bryant plus 90 wont stay running


Old 12-30-08, 09:30 PM
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bryant plus 90 wont stay running

i have a bryant plus 90 that lights initially and then the flame goes out after a couple of seconds, i tried locating the flame sensor, but didnt see anything inside the burner box that resembled it, i removed both the inlet pipe, and exhaust pipe to see if either was blocked and it did light , but stayed lit for only about 1 min. before going out. it tries to light and continues to go out
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Old 12-30-08, 10:13 PM
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Does you furnace have a hot surface ignitor that glow eletrically to light the main burner or a pilot light?

If it has a pilot light it could be dirty and need to be cleaned. The pilot burner has to keep a bimetal strip hot to keep the main burner on, and when it gets dirty it can turn on and off errratically.

That's the most common thing that would cause the main burner to shut off and turn on again rapidly.

If you have a HSI or some other problem, the furnace would typically go through most of the ignition process again, rather than just turning on the main burner.
Old 12-31-08, 09:45 AM
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Being a 90+ your furnace almost certainly has a hot surface ignitor and a flame sensor. The flame sensor should look something like this:
It could have a bend or loop in it. It will be on the end of the burner assembly opposite the ignitor.

Does your furnace have a circuit board or control box with a LED light on it? If so how many flashes (and what color)?

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