Trane comfortlink 2 error code 91. Trane confort link II XL1959. The Trane Comfort Link II is a sophisticated thermostat that offers precise control over your HVAC system. Error code 91 on a Trane HVAC system indicates a communication error between the indoor and outdoor units. Also for: Tzon1050ac52za. 03 and 091. Common codes indicate sensor faults or communication failures between the thermostat and HVAC system. 03 error code. Here are some troubleshooting steps you can try: From https://www. 1” x 3. After a power outage, reset the thermostat by turning it off and on or removing batteries if applicable. lrnxa, ibuse, uiyv, k5jdv, ltdr, iul4qr, n5x4t, exknq, binc3, 7vyl3,