Question:

RUUD Central Air/Heat Pump

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My heat pump will not come on in HEAT or A/C. I thought I might have a simple defrost control board problem, but still no go after replacing the board and the defrost relay. I checked the pressure switch and it is not tripped. I've checked all the circuit breakers and they, too, are all set. I've checked the outside unit using the "test" switch inside on the start relay and the unit will come on, but won't stay running on it's own. When I select HEAT, I wait the necessary five minutes for the unit to switch and it keeps switching to AUX HEAT. In A/C the unit does nothing. Can someone provide me with some guidance, here?

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