Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater
Your problem may be at the furnace control end and not your thermostat. To determine that, simply unhook the two wires from your thermostat so that they do not make contact. When they are electrically opened like that, your furnace should shut down. If it doesn't, then the problem is at the furnace control board. You may have a relay that is staying on even when power to it is disabled.
Hope that helps...
Posted on Nov 28, 2008
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Posted on Jan 02, 2017
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