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A/C Thermostat not getting fire

I have an older York A/C system. Over 2 months ago I turned the switch on at the thermostat, it came on momentarliy and then off. It would not come back on. I checked the circuit breaker box and all was fine. I went outside the unit and reset that switch. I wonder if I will have to replace the transformer that reduces the current from 120V down to 24V on the unit. I replaced this already and it has hardly been three years.
Thanks for any troubelshooting advice!
Randy in NC

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Try replacing the thermostat there have been a bad batch of them lately. Get an inexpensive one and if you have the mercury switch the solder inside the bulb may have fallen off.

Posted on Jun 19, 2009

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Posted on Jan 02, 2017

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