Mitsubishi Electric · Air Conditioning
The CN10A connector on the indoor electronic control P.C. board or its associated lead wires are disconnected. This disrupts power or signal to the board.
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Turn off the power supply.
Reconnect the CN10A connector securely to the indoor electronic control P.C. board.
Inspect the lead wires for any damage and repair or replace as needed.
Ensure the connection is stable and properly seated.