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Old 07-08-2008, 08:44 PM   #1
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Trane System - AC compressor/fan doesn't turn on always


My system sometimes just blows ambient air - doesn't cool. I went out and checked and sure enough, the compressor and fan wasn't running outdoors. This is not a heat pump system.

If I go into the basement and turn the switch off next to the air handler, then turn it back on, the compressor and fan start up.

This has been going on ever since I moved into this new house 10 years ago, but usually only happens twice or three times a year.

It has done it 4 times in two days now.

I had to replace the board in the air handler after a lightning strike 1.5 years ago but this changed nothing. At that time there were no leaks and didn't need any refrigerant.

Any ideas?

Thanks.

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Old 07-09-2008, 06:56 AM   #2
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Trane System - AC compressor/fan doesn't turn on always


I'd check the obvious first, bad thermostat switch contact, bad t-stat wire, loose connection. I've seen some instances where, when the wire was stripped, it was nicked and the wire broke in a wirenut or terminal and it was just touching enough to make contact, if it moved the slightest, it would open.

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Old 07-09-2008, 04:26 PM   #3
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Trane System - AC compressor/fan doesn't turn on always


With a progressive problem my first thought is a weak capacitor . Everything the other guy said is just as likely
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Old 07-09-2008, 07:12 PM   #4
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Trane System - AC compressor/fan doesn't turn on always


Have you checked the board in the condensing unit? Sounds to me like its locking out on a high or low pressure switch. Is the condensor coil clean? Next time it happens try and locate where you are loosing 24 volts. Trace the wires backwards from the contactor to the compressor protections. By turning the power off to the air handler you are resetting the condensor lock out board.
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