08:56AM | 12/29/02
Member Since: 12/28/02
3 lifetime posts
I have a series G20 WhisperHeat Lennox furnace and a Honeywell CT3500 with 5/2 day programmable Thermostat. The last few weeks the furnace has not been resuming in the morning. The thermostat shows "Night in
Recovery" and the flame is on the display, meaning it should be lighting soon or already lit. The thing is it never does, and I have
to turn off the furnace switch on the wall to reset the furnace. When
I do the damper motor closes and then I switch the power on then the
green light to the ignition control comes on and then after a few
seconds snaps 3-5 times then ignites. After that it cycles as usual.
The temperature is 5+ degrees lower than the night setting when this
happens meaning no heat has been generated.

This morning I awoke early to watch it go from night to morning
setting which would be the "Night in recovery" mode. The green light
came on the ignition control went on, then the igniters snapped 4-5
times, then whoosh the furnace ignited. Then after 5 seconds it shut
off, gas and flames but damper is still in open position. I then have
to turn the Power to the furnace off then off. Again the damper closes
and it ignites.

Could the Roll out switch need replacing? Is this a simple cleaning of
the various switches or a call to my friendly service man?

Thanks in advance.

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05:17AM | 12/30/02
Member Since: 12/28/02
3 lifetime posts
The Flame sensor had the white coating on it and I took some emery cloth and did a light sanding on it.

Took the burner unit apart and also cleaned.

When it starts now it starts right off the bat! It used to take a few times!

Thanks again for your input!



06:04AM | 01/08/03
Member Since: 12/28/02
3 lifetime posts
Update. Worked for 4 days then got worse would spark and pilot would light then burners would light for 5 seconds then go out.
Called out the repairman $175 l8r he changed the Flame sensor. 8 hours l8r it started again. called him back @11:30 p.m.and he replaced the "Johnson" Ignition Control Board with a Honeywll replacement. seems the Johnsons are defective from what I have read. It has worked since that day.

I wonder why the dealers do not know this or Lennox has not had anything up on there site.
I think thye should have to flip the bill for the labour!


11:22AM | 01/21/14
I havae a Lennox model G1603/4-100-1. The pilot will not light. The ignitor clicks several times but does not light. Can you help? Could it be the thermostat, ignition module, pilot flame sensor assembly, flame sensing rod/flame sensor? The unit is 26 years old.


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