Quote:
Originally Posted by myselff77
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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So you are saying you have 24v at the outdoor unit at the control board? If you measure voltage by putting one lead on the red wire and one lead to the frame or ground you have 24v?
Or are you saying that you have 24v inside but not at the outdoor unit? If you do not have 24 volts to the outdoor unit it will not run and you probably have a bad thermostat wire.
The wire that is connected to Y is your call for cooling if you have nothing there at the outdoor unit, condenser, then there is no signal from the air handler to make the outdoor unit operate.