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lutful
... of ideas
Premium
join:2005-06-16
Ottawa, ON
kudos:1
reply to robbin

Re: noisy furnace fan

The house was built in 1989. YORK's model number label may be hidden behind the original installer's support label - I will check.

However, I know there is no draft inducer fan because I stood and watched the call for heat cycle. The faint pilot flame magically becomes a huge hissing flame. There is no fan noise at all just flames. The blower does not actually turn on until a minute later.

I checked the schematic again and it seems the heat call always runs the blower on HIGH. Only the manual fan call runs on the MED setting.