Question about Heating & Cooling
You will need to do additional trouble-shooting. This could be a faulty thermostat, a broken wire at the thermostat or a problem with the furnace. At the thermostat, check that the wires are fully seated at the terminals. Make sure that the conductors haven't broken. (I've seen the wires break after they weakened.) You can try placing a jumper between the terminals for heat and ground. (For a single-phase forced air system, the Rh wire calls for heat.) If your system has a C (common) wire, make sure that the voltage is getting back to the furnace. You can try a different thermostat.
Also look at the furnace. Some systems will have an LED indicating a problem with the unit. Gas systems can have a problem with the flame. Gas or electric forced air systems could have an issue with a blower. Heat pumps can freeze up if the temperature is below their operating range.
I hope this helps. Please add a comment with the manufacturer and type of furnace (oil, gas, steam boiler) that you have if you need more ideas for trouble-shooting.
(my own gas furnace went out on Wednesday and was temporarily fixed by resetting the thermostat and using a jumper across the appropriate terminals. The flame didn't come on at 6 A.M. when the thermostat called for heat. Today, the blower completely failed and needs to be replaced. The earlier failure is likely to be related to this failing blower motor. When I followed the manual's instructions for testing the system, I got a "needs service" code. However, the unit didn't display a trouble-code before I did that test.)
Posted on Dec 17, 2016
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Posted on Jan 02, 2017
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