Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Munchkin F09 and F10

tim smith
tim smith Member Posts: 2,774
If so and it was on, do you see any signs of water leakage from system. If not, where did the water go. Turn power off to boiler, isolate from system and pressurize cold to about 20, leave sitting there for several hours, if pressure drops you probably have a heat x leaker. See if you see water coming out condensate drain while off like this. If not, if you are a tech, pull off front of heat x and cleaned heat x, check targe wall for deterioration. Clean flame rod, electrode and burner tube and its mounting plate for good grounding. Maybe this will stop the F09 but still want to know where water going?? Good luck, make sure to reseal front well after cleaning and analyze combustion when done. Cleaning must be done once a year on this boiler. Tim


  • Rob Blair
    Rob Blair Member Posts: 227
    Munchkin F09 and F10

    Went to check on a Munchkin 80 on propane. Had F09, pressure was low, increased the pressure, fired it up and it ran fine. Did a combustion test, it was running rich, set it to specs and left.

    Ran one day, and now it is an F10 fault code. Going back tomorrow. Any things that I should check right off the bat?


  • Search...

    F09 and F10. Lots of info there. Good luck
  • I think,,,

    he meant gas pressure. :)
  • tim smith
    tim smith Member Posts: 2,774
    No I meant water pressure,

    This is because he originally found the pressure low in system and I suspect he may have a heat x leaking, possibly.
  • Yes but,,,

    when he said "pressure was low" I thought he meant gas pressure, maybe he did mean water now that I reread it. Here's hoping it's not a leaky HX. ;)
  • Derheatmeister
    Derheatmeister Member Posts: 1,572

    What was the Pressure at?
    Did you use you own gauge to check the Pressure?

    Could be a leak or Maybe even the Pressure Switch is defective or crud is in the Pressure switch?
This discussion has been closed.