Thermostat Wires Sparked,no AC - HVAC - DIY Chatroom Home Improvement Forum

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Old 08-02-2012, 11:05 AM   #1
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Thermostat wires sparked,no AC

i was wiring up a new honeywell thermostat and the wires sparked as i was doing it. i didnt turn anything off prior to wiring it up, unfortunately. im confident it is wired correctly, however the ac unit wont even turn on. what would i have caused from the spark, and any suggestions on fixing it would be greatly appreciated!


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Old 08-02-2012, 12:22 PM   #2
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you actually might have either shorted out your tstat, or your transformer, or maybe both it is crucial to always have all the power off when servicing a system, whether it be just a tstat


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Old 08-02-2012, 12:43 PM   #3
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Look at the air handler control board for the little 3 or 5 amp transformer fuse. It is likely that all you did was blow that. Replace it and you should be good to go... assuming you get the stat wired up correctly. As the other poster said, have the power off whilst doing the wiring to avoid this sort of problem.
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Old 08-02-2012, 01:56 PM   #4
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and why didn't you shut the furnace toggle off? if red touched the C terminal you cooked the transformer. if anything else might of blew the fuse on that circuit board hope you have in that furnace.if you can run the FAN/ONLy from the stat your good on the TR 24Vs if not LEDS or fan action the 24Vs isn't happening.check the fuse on the board.if you have an ohm meter disconnect the primary and secondary sides of the TR an ring them no audible or ohm reading the winding is open.from the spark...
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Old 08-02-2012, 06:26 PM   #5
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always shut off any electrial appliance before service....may have fried ..tranformer...or blown 3 or 5 amp fuse on control board....
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