I have a Trane XR80 furnace that has an LED flashing 4 times--Open High Limit Device. The filters are new and clean, I replaced the high limit switch, cleaned the flame sensor. Are there other switches I could check? Any other ideas? Thanks for any help or ideas. Brian

I was told by a Trane technician that either my high limit switch or the fan relay was causing my problems. The relay is on the control board, but where is the high limit switch

My furnace kicks the burner off when the fan starts. After 30 seconds the burner comes back on and then it runs through its cycle pretty much like it's supposed to. I was told by a Trane technician that it could either be the control panel orthe high limit switch. Where is the high limit switch...

I have a Trane XB80 furnace that has two high limit devices. About 2 months ago, I had both switches replaced because the furnace would not go into a fault condition with the technician there (of course). He said that these high limit devices are automatically resetting which makes it nigh...

Furnace is about 13 years old... we just replaced the ignighter in it last night because it was running through all the steps to run except ignighting. It fired right up and ran for about 7-8 hours... now it won't ignite at all (it is running through all the steps it needs to except for...