I have a friend having trouble with a trane rooftop and he asked me
to post here for some opinions. He ( actually his technician ) is
working on a Trane YFC120A2ELA150, serial # 320102255L. The original
call was for no heat. The tech arrived and found the inducer motor
running weird and the heat exchanger and inducer motor extremely
sooted up. Checking voltage to the motor it would vary every second or
so from 240 down to as low as 90. The motor gets it power from the
board so the tech replaced the board AND the motor as well since it
was severely sooted. He cleaned the heat exchanger of all the soot and
restarted the unit, only to have the same results. Wiring the inducer
straight to the terminal block the motor runs just fine. Also, pulling
a wire off a limit switch or the gas valve the motor runs fine. He has
checked incoming power thinking perhaps the board was wired to a "wild
leg" but it isn't. No wild leg to that building. Talking with Trane
tech support hasn't helped as they say they've never heard of this
problem. Ground has been checked and rechecked. Any other idea's ?
It sounds like your "friend" needs to find a tech that can diagnose
and repair his problem. It sounds like he already got an inducer motor
and board that he didnt need. Maybe if he keeps replacing parts he
will finally get it right.
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