Question about Dometic Rooftop RV Air Conditioner

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I have a penguin rooftop ducted system with analog thermostat, the thermostat board went bad, so I got a refurbed one, installed the refurbed one, but when I switched it on , no leds, nothing after about an hour the system tried to start, but didn't. No leds lit. I switched to High fan only, and same thing. Whats up? there is 12v to the board.

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If you have no leds, then you have a power supply problem. I am assuming that you have the Dometic Electronic Control Thermostat with the ribbon cable connection. Check for 12V power at the control board in the air conditioner, Red 12V+ and Black 12V-. Make sure polarity is correct. If you have power there then check the number 1 and number 10 pins on the ribbon. The voltage should be the same. If they are not, then you have a bad control board, not thermostat.

Hope this helps,


Posted on Jul 03, 2009


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Bad run capacitor or bad compressor. If you hear an occasional click from the compressor try a new run cap and then a hard start kit. Otherwise it's more economical to purchase a new unit.

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moz-screenshot-2.jpgmoz-screenshot-3.jpgThe reversing valve is energized in the cool mode of these AC's. So there is no real way to bypass it. I would check the thermostat and the control board in the unit to make sure that the switches are set correctly.

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Hope this helps,


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Jul 06, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

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When you turn the thermostat to fan, do you hear an audible click in the control unit of the ac? If so, then you know that the thermostat is sending 12V to the fan relay on the board.

I think the motor just may be frozen up. Try spinning the motor by hand and see what happens. Again, if it starts, then just lube the shaft points on the motor with some WD-40 and all should be fine. If the fan motor starts and then after the cycle, does not restart, then you definitely have a bad capacitor.

Hope this helps,


Jul 03, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

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if it isn't destroyed you could have it brazed and charged,if it is bad try ebay,i have good luck there with hard to find parts

Jan 08, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

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Did you try contacting Dometic directly, to speak to a technical assistant. ( )

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