Question about Heating & Cooling
You may have a faulty stat. It could be several things, but this is the 1st place to start. Remove the front section of the stat to get to the wires. You will see a red, green, white, yellow, and if its a heat-pump more. You say furnace, so I'm sure its gas fired and not a heat-pump. Take a piece of jumper wire, insulated and hold one end to the red connection and the other to the white which is heat. It may spark on you, but don't be alarmed as it is a very mild 24 volts and will not harm you. Have someone listen to see if it starts to ignite. If it does and comes on, your stat is faulty. This is a very simple test we always do 1st. If it does not make any difference, check for power going to the stat. Take the red wire coming in and touch it to the w, or g terminal to see if it sparks or the fan comes on. If not, you have lost power in the furnace unit. See if you have a small control fuse in a circuit board that may have blown, this depends on the age of this unit. It looks like a auto fuse, 3 to 5 amps.If the fuse is good, make sure you have high voltage to the unit. You may have a breaker tripped. Please keep me posted. Thank you,
A/C, & Heating Contractor
Posted on Apr 10, 2011
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Posted on Jan 02, 2017
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