Error Code 79 from TRANE XL-90i on TCONT900AC43UA thermostat. Why and how to fix it [Archive] - Ask Me Help Desk

View Full Version : Error Code 79 from TRANE XL-90i on TCONT900AC43UA thermostat. Why and how to fix it

GiovanniI

Oct 3, 2010, 05:38 AM

The error code 79 appear when the heat should be coming on