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f09 error code for munchkin boiler

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Dale_Ingraham
Dale_Ingraham Member Posts: 1
in Gas Heating
I am installing a used munchkin boiler. I keep getting the f09 error code. I have good spark and gas to the furnace. How do I know if the gas valve is working correctly or is defective?

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  • BPH
    BPH Member Posts: 39
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    Have you opened up the hx to see its condition? How old is the unit those heat exchangers can get pretty plugged up.
  • Tim McElwain
    Tim McElwain Member Posts: 4,621
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    Do you have the manual? If so the requirements for an F09 are in it if not e-mail me at gastc@cox.net and I will e-mail you the code breakdown and solutions.

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