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cpenn

Roof A/C

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Roof a/c fan and compressor will not engage...Same result when on heat pump setting...When starting there is a humming sound but the compressor or fan will not start...Would appreciate a diagnosis if anyone knows the problem.

Duo-Therm Penguin roof top a/c and heat pump Model #630516.321

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Have you checked voltage to the unit?   Same on generator or shore power (to help rule out power issue)?

Next would be to check the capacitors (roof access)-- they help start the fan and compressor.

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I agree with Brett, start capacitor may be bad. Note: if you are unfamiliar with handling and testing capacitors, be sure to short between terminals FIRST before handling! They are capable of giving severe shocks and burns.

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