Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater
changed batteries in thermostat
Hi, There are so many safety controls on most heaters that are designed to shut down the heater if something like this were to happen. I have only seen this happen once in 33 years where the residents were gone shopping, and the heater did not shut off. The plants were all dead as were there pet bird. I believe what is happening, if the thermostat is good, you have a wire in the thermostat cable touching together somewhere. The Red wire to the White which will cause the unit to run all the time. I would first turn off the power to heater and pull the cover and the front of the stat off to excess the wires. Take loose the red wire and it should shut off after a time delay. If it does shut off then the thermostat is faulty. If it continues to run and heat, look closely at the wires at the stat to make sure they are not touching together some where. Check at the heater also where the stat wires come in to see if they are touching somewhere. If you can't see anything, take the red wire off at the heater where it terminates to unit and this should stop the unit. If it does you will know that the wiring from the heater to the stat is touching in the wall somewhere. We use an ohm meter to check continuity on the wires to see which ones are touching. If the heater continues to run with the wire disconnected from it, depending on the age of the unit and if it has a circuit board on it, it would have a shorted connection from hot to w or heat. I would say you have a faulty stat and or wiring touching somewhere calling for heat to be on all the time. This is all it can be. Do the checks I have said and keep me posted on how you are doing. I will wait to hear back from you.
Posted on Jan 18, 2010
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Posted on Jan 02, 2017
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