Sometimes the outside unit, the fan will stop spinning and you can feel the fan motor getting hot and have to shut it off. other times, it seems to be working fine and suddenly realize it is no blowing out cold air anymore. have tried using the reset button, will work fine for a day or so. the unit is only 2 1/2 years old.
do i need a new fan motor, or could it be something else?
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I would bet the outside units contactor is bad. This is the device where the two thermostat wire connect outside. If this is pulling in/out as you turn the stat on/off then it is working. I just fixed one yesterday with the same symptoms and found the start capacitors were bad. If they are bulged at the top or bottom then they are bad. Good luck.
When I am called to replace a outdoor fan motor I charge $330.I am in las vegas and the charge varies form company to company.The fan motor itself is approx $80 my cost(230v 1 phase condenser fan motor).
First check for line voltage 240v...if thats good .check for burnt wiring at fan capacitor.if you hear the compressor humming but still no fan you may need a fan motor.. when buying your new motor make sure to match horsepower and r.p.m
Sounds like you need to recharge it .. To tell while the unit is running go outsiode and feel the large insulated copper line going to the unit it should be cold to point od sweating like a can of coke you take out of the refrigerator and sit on the counter. also feel the air coming out of the unit outside it should be warmer than the outside air if not your freon is low
If you are running the unit in the A/C mode with the fan in the automatic position it could be the cause of the freezing of the coil. Try operating it with the fan in the on position and see if the problem goes away. When in the automatic operation the fan shuts off when the cooling unit shuts off and air circulation stops. Hence no defrosting of the cooling cycle in the off cycle. In the evenings when the outside temperature drops after sundown the pressures in the system drop in proportion dropping the temperature of the cooling coil sometimes causing ice formation on the cooling coil.
Even when the power is off at the unit outside the thermostat will supply power to the contactor of the outside unit. This may give a hum or buzz as you stated. If when the power is on to the outside unit the fan tries to start but only hums the motor may be bad. Does the compressor start and run?