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Hey HVAC experts… AC is on the fritz and spent the day troubleshooting, but couldn’t figure anything exact out. Anything I might be overlooking before calling some HVAC Company on Monday?
Overall issue: Nest thermostat was showing a E183 error indicating a problem with the Y wire. Also outside unit not turning on.
I thought it might be the contactor. Went to outside unit. It would manually turn on fine when manually pushed. Then I checked for 24v coming in and got nothing. So I’m thinking the contactor may be fine and it just is t receiving voltage to engage.
I checked the control board with a multimeter. 24v properly coming into the board from the transformer. Again nothing at Y. I could see voltage properly come through green and white when thermostat called for heat or the fan. The control board LED is blinking a continuous slow steady red indicating no problem. I tried jumping the red and yellow to see if that would kick on the outside unit, but no luck.
So I can’t figure it out. Faulty Y wire somewhere? Just seems strange I can’t see voltage on the Y coming in from the thermostat, but also don’t see anything to the outside unit when jumping either. Anything additional I should look at?
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