Question about Ruud UAKA030 Air Conditioner

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A/c making noise

Condenser fan turns on but compressor is trying to start but wont. It takes multiple restarts for it to kick on (by restarts I mean byu the unit itself, after timeout)

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  • ykevin76 Aug 27, 2008

    Could it possibly a bad capacitor? Does the cap. assist the compressor to start?

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Yes the capacitor do assist the compressor, however; your problem may not be with the capacitor if you do not see visible swelling, but check to see if you recieving the actual 24 volts required to start unit. Also the only other reason may cause this sort of problem could be the coil in the contactor is going bad ample voltage problem.

Posted on Aug 27, 2008

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Is the condenser fan (outside) turning? You mention that it's hot but don't say if it's turning or not.

These fan motors normally run pretty hot, but not so much that they shut down due to internal thermal overload protectors.

Both the compressor and the fan have termperature overload protectors to keep them from burning out the motor in the event of an overheated condition. The condenser fan must be running or high freon pressure will put an excessive load on the compressor and it will 'kick out' the high-temp overload protector.

Turn off the unit by pulling the outside disconnect (in a small box near the outside compressor unit) or flip the AC breakers in the breaker box. Wait about 30 minutes for the unit to cool off and turn it back on. If the compressor and fan both run for awhile then kick back off, or the fan motor seems to be working under excessive strain, you've probably got a bad motor start condenser (inside the unit) that little round can that is connected through the fan motor wiring. If it's swollen or leaking, it's almost surely defective and even if it's not, excessive load on the motor is a classic sign of a bad start condenser.

You can usually find these at electrical supply stores, well-stocked hardware stores, or most certainly at an HVAC parts house. Be sure to replace the old one with one of the EXACT same value (in voltage and Microfarads (mF) capacity. The shape may be a little different, but as long as the electrical characteristics are the same and is rated at the same or higher voltage than the original, it will work.

Connect the new condenser, mount it to the frame, and restart the unit. This should take care of the problem.

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