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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7540
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a rheem ac and came home from vacation and the ac was

Customer Question

I have a rheem ac and came home from vacation and the ac was not working
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: Since last night
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: I checked my outside condenser unit and the board has incoming voltage but does not light up. I do have 24 volts coming to my thermostat, I also tried to turn on the fan blower on the air handler and that also did not work. I went in the attic and checked the air handler. The 24 volts was good coming into the board and a red light was flashing fault.
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: Thermostats settings ?
Submitted: 3 months ago.
Category: HVAC
Expert:  Phil replied 3 months ago.

Hello, Either the blower door switch is open, or if your system has the optional float valve in the condensate drain line it is open, or the printed circuit board is bad.

Check the blower door switch, and look for a small float switch fit into the 1" in diameter white PVC condensate drain line. We can go from there.

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