How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask airheatman Your Own Question
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7970
Experience:  Furnace, A/C and heat pump specialist.
16514686
Type Your HVAC Question Here...
airheatman is online now
A new question is answered every 9 seconds

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: 2 months ago.
Category: HVAC
Expert:  airheatman replied 2 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.

Related HVAC Questions