A100_O
Communications Lost with Indoor Unit
This code typically points to
- Control/communication malfunction between indoor and outdoor units
Next checks to confirm
- Verify communicating bus and indoor-outdoor comm path
- Check daisy-chain topology and shield grounding
- Accessible snippet does not print full tree
Escalation
Lockout while active, short cycle to restart
Reset behavior
Clears when communication is restored.
Urgent
Fix now