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Old 10-16-2010, 08:27 PM   #1
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lennox pulse g21q3 60 3


need help goes through all the system checks ,gas valve opens and i hear the sparking but no ignition. Any ideas. How do i even see the spark plug. Nightmare furnace

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Old 10-16-2010, 08:30 PM   #2
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lennox pulse g21q3 60 3


You cannot see the spark plug. That is a VERY specialized furnace which only experienced Lennox techs and a few others can service. I have done lots of them but cannot walk you thru it. Heat exchanger should be pressure tested by a Lennox Pulse trained tech.

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Old 10-16-2010, 08:59 PM   #3
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lennox pulse g21q3 60 3


If it was a pressure problem the surely it would not try to ignite? I appreciate they are very specialised and maybe this is an ignorant question.
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Old 10-16-2010, 09:09 PM   #4
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lennox pulse g21q3 60 3


There are 12-24 different reasons it won't ignite and I cannot walk you thru them.You need experience with them and a manometer etc to deal with: dirty or damaged air flapper or gas flapper, low gas pressure, intermittent gas valve, weak spark generator, bad spark plug or wiring, partially plugged gas feeder port, cracked heat exchanger, collapsed muffler to name a few.
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Old 10-16-2010, 09:16 PM   #5
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Oh dear! thanks for your help.
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Old 10-16-2010, 09:21 PM   #6
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lennox pulse g21q3 60 3


I won't touch those things.

Got no training on them.

Now a little 2.5 million BTU modulating furnace, or a little 6,000,000 BTU modulating steam boiler. No problem.
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Old 10-17-2010, 08:39 AM   #7
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lennox pulse g21q3 60 3


Think I might just replace it. Maybe cheaper in the long run
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Old 10-17-2010, 09:12 AM   #8
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lennox pulse g21q3 60 3


Yep. It is the 30th yr for the Pulse and unfortunately some of the parts manufacturers are out of business and some parts are going obsolete. Great, tough ole buzzard of a furnace though. The Lennox G61V and SLP are great substitutes.

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Last edited by yuri; 10-17-2010 at 09:19 AM.
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