Originally Posted By: rpalac
This post was automatically imported from our archived forum.
I take it your trouble shooting this for your self to learn what the problem is. Not for a report but to solve the problem.
The sequence sounds normal with the flue inducer fan and the igniter time frame.
It sounds like the re might be a safety kicking the flame out after six seconds. Some units have a roll back or role out safety the detects heat outside the chamber. If the flue is blocked, negative air pressure, or a split heat exchanger, thios could happen. The burner flame doesn't stay in the path it was intended for an rolls out toward the front hitting this thermal safety and then cuts out the gas valve.
That's a guess but not sure.
I thought that logic would point to the gas valve, temp sensor, safety, or possibly a bad thermal couple.
The themal couple is the cheapest thing to replace.
I'm curious to know the answer. Please re-post or e-mail me when you figure it out.