$675 later, there is heat. The invoice says: “1/27 Find PC control board bad. 1/29 Get & replace PC board – retrofit wire in – find heater combustion motor bad – get & replace motor & wheel – check heater & blower operation.” As I understood it, after he got the logic board in he discovered the combustion motor (one of three motors in this benighted contraption) was rusted/seized/locked up SOME way or another and couldn’t be freed, so he liberated another motor from the company’s junkyard of “saved against a rainy day” spare parts, and installed that. House temperature came back up to normal within two hours of turning the furnace on, and I can again sit here unclothed more-or-less comfortably (except my for feet, which are cold; the draft in this room is fierce).
He said now that it’s fixed we should be able to get a couple more years’ service out of it before it has to be replaced; he couldn’t read the maker’s plate very well but thought it was made in 1993, which would put end-of-service-life around 2008 or 2009.
Figure 5 is a schematic flow diagram. Fnord.
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