Mitsubishi Electric · MSZ-FH Air Conditioners
In an MXZ type multi-system, the outdoor unit operates but the indoor unit does not. This occurs when indoor units are set to different operation modes (e.g., COOL/DRY/FAN vs. HEAT). The unit that started first has priority.
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Unify the operation mode across all indoor units (e.g., all set to COOL or all set to HEAT).
Check the remote controller settings for each indoor unit.
Turn off power to all indoor units, then turn them back on and set to a unified mode.
If the problem persists, reset the system by briefly disconnecting power to the outdoor unit.
Refer to the outdoor unit service manual for MXZ type specific multi-system operation details.