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Furnace will work for about 6 hrs only in the morning.It won't work at nights at all.Furnance will turn on for a second or two and will turn off.

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I can't think of a reason why mornings would be different from evenings except if the thermostat is computerized and not working right.
If you have a simple 2 wire thermostat, because you don't have air conditioning, a heat pump, zones, or anything complex, you can just short the thermostat wires together in order to force the furnace to work.
Three or four wire is more common, and you need to be more careful:

  • Red to the thermostat RH or thermostat RC terminal
    The red wire is the source hot wire from the transformer.
  • Green to the thermostat G terminal. This is the color that controls the fan or the relay that control of the blower.
  • Yellow to the thermostat Y terminal. This is for control of the air conditioning.
  • White to the thermostat W terminal. This is for control of the heating.
So then you should be able to bypass the thermostat with red to white. Then the furnace will turn on the fan as well, once hot enough.

If you have anything complex, don't risk it, and call someone.

Posted on Dec 29, 2010

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