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Tell me exactly what t is currently doing and if does same thing in both heat and cool modes or just heat
OK when the blower comes on is there any change in characteristic of flame and does flame roll out of chamber to trip switch?
OK so flame is not rolling out, but the rollout is tripping? Or is the high temperature limit tripping?
Yes I am familiar with the unit.I am a Goodman Dealer. Is it the one above burners that has to be manually reset or one in vestibule that resets when t cools down?
If the manual reset one is tripping it is not going to be to do with blower.Either the flame is getting to close to the rollout or rollout is wrong one or weak tripping prematurely even if new.
I totally understand. I am just not sure why techs would replace that expensive ecm motor over an issue with a rollout switch.The sole purpose of that limit is if the flame rolls out of chamber it shuts down burners for safety.
The main limit on the other hand would trip if the blower is not moving sufficient air across the heat exchanger and allowing chamber to overheat.
My first suggestion if you are able to do so, or have one do so is look at the rollout switch they installed and see if it is the correct one.
The correct one is part number B1370154 ROLL OUT SWITCH, rated at 350º
Sounds good, Sorry you are having so much trouble with this thing.