R to G for supply fan...if nothing the 24V is burnt or blew a control board fuse.

Last edited by biggles; 02-07-2012 at 11:43 AM.
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Old 02-07-2012, 12:26 PM   #4
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Old 02-07-2012, 02:39 PM   #5
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Sounds like the fuse. I changed a t-stat a couple months ago for my properties RHU and thought nothing of changing the t-stat with the power on. I went up to the roof dreading the worse and found the fuse blown, replaced and was good to go!
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