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My thermostat won't turn on - Heating & Cooling

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You need to see if you have power to thermostat. If you have a volt meter /multi-meter and know how to use it you can check it.Remove cover from thermostat and see if it has a mercury switch. This will be a small glass vial that is connected to temperature setting lever. if you move heat setting up or down the glassvial will move with it and you should see a small spark inside.I should back up here because I assumed that you have a older style manual thermostat. If you have a programmable t-stat disregard . Either way if you are sure you have your t-stat in the proper position to call for heat and it's not working. If you are mechanically inclined you can carefully remove cover from t-stat and remove 3 or 4 small screws that mount it to wall. Be careful as the control wires are very small and may break, carefully remove red and white wires . The terminals should be marked as R and W. If you jumper red and white wires together furnace should come on. If you have a multi-meter you can check for voltage across r and w withot removing from t-stat. You should have about 24 volts a.c. If you have proper voltage or if unit works when you jumper r and w then you need to replace thermostat.If you don't have proper voltage there you will need to check transformer,control board or wiring. Hope this helps. Thanks.

Posted on Nov 07, 2010

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