Question about Goodman GDS80904BNA Open Flame Heater

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I have a downdraft Goodman furnace. On only some occasions the blower will start, then after a few seconds I will see the igniter light up, but then I do not get the rush of gas and lighting of the burners. It will try this a few times and then stop. Then the light on the board starts blinking once (system lockout). If I wake up in the morning and it's cold in the house I can usually turn off the switch on the furnace and then it works fine... usually. I bought this house 3 years ago and replaced the board in the furnace the first year (furnace wouldn't work at all and board was slightly burnt when pulled out). I've also had it cleaned several times. Could the board be going bad again? Should I insulate the metal exhaust pipe to keep it from getting so hot near the circuit board? Will that hurt anything?.

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It sounds like you got a tough one there.When you say the blower starts up and then the igniter comes on are you refering to induced draft motor or main blower. The proper sequence is for the thermostat to call for heat at which point the induced draft motor should come on and run for 30-45 seconds,then the igniter should heat up for a few seconds then gas valve should open and main burner should light. After limit switch reaches set point for fan on ,blower should come on till after heat has reached thermostat setting then burner should go out, and blower run until fan off setting is reached on limit switch. If your furnace is not following this sequence and then not always doing the same thing in the same order,I would recommend that you change out board again. I have had several problems similar to this with Goodman units and all but one time installing new board solved it. That time I did everything I knew to do and talked to factory service techs repeatedly and finally installed new furnace. As far as your question about insulation,. As long as it is fire proof I can't see where it would hurt anything. Sorry I'm not more help. Good luck and thanks.

Posted on Nov 12, 2010

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