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Furnace is cold. Will not ignite no matter what the thermostat is set at.

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  • Chandler Ede
    Chandler Ede Apr 09, 2011

    Tell us what make and model number the furnace is and we can help you

  • Rich Landrum Apr 09, 2011

    It would help to know what type furnace you have (Manufacturer, Model number and fuel type) to be able to help you.

  • Chandler Ede
    Chandler Ede Apr 09, 2011

    OK, tell us the make and model number of the furnace and we can help you!

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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,
Shastalaker7
A/C, & Heating Contractor

Posted on Apr 10, 2011

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