I have an old sears murcery thermostat, I moved it to a new location 5' over now when Its turned on it acts as a switch and doednt respond to the temp.. Any ideas?
Make sure the stat is level the mercury slides back and forth in the tube acting as a switch if the stat is not level the mercury wont move correctly when the coil spring twists
Check to be sure the spring isn't binding in some way preventing it from moving freely. It is possible the mounting screws may be too tight deforming the plastic a little. Also be sure it is absolutely level. It is critical on the mercury type thermostats.
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