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We had an AC tech change out the motor to the fan in the outside AC unit and a new compacitor. When it rains the motor does not come on (the compressor comes on but not the fan).

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Weird!?! The only possible cause for this that I can think of is that the tech did not install the correct motor for an outdoor unit. Condenser fan motors are essentially sealed, it will look like a metal cylinder with a shaft sticking out one end and wires out the other. A motor intended for indoor use will have slots in the outside case to facilitate ventilation. Take a look and see if you see slots in the case of the motor where you can see inside to wires and the internal components. If you can, then you have the wrong motor, if it appears to be sealed to keep out the weather, then I haven't got a clue what it could be without getting my hands on it. Keep in mind that I am a service tech that usually diagnoses the equipment when it is in my presence.
Thanks,
Chillmaster

Posted on Jul 04, 2008

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My outside unit is making a loud weird noise but the inside unit is working completley fine it is 7yrs old now


the outside unit is where it all happens. That is where the compressor is and its cooling fan. The inside unit is just an evaporator, a bit like a car radiator and a fan. The inside unit is protected by the room, the outside unit is in the rain, snow and wind.

You need an AC engineer.

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If the fan blade turns freely - then you might check the capacitor (small electrical device attached by wires to the fan motor) and see if all the connections are tight and complete and that the capacitor itself is not bulged.
If it's 'bulged' that is a good indication that it's bad and that could be your only problem.
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I would guess that the motor is pulling to many amps, it could be to small (not the horse power as should be), could be bad incorrect fan blade (to many blades or pitch on blades) over loading the motor. I have seen fan motors get to hot and stop from a dirty coil. Take a garden hose and a nozzle use a solid stream carefully watching the fins don't bend by high water pressure. Throughly clean the coil every inch or it. Hope this helps.

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Hi!!

This means that the condenser fan motor (outside unit) failed, this caused to build hi pressure and either activated a safety valve to release the extra pressure or blew a line and R22 Refrigerant escaped from system.

The fix is to replace motor fan and capacitor find the leak and refill system with R22 Refrigerant Gas. It is safe to turn on the Fan Only mode on the Thermostat until a HVAC Tech arrives.
To perform this job parts and labor included will cost: about $300 -.$400. Look on the Yellow Pages for a Tech in your neighborhood.

Good Luck!! Don't forget to Rate this post!!

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1 Answer

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the motor could just be locked in place from sitting...take a stick or something and try to see if it spins be sure of rotation! you can also give it a little nudge while it is on and it will take off! if this happens then you have a bad start compacitor but no there are no fuses that only protect the motor!

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Condenser fan motors not working properly after sitting idle for several months is a very common failure. moisture collects and causes rust, bearing freeze and so on. Often simply using a tool of some kind to spin the blade slightly is enough to break the motor free and allow it to start, however, this seldom resolves the problem completely. The motor needs to be oiled and the capacitor checked and replaced if needed. In my opinion it is better to just replace the motor with a sealed outdoor rated motor with the appropriate rain guards rather than waste time on a questionable one Be sure to have the unit serviced every spring so your not caught of guard when all the techs are busy.I hope this helps GL!

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