Connect Wifi Thermostat to Goodman GMP050-3?
Home Improvement Asked by Wellington on April 11, 2021
I’m trying to connect up a wifi thermostat to Goodman furnace, specifically the GMP050-3.
I’ve done some reading on this but I’m still not quite sure how to go about it. Specifically, I’m not sure how (or if) I can find a substitute for the C wire on my wifi thermostat. Thanks.
Schematic:
And here are photos of the actual furnace wiring:
Thanks!
2 Answers
Looks like you are not the first person with this furnace. If you have air conditioning then... http://www.dslreports.com/forum/r28226387-goodman-GMP050-3-Gas-Furnace-where-to-find-24vac If not then do you have a voltmeter? You are looking for constant 24 volts a.c.. Might be that BL wire that connects to the C1 terminal. Check between there and the R terminal.
Answered by user68386 on April 11, 2021
One of the terminals of the transformer has 3 blue wires attached. Use that terminal as the "C" terminal.
Answered by jon daniels on April 11, 2021
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