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I have Carrier mod#24ANA760A300 Infinity system. 1.5yrs old. Compressor nor fan outside will start. The controller on unit flashes an error for low pressure switch open (error #32). Gas pressure is normal! My technician says that he will have to order a new compressor because of some checks he has done. What I need to know will the controller show low gas pressure if the unit has never started even though the low pressure switch is closed as it should be with proper levels (checked the switch and is closed less than 1ohm across it).

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  • cohrs_gen Jul 22, 2009

    The switch was isolated when tested. I also tried the system with the circuit open to the board, no switch connected to it, open circuit, which should have changed the error code to an open circuit symptom or tripped condition (#83). Nothing changed, I shorted out the connection to the board at the socket to simulate the switch closed but still no change. Will the board give this error until the system actually starts or is the board giving incorrect errors.

  • vaneddies May 11, 2010

    did you isolate the switch when tested? can you bipass the switch to see if if you have functioning comp/fan?

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No unless there is a loose connection of the wires or terminals between switch and controller

Posted on Jul 22, 2009

  • relaga58
    relaga58 Jul 23, 2009

    After bi-passing the switch did you try off and on circuit breaker, sometimes main PCB board needs to reset this way. This board when doing weird things needs replacing.

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