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Compressor not running but hot. c to r and c to s show infinite r to s shows 12ohms whats the problem?

HVAC system compressor is not running but hot to touch. Using ohmmeter the motor windings show common to start and common to run as infinite ohms and run to start shows 12 ohms. What is the problem?

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  • DON
    Lv 7
    1 decade ago
    Favorite Answer

    Since you had no connection from common to either winding, I suspect that the internal thermal overload was open at the time when you took your measurements. Let the compressor cool down and take your measurements again.

    Most likely your compressor is seized, or there is a problem with the start relay or PTC thermistor.

    Don

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