As soon as you plug the 5th wheel into power they compressor on the air conditioner come on. The unit cools fine, but when the temperature gets down to the setting on the thermostat, the fan goes off but the compressor continues to run. It will run until( we figure the overload shuts it down. After it sets for awhile the compress comes on again and we can not shut it down unless all power is shut of the the camper.
SOURCE: Compressor starts and doesn't stop
Relay for the compressor may be stuck ( Contacts welded) both the fan and the compressor should operate at the same time. Have the relay(s) checked and possibly replaced.
SOURCE: RV air conditioner. Compressor running, fan stops before cool
The fan motor is getting hot and going off on the internal overload in the motor.
This is caused by either a low voltage, a bad capacitor, or tight or dry bearings in the motor.
To check the bearings turn the power off to the unit, then spin the fan blade if it spins freely then the bearings are ok.
To check the capacitor you will need some kind of tester or you can buy a capacitor and replace it, that's what a lot of people do. They usually don't cost very much.
To check the voltage you will need a voltmeter and measure the volts at the unit.
SOURCE: I have a camper with a Dometic rooftop air
no both the options A and B which you gave cannot be done.yes option B is possible in some form.but in this case fan will not shut down and this will burn the fan motor and even make the fan wirings short/.so option B is also not advisable.but the problem is either in the thermostat or in the thermostat shut-off relay.the voltages needs to be checked by meter to confirm the fault. This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya
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