Trane XE90 LED Troubleshooting Codes

furmanator · 12-16-2008, 09:30 PM

Have a Trane XE90 and it's blowing air but the Igniter will not go on. The boards LED is flashing 4 times. I moved in 2 years ago and replaced the igniter about 2 months ago. The prevous owner did not leave me with the manual with the codes. If anyone out there knows what the codes mean It sure would be apprieciated, it's going to be a two dog night. Only problem is I have a Jack Russell who provides too little heat and a Bullmastiff that pushes me out of bed.

kok328 · 12-17-2008, 07:12 AM

Check on the back of the removable panels or ignition control module to see if there is a diagnostics chart.

furmanator · 12-17-2008, 07:23 AM

I did and there was nothing there

FmrLCpl · 10-17-2009, 03:22 PM

Quote:

Originally Posted by furmanator

I did and there was nothing there

4 flashes -- Open High Limit Device

whatever that means.

kok328 · 10-19-2009, 04:59 PM

High limit switch is a device to shut down the system in the event of an over-heating condition in the combustion chamber. There are dozens of types of switches being used. Some are manually resetable and some are not. The resetable types will have a small red button in the center of them between the two wires. Press this button in and try the system again. If it is not the resetable type then you might get lucky by tapping on it to get it to unstick. Otherwise you'll have to replace it. Just be sure to replace it with one of the identical ratin. The spec print on these is microscopic and will require a pair of young eyes or a magnifying glass to see.