Mitsubishi Heavy Industries · Air Conditioners
When both the indoor and outdoor unit's red LEDs flash twice, it signals a communication error between the outdoor and indoor units. This prevents the system from operating correctly.
Click steps to track your progress.
Turn off the main power to the entire air conditioning system for 1-2 minutes, then restart it.
Check the communication wiring between the indoor and outdoor units for any loose connections or damage.
Ensure that all communication wires are correctly installed and not reversed.
If the error persists after checking connections and power cycling, a technician should inspect the control boards.