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Old 10-03-2011, 02:05 PM   #1
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lennox whisper heat g20


I did a routing start up of the unit, the pilot frame is on and the vent door open and the fan starts up but it fails to ignite the burner and then after a few minutes it shuts down, could be a sensor or that the burners are clogged up?

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Old 10-03-2011, 02:59 PM   #2
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lennox whisper heat g20


Whisper heat models light the pilot light first then the pilot is proved by the sensor which reports back to the ignition control (grey or blue box on right hand side). A common problem is the spring on the left hand side of the damper that makes a little end switch to allow spark to the pilot. The spring arm breaks and the pilot doesn"t light. Since your pliot is on, probably a dirty sensor (but then you typically hear it trying to spark ignite for a long time) check power going to gas valve or not. Could be ignition module or gas valve at that point.

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Last edited by HVACDave; 10-03-2011 at 03:02 PM.
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Old 10-03-2011, 05:49 PM   #3
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lennox whisper heat g20


That's one I'm going to advise you have a local tech come out. Heat exchanger cracks are very likely on that model so you'll want to know for sure before sticking any money in it.
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Old 10-03-2011, 08:02 PM   #4
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lennox whisper heat g20


I agree with marty and those old gas valve/ignition control combos are no longer available i believe.
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