MHI · R410A Systems
This code indicates that the indoor unit's drain overflow protection system has detected an issue, likely due to a blocked drain or a faulty sensor.
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Turn off the power to the air conditioner at the circuit breaker.
Inspect the indoor unit's drain pan for standing water and clear any blockages in the drain line.
Ensure the indoor unit is level.
If the problem persists after clearing any clogs, contact a qualified technician to check the drain pump and overflow sensor.