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munchkin boiler F09 error

glenn1953 Member Posts: 1
model 140m R2 .... The flame rectification probe part# is 7500P-039. When I ordered a new one I received part# 7250P-049 which is longer than the 039. I installed it anyway and monitored the voltage which did reach 4.0 volts and the boiler is working fine. Is there any reason why I should not use the longer probe?


  • clammy
    clammy Member Posts: 2,740
    I can’t see any reason why it would be a issue. Have u had your boiler serviced meaning burner pulled heat exchanger cleaned ,combustion testing . Also have u checked your spark Ignitor . Usually getting flame or ignition issues means it might be up for servicing peace nd good luck clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating