My Trane TDE100A9455M2 is flaking out on me. Symptom is that the
igniter goes out just a moment before the gas valve opens and fails to
ignite. Typically, it ends up cycling until the IFC locks it out and
decides to blow cold air around the house.
The company that installed the unit for the previous owner of the home
came out and told me the IFC was broken and quoted something like $500
to replace it. "Shenanigans," said I and tried to track down what the
IFC really costs. It's a White Rogers 50A55-476, which according to
google doesn't exist and it doesn't show up in the white rogers online
catalog and trane doesn't seem to have an online parts list either.
So, I finally gave up and got a 50A55-843 off ebay NIB for cheap. When
it's installed it powers up, then turns on the blower and reports that
the flame sensor has detected flame when non called for. Presumably,
while otherwise compatible, the flame sensor installed doesn't work with
Should I track down an alternate flame sensor that should work the
50A55-843 or try to track down a 50A55-476? Or am I going in the wrong