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retired17
Premium
join:2007-01-24
Anaheim, CA

1 recommendation

reply to dm19891

Re: Furnace starts, then shuts off.

I had a furnace that had exactly the same symptoms. It turned out to be a defective air flow senser. That is the furnace checks that the blower is actually blowing by sensing air flow with a tempetature gauge. As long as the temperature measured relatively low, the blower was blowing. If not, it turned off the furnace. Checked that, too.



KrK
Heavy Artillery For The Little Guy
Premium
join:2000-01-17
Tulsa, OK

Yeah, the overheat safety cutout. The guy checked that too on the maintenance check. He disconnected the blower motor while the furnace was running, simulating a failure. After a short period, the furnace shut itself down.
--
"Fascism should more properly be called corporatism because it is the merger of state and corporate power." -- Benito Mussolini