Trane Reliatel Rooftop Units
Re: Heat Fault Code 1
Reliatel gas/electric rooftop units have a Heat Control Board as well as the Reliatel Control Board.
There are several version of the Heat Control Board, but two main varieties: 1) Spark ignition and 2) Hot Surface ignition.
The Heat Control Board has an LED for displaying status & fault information. It is very common for the heat faults to not be shown anywhere on the Trane diagrams.
Code 1 = Communication Fault
The Heat Control Board uses Modbus communications to communicate with the Reliatel Control Board. A Code 1 indicates a loss of communications between the two.
| Qty | Likely Causes of Code 1 (from most to least likely): |
| 1 | Bad Reliatel (RTRM) Board |
| Bad Heat Control Board | |
| Bad wiring between RTRM & Heat Control Board |