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After ensuring power is going to unit, I would be looking at either compressor or thermostat or control board. If compressor is not running at all, not even clicking, then board or thermostat is most likely the problem. If compressor is running or trying to run, then starting device for compressor or compressor itself is bad.
Cooling will only take place when the compressor is running. If not running check to see that unit is receiving power at power plug - then check to see if motor is receiving power at input terminals - if it is, make sure that the starter capacitor is working (that starts the compressor from a dead start).
If no power reaches the compressor make sure that the thermostat circuit is working properly and getting power to the motor windings. If the defrost timer is stuck in the open position, no power will reach the compressor and or associated fans.
You can check the compressor contactor to see if the compressor contacts are welded together. You can check for control voltage to the compressor contactor, no voltage should be present to the solenoid part of the contactor. You can check thermostat connection terminal Y1, it should not have any voltage to C. What power you turning off that will not cut the compressor power?
Check power to and from thermostat and to compressor relay. If compressor powered but not running, compressor fault. If compressor running but no heat in condenser, short of gas. If compressor running and heat only in first rungs of condenser, compressor poor pumper and needs replacing.
If this is a conventional split system, ohm the compressor motor windings and/or check the run capacitor. Before doing so check to ensure there is power present at the compressor, and if so, then turn off power and proceed to the testing, but not with power on.
7 horsepower is approx 5150 Watts so the compressor would be taking this power while running. On startup however the compressor can take a surge of upto 3 or 4 times this power so the generator wouldn't be able to supply this demand . In any case it's not advisable to run a compressor off a generator unless the generator is high powered, 20KVA or greater for 7hp.
If the fans run we know it aint the defrost timer and you are getting power to the compressor so that means you have a wire done burned off one of the compressor terminals hopefully or ya might need a compressor. Probably just a burnt wire. These are pretty tough units. Diagram and run info
Good day, Sorry, no reset but if the compressor is not running, it could be the thermostat as well. You will need a VOM meter to check to see if power is reaching the compressor. If it is, it could be the compressor overload protector, the compressor start relay, which are both under a cover on the side of the compressor.
There could be the compressor capacitor is damaged.Sometimes on the duel capacitiors they will still run the motor,but doesnt have enough power to turn on the compressor.Or the compressor could be bad.
check light inside .on? you got power. check compressor in back on? if no then you probably have a bad stat. open door and look inside for numbered dial. turn max hot to max cold back and forth. if compressor comes on you need a new stat probably. remember only a stat a compressor on these units. if its hot stat should send power to compressor. if power is arriving at compressor and not running then start relay and or start cap are probably bad. but if compressor is running and still no cool then your probably out of freon. unfortunitly these boxes are made with steel tubing in the cabinets. when you move them lots of times the tubing rusts and ruptures. then your all done. new freezer time. they are sealed to the point there are not even a place to apply gages to check charge. you can gently remove power and then stat and jump thermomstat to take it out of equation and if compressor runs you need a new stat. constant power comes in one side of the stat and when the sensing tube is heated it closes the points to the outlet side and puts power to the compressor. there may also be a ground wire usually green be sure to observe which two are power in and power out. usually side by side. good luck
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