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ComfortZone
ComfortZone, HVAC Technician
Category: HVAC
Satisfied Customers: 516
Experience:  10 years in the HVAC industry.
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I have a WMC18-1A Inside unit will not turn on . I can get

Customer Question

I have a WMC18-1A Inside unit will not turn on . I can get the outdoor unit to run if I take the cover off and push down on the relay. There is confirmed power to the inside unit.
Submitted: 1 year ago.
Category: HVAC
Expert:  ComfortZone replied 1 year ago.
Do you have 24 volts at the indoor unit? Can you verify that you have 24 volts getting from indoor unit to outdoor unit?
You may have a blown 3 amp fuse in the indoor unit.
Customer: replied 1 year ago.
I checked the fuse. It is good
Expert:  ComfortZone replied 1 year ago.
Do you have 24 volts getting to the indoor unit?
Customer: replied 1 year ago.
Yes
Expert:  ComfortZone replied 1 year ago.
Do you have 24 volts to the thermostat between R-C, R-G, R-Y?
Customer: replied 1 year ago.
I will test and get back to you. I was thinking It was a circuit board board but I do not have the proper schematic
Expert:  ComfortZone replied 1 year ago.
Okay, let me know what you find out.
Customer: replied 1 year ago.
Ok I have 120 input. There is a plug with 2 blue wires on the board that read around 30.
Customer: replied 1 year ago.
I do not have 24 dc
Customer: replied 1 year ago.
I only get ac .
Expert:  ComfortZone replied 1 year ago.
Need to measure that the thermostat where the wires come into the thermostat from the indoor unit.
You should get AC voltage between the R and C terminals at the stat
Are you getting any voltage to the thermostat?
Customer: replied 1 year ago.
I had 120 coming into the inside unit. In further testing I obtained a schematic doing a Google search. The inside unit is supposed to have 240 ac coming in. There was a compromised terminal in the box outside. I fixed the terminal and got 240 back to the inside unit. That worked.
Expert:  ComfortZone replied 1 year ago.
Okay.