Mitsubishi Electric · MSZ-AP Air Conditioners
In a multi-system setup, an indoor unit that is not currently operating may feel slightly warm, and you might hear a sound similar to water flowing from it.
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This is a normal phenomenon in multi-system installations and does not indicate a malfunction; no action is required.
The slight warmth and sound are a natural result of the shared refrigerant lines.
Continue using the operating units as normal without concern for the non-operating unit.