Trane Furnace Error Code 10 Flash
Communication fault
Communication fault - blower motor no COMM response (BLW COMM ERR), inducer motor no COMM response (IND COMM ERR), system COMM error (SYS COMM ERR), blower COMM CRC error, inducer COMM CRC error, 24V COMM mismatch, or control failure.
First step from the service manual
Scroll User Interface to view Last 4 Faults; for SYS COMM ERR check if CONT900 is installed and verify ~12vDC from terminals D-B at IFC; for BLW COMM ERR check serial motor wires and 120 VAC at motor connector.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
Get the full diagnostic procedure for 10 Flash.
- Step-by-step tests with expected resistance, voltage, and continuity values
- Wiring diagram references and connector pinouts from the OEM service manual
- Verified part numbers when replacement is required
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