Replace the thermostat. Not an uncommon problem. Although there is an adjustment if you remove the thermostat knob and look in the hollow knob shaft where you'll see a place for a precision flat head screwdriver, I have generally found that if the thermostat was working properly at some point, the problem is rarely fixable by adjustment.
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Replace the thermostat. Not an uncommon problem. Although there is an adjustment if you remove the thermostat knob and look in the hollow knob shaft where you'll see a place for a precision flat head screwdriver, I have generally found that if the thermostat was working properly at some point, the problem is rarely fixable by adjustment.