Hi there, I have a Luxaire furnace with Rogers White model 50A50-241. Once in awhile the bottom panel of the furnace will pop forward and the safety switch will shut the furnace off. Normally I push it back on and it resets no problem. This time the pressure relief valve is stuck closed. I had a repair guy out the last time this happened (2 years ago) it took him about 30 secs to fix it, was not so nice and charged me a fortune. I have been told there should be a manual reset. Can't see one, I have shut all down and waited then turned it all back on a few times. Waiting over an hour for it to reset. Panel says it has an auto reset. Unfortunately do not have the manuel. Can't get anyone here due to Thanksgiving. Any suggestions?