Question about Goodman GMS90703BXA Heater

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Furnace problems light flashes three times. motor in i.d.blower buzzing+not turning

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  • ray ski Jan 23, 2008

    furnace not firing up

  • Anonymous Mar 13, 2014

    Furnace does not light

  • Anonymous Mar 13, 2014

    My furnace does not start light flashes three times



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On - OK
1 Blink - Ignition failure. Check Gas flow, gas pressure, gas valve, flame sensor.
2 Blinks - Closed pressure switch. Check pressure switch (stuck in closed position).
3 Blinks - Pressure switch - failre to close. Check venter, pressure switch, vent blockage.
4 Blinks - Open limit switch. Main limit or aux limit are open. (My comment - Means overheating in chamber. Often result of blocked intake air. Bad filter. In my case, plastic wrap had been sucked into the intake. )
6 Blinks - False flame sensed. Check sticking gas valve.
Rapid continuous blinking - Incorrect twinning, incorrect primary polarity. Reverse transformer secondary leads, reverse primary wires.

Closed pressure switch can be from dirty combustion vents, bad chamber pressure - like missing screws, maladjusted gas pressure, failing pressure switch, loose hoses, moisture in the hoses or fan blades The switch need to be closed to ge the unit to work

Posted on Jan 23, 2008

  • 1 more comment 
  • Gary Davd
    Gary Davd Jan 23, 2008

    one other thing to make sure of is the outside vent is not clogged go out and when the unit starts up see if you are getting a strong exsh. air if so we need to look futher inside the units pressure switch let me know what you came up with also by shutting the pwr off to the unit it will clear the fault but if it trys to loight and fails 3 times it will go back into the fault mode

  • Gary Davd
    Gary Davd Jan 24, 2008

    Did this solve your problem???

  • Gary Davd
    Gary Davd Jan 25, 2008

    Please let me know if you need more information on this job



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