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COMPRESSOR I HAVE A 13,500 DOMETIC ROOF TOP UNIT ON MY RV. THE COMPRESSOR COMES ON EVEN IF THE THERMOSTAT IS IN THE OFF POSITION. IT WILL COME ON AND RUN FOR APPROX 5 MINS. THAN SHUT OFF. IF YOU PUT THE THERMOSTAT ON COOL AND LOWER IT BELOW ROOM TEMP. IT WORKS FINE.
With the thermostat off the compressor will start and run for a few minutes then stop. This cycle continues until the circut breaker is turned off. With the thermostat off the compressor will start and run for a few minutes then stop. This cycle continues until the circut breaker is turned off.
Disconnect the thermostat from the unit. If it continues to do this the problem is isolated to a control inside the unit or a shorted thermostat wire. If it stops doing this the problem is the thermostat.
Disconnect the thermostat from the unit. If it continues to do this the problem is isolated to a control inside the unit or a shorted thermostat wire. If it stops doing this the problem is the thermostat.
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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.
Please reply with Model number of bottom of AC unit ( upper) . Can be seen from inside usually. Thermostat model, plus if controls are at the ceiling assy or at thermostat on wall.
check the compressor winding resistance from common to start
start to run
run to common
the two lowest should equil the highest
also check shorted to ground
check the capacitors the go bad a lot
With the thermostat off the compressor will start and run for a few minutes then stop. This cycle continues until the circut breaker is turned off.
Disconnect the thermostat from the unit. If it continues to do this the problem is isolated to a control inside the unit or a shorted thermostat wire.
If it stops doing this the problem is the thermostat.
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