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My Trane ModelTCONT402AN32DAA thermostat set for 75 degrees overshoots to above 81 degrees (as measured by a reliable thermometer). The thermostat temperature indicates 75 degrees and the heatpump will only turn off by manually reducing the temperature setting to a lower temparature. This is in the Heat mode but it does a similar "malfunction" in the Coolinf mode.

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I would remove front cover and see if your thermostat has a mercury switch.this will be a small vial connected to a bimetallic coil. The vial wiil be about 1/3 full of mercury. It will have a brite silverey appearence.There shoul be two leveling peg on inside of thermostat. Check the level with a torpedo level. it should be very close to level. If not loosen mounting screws that hold stat to wall and gently move base till you have it level. Hold base steady and tighten mounting screws. This should help thermostat setting and actual temperture to be closer. It's not unusual for setting to be off by several degrees.

Posted on Nov 15, 2010

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