Question about Dometic Rooftop RV Air Conditioner

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Hi cool or high fan still not working the back unit is the same unit.

So I used the following parts from the rear unit one at a time and tried it each time with no luck (Yet.)There are three small tube looking electrical units that all are like the capacitor in the same place. I replaced all with identical ones one at a time no luck. then I replaced the fan motor with the identical one . No luck. Then I took out a box that has the main power to it and 4 colored wires and a thermostat wire and replaced it with identical one No luck then a small little black electrical diode looking thing and replaced it no luck.Has to be the Control board in house or compressor.Which one do you think?

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Yes but the high fan and high cool fan does not come on to flow air anywhere except on low cool or low fan.This occurs with Generator on or shore power. Are you refering to a circuit board that is in the house inside the filter cover?

Posted on Jun 25, 2008

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It looks like a control problem with the thermostat or relay board (if you have a wall mounted thermostat). If the compressor is coming on, then you need to look into the airflow of the unit. Whether or not the compressor is coming on, you need to check the voltage. Like every appliance on board, the air conditioner needs adequate power to operate. If the voltage is 110 volts a.c. or below, the effectiveness of the unit will start to suffer. After verifying correct voltage, we need to look at how the air conditioner does it's job- it requires adequate air flow over both the inside (evaporator) and outside (condenser) coils. If the air filter is clogged refrigerant will not be able to pick up enough heat from the inside air, and if the condenser coils are blocked by leaves, it will not be able to give off enough heat to the outside air.

Posted on Jun 25, 2008

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High cool not working

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2 Answers

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Pls check the following....
1) Fix the wire connector to Reversing vale
2) Check the Capacitor if this a low capacitance or (open) not function using Multi-tester.
3) Check the Selector switch if this is not function using Multi-tester . or check the PCB Board (if electronic your units) replaced the Board.

If not yet,go to the nearest repairman to repair that units.

Thank you,have a nice day.


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