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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8277
Experience:  Furnace, A/C and heat pump specialist.
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I have a lennox G23Q3/4-100-4 furnace. Induction motor runs,

Customer Question

I have a lennox G23Q3/4-100-4 furnace. Induction motor runs, ignitor sparks, ignitor flame comes on very briefly then goes out, burners do not come on.
JA: Did you check the furnace's filters?
Customer: I took it out
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: I have wiped off the flame sensor... It didn't look dirty.
Submitted: 9 months ago.
Category: HVAC
Expert:  airheatman replied 9 months ago.

Id burners are not completely lighting it sounds like you have either a gas pressure issue or a bad gas valve. Do you have access to a manometer or gas pressure gauge? If not we will need to obtain one or call in a technician to check pressure on both sides of valve to determine if issue is inlet pressure or a bad valve.