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Thermostat set at 71 deg overshoots to 74 deg

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  • Anonymous Dec 06, 2008

    the thermostat that over shoots from 71 to 74 is honeywell T8865A Chronotherm (wireless).the heating system is steam.

  • serco 2000 May 11, 2010

    What king of heating do you have?

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If its a mercury bulb stat it must be perfectly level. or it will overshoot or under shoot depending on which way it is out of level. the heat anticipator under the cover if its an older stat should be .4 to .6 or it will over shoot. that is what lets it know that by the time it shuts off burner or strips and cycles down the fan it should be at the desired temp. if its digital be sure the hole in the wall behind it is sealed 100 percent. even a little cold or warm air leaking into the back of the stat can cause faulty readings and over or under temps. if this doesn't correct the stat itself may be bad and in need of new. good luck.

Posted on Dec 05, 2008

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Posted on Jan 02, 2017

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