b1
Integrated control module has lost communications with circulator blower motor
This code typically points to
- Loose wiring connection at blower motor control leads
- Failed circulator blower motor
- Failed integrated control module
Next checks to confirm
- Tighten/correct wiring
- Check blower motor and replace if necessary
- Check integrated control module and replace if necessary
Escalation
Furnace fails to operate
Reset behavior
Clears after blower communication path is restored.
Urgent
Fix now