Question about Comfortmaker N8MSN0902120A 88,000 BTU 80% Gas Furnace, 1 Stage,

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Lost power after storm -unit will not reset - don't get the heart beat "led" --will not turn on -cool , heat or just the fan

Tried setting thermostat to all off modes and then turning off all power going to furnance using the fuze box -after 5 min wait repowered unit - led light stays on but faint ,no blinking . tried this twise same out come what sould i try next ?? - thx for the help

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There should be an automotive 3 amp fuse on the circuit board. It should be good, IF you are getting a heartbeat, but check it anyway. Considering it was a storm, I'd look at the grounds. Make sure it is making a good and solid connection to the ground lug. Grounds make freaky problems sometimes.

You mentioned 'fuse box' and not a breaker box. The furnaces of today with their circuit boards require a good ground all the way back to the ground lug in the box. Sometimes they will work fine without, then decide they are not gonna work at all. Sometimes, even a dry ground rod outside the house is the culprit.

Posted on Nov 22, 2014

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Posted on Jan 02, 2017

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