A/C compressor will not shut off

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Old 02-02-14, 08:26 AM
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A/C compressor will not shut off

My A/C compressor turns on as soon as the breaker is turned on, even with the system set to off. I suspect a bad thermostat, but I'm not sure. Also I'm not too familiar with digital thermostats. The last time I worked on gas furnaces, everything was mercury switches. It is a Trane XR-13 system and a Trane thermostat.
 
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Old 02-02-14, 09:27 AM
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Welcome to the forums.

With the thermostat set to off..... I doubt it's bad. Most electronic thermostats unsnap from a wiring wall plate. Did you try that ?

It sounds more like you have a stuck/burned contactor in the outside unit.
Are both the compressor and outside fan coming on ?
 
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Old 02-02-14, 09:38 AM
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Yes they are both running
 
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Old 02-02-14, 10:11 AM
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Did you try removing the thermostat from its base ?

If you did and the outside unit is still running.... you'll need to focus your troubleshooting on the compressor unit as it sounds like a contactor issue.
 
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