Trane xl 80 System Lockout?

Old 12-27-12, 11:10 AM
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Trane xl 80 System Lockout?

I have a Trane XL 80 system. When I try to start up the system it shows normal heat call on the circuit board. I ignites about six times in bursts of 10 to 15 seconds. Then the ignition turns off and the blower starts with no heat. The Circuit board then flashes in two light bursts. The error code says that the system is locked out check polarity. Not sure where I should be checking.
I have an White Rodgers 50a50 473 Circuit board.
Old 12-30-12, 03:28 PM
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often times this can be caused by a bad ground. sometimes it will be just a bad board.

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