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SandShark
Long may you run
Premium,MVM
join:2000-05-23
Santa Fe, TX
kudos:3
reply to dm19891

Re: Furnace starts, then shuts off.

A poor flame sensor current will show by the yellow flame sense LED light on the circuit board located in the blower compartment. If flame sense current is good, the light will be steady. If flame sense current is poor, the light will flash. You will have to check this with the blower door off (since there is no site glass) and by manually engaging the door safety switch. Just be careful when doing this and be sure nothing can get sucked into the blower when it starts. If the flame sense LED shows the current is poor, turn off the power to the furnace, remove the flame sensor, clean with steel wool (not emory cloth/sandpaper), install and check.