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Old 12-06-2009, 08:37 PM   #1
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furnace question


is it normal for my lennox G26 in the morning when trying to raise the temp in the house from 17-21 to start and stop the flame several times. the blower runs steady during this period but the flame seems to kick in and out Is this some sort of over heat sensor maybe

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Old 12-06-2009, 08:46 PM   #2
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No that is not normal. Clean the flame sensor to start with. It has a white cloth like covered wire and is located in the upper left corner. Check the diagnostic lights and compare the blinking code to the label on the lower door.

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Old 12-06-2009, 09:00 PM   #3
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What is the full model #. If it ends in a 1 or 2 it could be an old blue johnson control module that needs to be upgraded. Or it could be water accumulating in the drain t which would need to be unplugged.
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Old 12-06-2009, 09:05 PM   #4
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Or a dirty air filter.
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Old 12-06-2009, 09:07 PM   #5
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Check the blinking LEDs and read the code. Not uncommon for units to cycle on/off and ride the limit control if they run more than 10 minutes steady.
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Old 12-06-2009, 09:31 PM   #6
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it is a johnson control G77-6RD-2 any idea what the new number would be? there are no led lights flashing
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Old 12-06-2009, 09:34 PM   #7
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How clean is your air filter.
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Old 12-06-2009, 09:35 PM   #8
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it is new
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Old 12-06-2009, 09:49 PM   #9
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Ok, so you just put it in today.
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Old 12-06-2009, 10:01 PM   #10
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You would have to put a volt meter on the limit control and see if it gets 24 volts across it when the flame goes out. That means it has opened and may be caused by poor airflow due to dirty A/C coil, vents and dampers closed, undersized ductwork.
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Old 12-07-2009, 05:00 PM   #11
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when this on/off cycle is happening the thermostat is still calling for heat and the blower is running however the combustion fan and flame are not on. before the blower stops those kick back in and all is well. it was suggessted to me that this is normal because of over heat and the furnace just has to cool down a bit

any suggestions about this?

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