Error code reference

Trane Furnace Error Code Solid Red

Internal gas valve circuit error (damaged furnace control)-control senses 24V at gas valve when it should not be, or control tried to turn on gas valve but 24V not sensed.

SourceTrane UHM/DHM Series Furnaces - Service Manual: Specificationsp. 34, 38

Diagnostic procedure

The full Solid Red procedure

Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.

MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Replace IFC board.

SourceTrane UHM/DHM Series Furnaces - Service Manual: Specificationsp. 34, 38

More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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