Trane Furnace Error Code Green OFF / Red Continuous

This fault code indicates an internal fault has been detected within the Texas Instruments ignition control module. The module's self-diagnostic circuitry has identified a problem it cannot recover from on its own. The green LED being off combined with a continuously illuminated red LED is specific to this internal module fault. It can occur at any point during furnace operation.

A furnace displaying this fault code has a compromised ignition control module, which manages critical functions including gas valve timing and igniter sequencing. Operating the furnace in this state is not recommended, as the module may not reliably control the ignition process. The furnace should be taken out of service until the control module is replaced.

The cost to replace a Trane ignition control module typically ranges depending on the specific module required and local labor rates. Parts alone can range from roughly $100 to $400 or more, and professional labor adds additional cost. Getting a quote from a qualified HVAC technician before proceeding is advisable.

Because the fault is internal to the ignition control module, there are no external adjustments, sensor checks, or wiring repairs that will resolve it. Replacing the ignition control module is the prescribed corrective action. A knowledgeable DIYer comfortable with furnace electrical components may be able to perform the replacement, but working with gas appliance control systems carries safety risks and many technicians recommend professional service.

Resetting the furnace by cycling power is unlikely to permanently clear this fault. Because the fault is generated by the internal self-diagnostic circuitry of the control module itself, the underlying hardware condition will remain even after a reset. The fault code will typically return once the module resumes operation. Replacement of the module is required to resolve it.