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Heater trane xe 90 working iregular, set to 70 heats up to 64

The burner ignites and then it goes out when the fan comes on. i have already cleaned the flame sensor and replaced the thermostat.  I noticed the small blower motor is on all day and when the burners come on there is a red light that comes on on the ctrl. panel. do i still need to replace the flame sensor?  thank you for your help.

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Possible problemis due to a thermo-couple that has seen better times. If I understand your system correct I would check that.

Posted on Jan 13, 2009

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