Question about Dometic Rooftop RV Air Conditioner

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Ac was not cooling very well,breaker was hot -turned off-reset breaker-ran and cooled good, but would not shut off,the remote would not work-turned breaker offto stop unit -Now nothing works,manuel controls or other wise,breaker checks ok ,it is incorporated with hot water heater,which is 15 left side,ac 20 amp breaker right side.

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Turn the breaker on and remove the cover from the A/C and check for proper voltage coming into the unit. If you don't have it the circuit breaker may be bad. If you do have it, set the thermstat to make the A/C try to come on and check the contactor to see if it is pulled in. If it is pulled in, check for voltage on the load side of the contactor. Also check the condition of the contacts, make sure they aren't really burnt or pitted. If it isn't pulled in, check the output of the low voltage transformer. It should be 24vac. If you don't have it verify you have power on the primary side of the transformer. If you have power on the primary and none on the secondary the transformer is bad. If you have 24vac, go to the thermostat and install a jumper between R and Y. If the contactor pulls in with the jumper installed then the thermostat is bad. If the contactor doesn't pull in with the jumper installed, check for 24vac on the contactor coil. Notice you will have line voltage on L1/L2 and low voltage on the coil so use caution. If you have 24vac and a jumper installed and the contactor still isn't pulled in then the contactor is probably bad. You can also check for low or high pressure switches. If the contactor and thermostat is good then check your capacitor. Let me know what you find and I can give you some more suggestions.

Posted on Sep 06, 2010

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