Question about Heating & Cooling
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Posted on Jan 02, 2017
1) Turn the fan to on and if it runs you know that you have line
voltage to furnace and 24volts to the thermostat.
2) You could turn the furnace off remove the doors and get to the
control board. If you can find the Thermostat wires on the board
mark and remove them. If you have a typical Furnace and you
have some electrical background put a jumper wire between
terminals R and W,put the doors back on-there is a door switch
that if the panel is not put back on-it will not run. Turn your power
3) The Blower motor may come on, the induced draft blower should
come on, the glow coil should glow, the gas valve open and the
burners should come on and the unit should run.
4) If all of this happens, then you have a thermostat problem or you
have bad thermostat wires.
5) If nothing happens then you don`t have power to the furnace or the
little fuse that protects the transformer is blown.
Posted on Jan 08, 2010
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