Question about Heating & Cooling
That relates to a pressure switch fault. Unless you own, and know how to properly use a manometer this could easily be mis diagnosed. You have a combustion blower inside the top cabinet, and coming off either the blower assembly, or the cold end header box it's attached to there will be a round plastic pressure switch. It will have 2-3 wires, and 1-2 plastic hoses coming off. Depending if it's a single, or two stage model it may have two pressure switches, one for low fire, and the other for high fire. The switch will have a rating in "WC on it. If there's one hose going to the pressure switch, remove it from the pressure switch and attach it to a manometer. If you read a bigger number the switch is bad, if it's lower look for blockages in the vent, and intake pipes. If there's two hoses off the pressure switch then the difference in pressure has to be greater than the rating on the switch. Good luck!
Posted on Apr 19, 2013
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Posted on Jan 02, 2017
open the top of your unit so that you can see into the burner box
what your looking for should be an orange wire that leeads up to a metal rod
that metal rod should be in the way of the flame when unit is on
this is your flame ground,,, or more commonly known as the flame sensor,,, take this out and goive it a good brush with some steel wool
this should clear up you problem
Posted on Nov 04, 2009
Check for 24 volts across the two terminals on the gas valve when the ignitor glows. If yes, bad gas valve or blockage in the gas train. If no, bad ignitor or circuit board. Even if the ignitor glows, it still may be bad and not sending the proper signal to the board. If you jump the R and G terminals on the circuit board, does the fan still only run for 90 seconds? If so I would say replace the board.
Posted on Dec 28, 2009
Check to see if the blower motor is actually getting power to it...You will have to check for power on the heating speed terminal... and the neutral wires....you should have 120v across those two wires....
If you have power then the motor is bad...if no power then the heating relay went bad on the circuit board and you will have to replace the circuit board...
That is a common problem as those relays are often to light and wear out...
Just realize that without an electrical meter to trace things through you are really just grabbing at possibilities and not really able to correctly diagnose your problem...
Posted on Dec 08, 2010
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