Trane Error Code

[Dominic379]

Hi all. I have a Trane XL19i installed in my home. The other night, the AC stopped working and the thermostat was blinking red (its a ComfortLink thermostat). It was displaying two error codes, #89 and #90. Does anyone know what these codes mean? The system went back on by itself a few hours later, so its working right now. I have a call into my hvac company asking about this. Thanks.

[mark beiser]

Communications error with one of the parts of the system.

[snacktray]

I had an err 91 code a while back. it turned out the installers had one too many wire nuts on the 24v dc lines causing one to back off. took the techs 2hrs to trace it down...