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Old 10-29-2010, 07:08 PM   #1
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Request help with HEIL not lighting


Hey everyone,

Model #NUGK075DG07 - 867.769426

My furnace has been acting up the last couple of days. We left for two weeks and I shut the heat off. Ever since it hasn't been working properly.

Symptoms:

the exhaust blower always turns on when the Thermostat calls for heat, followed by the sound of the igniter. The pilot usually lights about 50% of the time, and the main burner usually doesn't light off.

I have been able to get the main burner to light off by rotating the fan limit switch clockwise with my fingers. This usually works, but not always. Because of this, I have been turning the furnace off in between use, and doing the above procedure when I want heat. This morning, the above procedure didn't work, so.... you guessed it, no heat.

Any suggestions would be appreciated.

Thanks,

Clark


Last edited by scjfly; 10-29-2010 at 07:10 PM. Reason: spelling
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Old 10-29-2010, 07:56 PM   #2
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Request help with HEIL not lighting


You may want to clean the pilot orfice and the flame sensor

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Old 10-29-2010, 08:18 PM   #3
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Request help with HEIL not lighting


Where would the flame sensor be on this model? In the general area of the pilot, all I can see is a ground wire, gas line to pilot valve, and the ignitor. Am I missing something?

I am pretty sure that the gas valve isn't sending gas to the main burners.
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Old 10-29-2010, 08:20 PM   #4
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Request help with HEIL not lighting


Just so I'm thinking straight.

Off the pilot assy how many wires are there and what color. Do they connect to the gas valve?
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Old 10-29-2010, 08:22 PM   #5
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Request help with HEIL not lighting


Two wires,

One large red wire that goes to the ignitor.

One small white wire that grounds to the pilot assembly.

Thanks for the input.
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Old 10-29-2010, 08:31 PM   #6
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Request help with HEIL not lighting


Does the red wire look like a spark plug wire
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Old 10-29-2010, 08:40 PM   #7
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Yes, thats the one.

When I was reading up on how these furnaces work, it mentioned a flame sensor. Could this furnace not have one?
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Old 10-29-2010, 08:45 PM   #8
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Request help with HEIL not lighting


The red wire is just like a spark plug wire and where it connects it can lose it contact. Simply remove the wire from the control board and check the connection. Sometimes in a pinch I will cut off an 1/8 or 3/16 of an inch and reconnect it. This may be why the pilot sometimes does not lite.
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Old 10-29-2010, 08:48 PM   #9
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Thanks,

I'll try that.

Could there be a reason that the main burners won't get gas even with the pilot working?
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Old 10-29-2010, 08:54 PM   #10
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I just can't remember where the flame sensor is on this furnace. I have seen that after the pilot lite it may take 15-20 seconds for the main burner to lite.
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Old 10-29-2010, 10:16 PM   #11
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If I remember correctly ( need a pic to be sure) that unit senses flame back through same wire

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