Mitsubishi Heavy Industries · R410A Systems
This indicates a system communication error between components, similar to an E0 error. It means signals are not being sent or received correctly, impairing system control.
Click steps to track your progress.
Turn off the air conditioning unit at the circuit breaker for 30 seconds.
Restore power and restart the unit.
Check for any obvious physical damage to wiring if safely accessible.
If the error persists, a qualified service technician should inspect the control boards and wiring.