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    ttravi02's Avatar
    ttravi02 Posts: 1, Reputation: 1
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    #1

    Mar 29, 2006, 05:22 PM
    Central heat
    The other day my central heat quit blowing hot air. I can feel cool air and the thermostat will be set at 72, but the temperature never raises higher than the temperature of the house. Does the thermostat need to be replaced or is it a wiring problem or something wrong with the actual heater? I can feel the air blowing, but it's always cool air. What do you think is the problem? Do you think it's an expensive problem to fix?
    semenzato's Avatar
    semenzato Posts: 3, Reputation: 1
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    #2

    Mar 29, 2006, 06:35 PM
    Quote Originally Posted by ttravi02
    The other day my central heat quit blowing hot air. I can feel cool air and the thermostat will be set at 72, but the temperature never raises higher than the temperature of the house. Does the thermostat need to be replaced or is it a wiring problem or something wrong with the actual heater? I can feel the air blowing, but it's always cool air. What do you think is the problem? Do you think it's an expensive problem to fix?
    There is a small chance that the thermostat or the wiring is bad, but more likely something is wrong with the furnace. A simple check you can make is to pull the thermostat off the wall (there may be screws, or it may be a snap-on model) and see how many wires are connected to the thermostat. If there are only two wires, then you have a problem with the furnace for sure.

    If there are three or more wires, then you can still do some testing yourself, but it gets more involved. You would need to find the thermostat installation manual on the web, and figure out which wire controls the fan and which one controls the heat. (The wires may be color-coded but it's not guaranteed). Then by temporarily shorting the appropriate wires you can try to start the furnace. If you are extremely lucky and manage to start it, then you only need to replace the thermostat. I am only describing this vaguely because it's not clear you want to do it.

    More likely you will need to call for service at this point. Unless you forgot to pay your gas bills and they turned of the gas, or the gas supply has been shut off otherwise. I don't think the repair would be terribly expensive, depending on what part is broken, but service is not cheap either.

    Luigi
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