We have 2 Dometic roof top air conditioners, model 600315321, in our motor home. One has stopped cooling. The compressor is not engaging. The fan runs but no cool air. When we set the thermastat to Cool and flip the switch between Fan and Auto, we hear a clicking noise. This does not happen on the rear AC unit and it works fine, for now. What could it be?? Possibly the capacitor? Or delay switch??
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Check the unit to see if the outdoor fan and compressor are coming on. If not, check to see if power is reaching the contactor, both the high power contacts and the low voltage solenoid. Some contactors can be manually actuated, and a quick press (with a NON CONDUCTIVE ITEM) can show you if the contactor is engaging. If the solenoid is not working, check the wiring of your thermostat. When set to cool mode, there should be voltage on the solenoid of the primary contactor, sending power to the outdoor fan motor and compressor.
If the outdoor fan and compressor engage normally, then make certain the coils are free of debris and other blockages. If air flows freely and the compressor is running, feel the tubing for temperature changes. One side should grow cooler and the other warmer.
If the compressor runs but there is no temperature change, take your unit to a certified technician to check for leaks and system pressures. Roof top units typically use R22 refrigerant not R134a automotive refrigerant, which require EPA certification for purchase and dispensing.
check the and see if the condenser fan is running. you will find it if you take the top off also check and see if the condenser coil is clean. if it is dirty or the fan under the top is not running it will cause the compressor to short cycle on limits or overload.
Depending upon the model of your air conditioner, this may be normal operation.
My newer Dometic air conditioner will run the compressor in a "reverse" mode without the fan occasionally in order to heat the coils. This is done to defrost the coils. After the frost is gone, the fan switches back on and everything goes back to normal.