Mitsubishi Electric · Air Conditioning
This code indicates an A-Control fault, corresponding to E7 or E9 errors, which typically involve communication problems between indoor and outdoor units.
Click steps to track your progress.
Refer to the E7 and E9 fault code explanations.
Check for condensate pumps interfering with communication lines.
Ensure the correct power-up sequence (indoor then outdoor unit).
Inspect communication wiring.