I have a lennox diplomat furnace which goes through its ignition process and stays lit for about 20 seconds then goes out. the fan continues to run and the burners re-ignite after a couple of minutes for another 20 seconds . blowing cold air . any ideas ? i have cleaned the flame sensor.
jsboyd
might have a latching diagnostic reset the service switch on the side of the furnace lets hear back ...do you have an Induced draft fan mounted above the burner with PVC piping in and out runs
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