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Munchkin 80M throwing F9 and f10 codes
Beginning two weeks ago the boiler faulted with an F9, flame loss code. the flame rod was cleaned and restarted normally and operated for two more days, then F9 or F10 code. Boiler wouldn't relight and was left for another visit a week later. All related to me by another technician.
At the time of my first visit, restarted normally, and recovered ignition when the flame rod lead had been removed in order to measure uA. The microamperage reading initally was 0.7-0.8 (below spec) and then slowly climbed to 3.0 or so. During the same visit, the condensate drain was supported to eliminate a sag at the back of the unit and the air intake pipe was secured in place. Unit ran normally for an afternoon and failed in the evening with an F10 code.
I shall replace the flame sensor ASAP. Any knowledge if a Lochinvar model of similar design will work?
After this, what shall I look towards to the nature of this malfunction?
The first Munchkin Ive ever had my hands on.