Mitsubishi Heavy Industries · Air Conditioners
Error E30, indicated by a single flash of the outdoor unit's red LED, means there is a connection error between the indoor and outdoor units. This prevents proper system operation.
Click steps to track your progress.
Turn off the main power supply to the air conditioning system.
Check all interconnecting wiring between the indoor and outdoor units for secure connections.
Look for any signs of damage or breaks in the wiring insulation.
Verify that the wiring connections are correct according to the installation diagram.
Restore power and observe if the error clears; if not, contact a professional technician.