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Marine Air heat won't start


I have a Carver 405. The forward Marine Air unit (VRP 16K) will run in the cooling mode but will not switch on in the heating mode.T he heat light on the Passport II control panel does not come on when calling for heat. I ran the diagnostic test (power switch pressed while turning on the AC power) and the heat runs for its allotted 10 minutes. During the test the heat light on the control panel illuminates as it should.

I would think that the diagnostic is bypassing something while executing the test, but have no idea what?? Since it acts normal during the test it doesn't seem to be the reversing valve, and I would think that the unit itself is OK. Maybe a loose wire, circuit board (however no codes displayed) or the controller head.

Any ideas would be appreciated.

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