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Furnace cycles properly for awhile then at some point when it fires up for the next heat call the inducer fan kicks in then the gas comes on for a few seconds then shuts off, I have tested all the flame and rollout switches and they all appear to be good. I next replaced the ignition module or ( brain ) and vacuum switch with O.E.M parts then the T`stat, problem still exists. What now ?????? the owner of the furnace replaced the flame sensor last year, i tested it as well and it appears o.k The unit is a trane MO# TUE080A936l3 SE# 4332J7Y1G. I would appreciate anything you can tell me to help them out, they are struggling and connot afford to hire a company. I am a freind and an RSES certified tech but am still at wits end thxs.

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Ck the exhaust and make sure its clear . i'M sure your are of birds and spiders . there web 's ect // the shut down of burner if poor exhaust is normal . and the inducer fan to clear ou gases is normal . but short cycling is often a hi limit problem . or poor air flow . i/M sure you have ck'ed the return air and filters . . and you might ck the blower to make sure the air movement over the heat exchange is proper . . this is just a ck & see list and hope it helps . it may even be a weak hi linit . .. mm

Posted on Nov 15, 2010

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