Hope this helps
Hi guys I'm a service technician and your problems sounds very familiar unfortunately without checking the equipment I might not be of much help, but I guess anything helps right..... if the flame comes on and it shuts off after a short time like 10 or 20 seconds check the vent cap, it might be broken, check for an obstruction in the vent, if the cap is broken replace it, one good way of checking if its the vent is taking the cap off at the furnace and run the furnace but not for long you want to be smelling those fumes, this is to check if the flame stays on for longer than 20 seconds like somebody posted, one thing you never, ever want to do and I'm serious about this I've seen accidents happen because of this is to jump out safety switches specially the high limit switch dont ever jump those safetys, they save lives, hope this helps any questions i'll try to help if not I'll find out for you guys, we're a Bryant Diamond dealer so most of the equipment we sell, install, and service is Bryant.
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