f09 error code for munchkin boiler

Dale_Ingraham

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?

BPH

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

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.