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furnace fault

bernie_5
bernie_5 Member Posts: 2
in THE MAIN WALL
FURNACE FAULTS OUT AFTER REACHING SET TEMP ON THERMOSTAT.MAIN BLOWER&INDUCER BLOWER STAY RUNNING. MANUAL SAYS THIS INDICATES THAT FLAME WAS SENSED WHEN THERE WAS NOT A CALL FOR HEAT.WITH THIS FAULT CODE THE CONTROL WILL TURN ON BOTH THE INDUCER MOTOR AND SUPPLY AIR BLOWER.THIS FAULT WOULD TYPICALLY BE CAUSED BY A GAS VALVE THAT LEAKS BY OR IS SLOW TO CLOSE.I PUT NEW GAS VALVE ON STILL HAVE SAME PROBLEM.HELP,THANKS IN ADVANCE

Comments

  • hvacfreak
    hvacfreak Member Posts: 439
    hmm...

    gas valve is getting voltage when it shouldn't...board ? / Save that old valve.
  • Dale
    Dale Member Posts: 1,317
    check stat and paperwork

    If you have not aready done so check the stat. I would take the 4 or 5 stat wires off the furnace terminal strip and just jumper R to W to start the call for heat and then just take the jumper off to see if the problem repeats. Also, it is normal for allot of furnaces to have the blower and inducer run for awhile after a call for heat ends, the blower to cool off the heat exchanger and the inducer to post purge to dry out the heat exchanger and intake air box.
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