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Rick Mather
Rick Mather, HVAC Technician
Category: HVAC
Satisfied Customers: 3634
Experience:  35 years experience, HVAC
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hi our lennox direct vent forced air natural gas furnace model

Customer Question

hi our lennox direct vent forced air natural gas furnace model g14q3-60-20 will light, run 30sec, then shut off. we have had similar problem years ago and the condensation track was backing up. now i have tried emptied and vacuumed to suck all moisture it appears to sound clear. i have also vaccumed the intake and that seems clear. any suggestions? thanks
actually we got it to work--it was the brown wire on the limit switch that was burnt out--any idea why this could have happened? if you answer in the next hour (till 2:40pm), i will be gladly paying you. thanks
Submitted: 6 years ago.
Category: HVAC
Expert:  Rick Mather replied 6 years ago.
The only way it might have had some type of back draft and the flue heat cooked the wire was the limit tripped at all

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