Model 620215 low profile and 595 quick cool onsame motorhome ,95 nemar country aire,both units the fan slows down for about 1 to2 seconds about 77 volts on fan lead, comes right back up to speed ,does not stop,happens on all speeds! also the quick cool, the fan and compressor stops compleatly for about 1 to 5 seconds, fan comes on and compressor restarts after the time delay a relay clicks at rooftop circuit board when it starts am a electrician for 40 years all conection tite and clean voltage 115to120 volts happens on 30 and 50 amp service,ducted air w/wall stat #3104999.002 w/green lights top center hoizontal temp slide help!!! marty 630 244 4415
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SOUNDS LIKE A OVER HEATED CONTROL SWITCH THE SWITCH THAT CHANGES HIGH, LOW FAN, HIGH COOL, LOW COOL. REMOVE INSIDE CEILING SHROUD AND LOOK AT SWITH FOR BURNT TERMINALS OR LOOSE WIRES TURN OFF POWER FIRST AT BREAKER.
WHEN A COMPRESSOR FIRST STARTS TO RUN THERE IS AN INITIAL HIGH STARTING CURRENT(30 AMPS PLUS),BUT THIS SHOULD DROP BACK DOWN TO RUNNING CURRENT PRETTY QUICKLY.IF IT MAINTAINS THIS HIGH STARTING CURRENT FOR A WHILE THEN THIS GENERALLY INDICATES THE COMPRESSOR AT FAULT,BUT!!!!! ALSO CHECK TO SEE IF THE FAN IS NOT SEIZED. DISCONNECT THE FAN ELECTRICALLY THEN RUN THE UNIT. IF THE STARTING CURRENT MAINTAINS APPROX 6 AMPS THEN THE FAN IS AT FAULT!........HOPE THIS HELPS!!
If a fan motor quits working during a cycle it usually means that the thermal protector is turning it off. If you had an amp meter on it, you would notice that it is exceeding the listing on the nameplate, Nine times out of ten this is irreversable, the motor needs to be changed. Sometimes if there are oil ports on the motor, you can add a few drops of zoom spout oil and that does the trick. But usually the motor is already damaged. Good luck.
Is the unit ducted with a wall mount thermostat? If so, then I would say that you need to check the thermostat. Remove the face plate from the thermostat, there should be 6 or 7 wires, depending on the model. With the thermostat set to high/cool, check for power at the yellow wire and the blue wire. Yellow is the compressor terminal and blue is the high fan. If you have no power at the blue terminal, then you have a bad thermostat. If there is power there, then you need to access the control unit in the air conditioner (remove inner shroud). Check for power at the blue wire at the control unit. If there is power, then you have a bad control unit. The unit is shutting down because it is freezing up in the low fan speed position. You can use a jumper wire on the thermostat to go from the +12 terminal (red wire) to the Hi Fan terminal (blue wire) and also the fan terminal (Either tan or orange, depending on the model). If the fan comes on, then you have a bad thermostat. If not, then you have a bad control unit or the high speed in the fan motor is out.