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    Raypak (Rheem) Heater Issues

    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"...