Originally Posted by rigguy
I have a trane XE 90 that is mounted in the attic. The unit will run when the heat is selected at the thermostat but the unit does not light and just blows cold air.
Well first you have to get in front of the unit have it call for heat so you can see
whats going on. See if you have a lite blinking that gives you a code that you can look up in your book. This is what happens when is calls for heat.
First inducer starts.
prep urge for 30 seconds.
then glow bar start to heat up for 15 to 30 seconds.
then main gas open and burner fires up.
If you don't get fire up , the blower will still come on.
There are a lot of things that can stop a unit from firing.
Do you have a way of testing 24 and 110 volt power? Paul