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I was servicing a 2003 199,000 BTUH Munchkin today.
Was getting F09 codes, cleaned HXC, spark and FS.
Several good starts and light offs. FS showed 4.1 microamp at 4600 RPM. No F09 codes.
Changed high limit from 160 to 155.....then:
Would not restart, showed first F-13 and then E-13.....low fan speed.
Fan would not run at all. Reset did nothing...Power off and back on did not change anything.
Unplugged control cable and with 120 at power cable to fan, fan would not go to high speed.
(I think this should happen??).
Returned HL back to 160 and still E-13.
Did the fan just decide to die while I was there?
This boiler has done well since install, only needing cleaning every 2 years and perhaps a FS and spark electrode.
No major parts other than that.