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Goodman Gas Pack Unit. Model PGB048125 Control Board 1068-400 Installed 1993. ** No Heat. ** Checked breaker at box. ** Have changed thermostat, no change. ** control board LED light shows: Red: System turned off at thermostat Red: A/C turned on. Flashing Red: Heat turned on at thermostat.

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  • rswanson_rjb Nov 02, 2010

    Thanks for the info. The manual says the blinking error light (red light) blinks either 1, 2, 3, 4, 5, or 6 times in a row for specific problems. Mine blinks on and off continuously in the 'heat' mode. The inducer motor never starts.

    I am wondering if it could be the control board itself, though the manual says the light should shut off if there is a board error.


  • rswanson_rjb Nov 05, 2010

    Tried the listed items. It turned out to be a problem with the exhaust motor.




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Count the number of flashes and consult your manual as to what the flashes mean. The blower access door may show the faults codes. What you probably have is a contaminated flame sensor or maybe a rollout switch tripped due to rusty burners or air restrictions in your heaters vent pipe. Or a cob web blocking the tubing between the proving switch and inducer fan. Use a dry brillo pad to clean the flame sensor. Check the reset buttons on your limits clear cobwebs out of vents clean rusty burners. This video shows a typical new fangled gas furnace in action:
This video shows how to clean that pesky flame sensor:

Having an understanding of how they work can help you duagnose any of these late model wonders.

If you need further help, reach me via phone at

Posted on Nov 02, 2010

  • Dan Webster
    Dan Webster Nov 02, 2010


  • Dan Webster
    Dan Webster Nov 02, 2010

    Their can be as many as 5 of theses on one furnace. They are on the burner under the burner on each side of the burner and in the burner smoke stack. They are called rollout switches because they monitor flames in a furnace. When ever air restrictions block the vent the heat builds rapidly. You must correct the problem and then reset the switch. Look for rusty burners, cobwebs, bird nest, wasps nests, etc.



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