I just started a KHN055 on Friday. Apparently I accidentally left the gas off after removing my manometer during startup testing. The homeowner(also the owner of the company I work for) discovered this and reset the boiler, but then the boiler locked out again after, apprently, failing to ignite 3 times. I am going there tomorrow to investigate, but I want to know more about this particular fault before I go. The service manual says to check:
Louver Proving Switch (don’t have, jumper in place)
Blocked Drain Switch ( was draining okay, needs investigation )
Air Pressure Switch (needs investigation)
Gas Pressure Switch (don’t have one)
Is this list comprehensive, or are there any other issues that will cause this fault. Everything was working perfectly when I completed my startup on Friday afternoon.
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