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Hi I have a CLT30-1A external air conditioner unit. Problem: both the fan and compressor do not turn. A low frequency hum sounds when power is applied. Trouble shooting steps I've tried; 1. contact switch works and supplies 220 VAC across contact to motors 2. removed each motor from the circuit at a time but neither motors function. I speculate the capacitor is not functioning and does not "start" either motors. What do you think?

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  • charles895 Aug 02, 2010

    Thanks. There is no timer unit between the mains and contact switch unit. I figure it is the capacitor. Thanks so much.

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Hi,

If your contactor is engaged, as it sounds like it is and you have 220 volts going out of it. Then the capacitor would be the device to look at next.

An ohm meter test on both sides of capacitor should show its condition. In your case I would guess the common terminal is bad (open).

There is another device added on to some units, this would be a time delay. Where it pauses up to 10 minutes before letting the compressor and fan start. This prevents short cycling. Carefully follow the wires to see if there is such a device between the contactor and main wires. If not then you are left with the capacitor again as the logical failed component.

Let me know if you have questions.

Phil

Posted on Aug 02, 2010

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