15
Blower motor lockout
This code typically points to
- Blower failed to reach 250 RPM
- Blower failed to communicate within 30 seconds in two successive heating cycles
- ECM motor/module issue
- Wiring issue
Next checks to confirm
- Verify blower motor powers and communicates
- Inspect harness/connections
- Isolate ECM motor/module vs control with OEM blower/ECM procedures
Escalation
Repeated lockout after proven-good blower wiring/power strongly points to ECM module/motor or control failure.
Reset behavior
Auto-resets after 3 hours.
Urgent
Fix now