Carrier Heat Pump with no 24 Volts at Contactor
Carrier Heat Pump
Diagnose: 2 Carrier Heat Pumps not running. Found no 24V at contactors on both units. Replaced both boards and contactors. 1 unit is now running and contactor pulls in correctly. 2 unit still doesn't have 24 volts at contactor. Switched boards to eliminate a new "bad" board. 1st unit started again with the board that was in the 2nd heat pump and is running correctly. I have 24V on my wire to the heat pump C, R and Y. C=Common, R=Power, Y=Compressor Contactor. I pulled the connector from the board and I'm still reading 24V on the above. So, I've eliminated the board and the connector. I do not have 24V coming out of the board to the contactor.
What am I missing?? Low or High Pressure Switches not allowing the contactor to pull in?? Some help would greatly be appreciated!!!
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Originally Posted by harlee37
Read your wiring diagram and follow it to your problem. If you don't know how to do this ask your boss or go back to school. Sorry if I seem a bit rough but I get tired of parts changers that don't really know how test and diagnois a problem so they change parts till it is fixed, which makes the rest of us look bad.
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