10 year old Munchkin 140 boiler. Maintained/cleaned yearly. Recently have been getting F18 error "gas valve failure" Replaced gas valve low voltage wiring harness also replaced the gas valve with a new Dungs valve. Harness is tight to gas valve as are all connections. Worked fine for 8 days. Back to F18 error early this morning. Before new parts were installed was having daily F18 errors usually in the early morning (12-5am). What's next, a new control board? Have the 925 controller. Gas company checked the meter and regulator which are fine.
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