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so you guys don't think this is related to the pressure switch or unitherm regulator? Thank you for your help so far. Just grasping at straws that i don't have to buy a $300 board and i can fix it with a $30 part...

Hello all - I am new to this forum and a guy who like to do all of his own repairs. I have 2 issues with my 9 year old Raypak (Rheem) 406A heater atmospheric. 1) the heater will kick on and run properly for about 10-15 minutes, then the flames go off and the heater screen goes back to "SPK"...