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Main burners wont stay lit on my Natural Gas furnace?

Corsair by Rheem furnace.

What Happens:

Call for heat

Evacuation fan comes on (not sure of the tech term for the evac fan)

Ignitor gets hot (had it replaced a year ago before I knew more about furnaces)

Single burner lights over ignitor

All burners light, ignitor turns off

Main blower fan comes on

All burners go out, both evac fan and main blower continue to run

Ignitor comes back on

Single burner, then all burners re-light like normal

Heat resumes being produced

***

Sometimes this happens only once until the t-stat is satisfied, other times it happens two or three times.

Ideas:

Replace flame on probe?

1 Answer

Relevance
  • chris
    Lv 7
    6 years ago
    Favorite Answer

    If your flame sensor is the kind with one wire, it makes an electrical connection to the burner manifold through the gas flame on the last burner. Over time it gets oxidized. This sensor can usually be cleaned up with a bit of steel wool and is as good as new.

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