Mitsubishi Error Codes

Find troubleshooting guides for all Mitsubishi error codes.

11 error codes across 1 appliance types

Minisplit

Code	Meaning	Severity
BLINKING-LIGHT	Causes and Fixes medium	medium
E6	The indoor air handler and outdoor unit have lost the data communication signal that coordinates their operation. high	high
E9	The condensate drain pump has failed, is clogged, or the float switch that monitors the pump has detected a drainage failure. moderate	moderate
HUB	Hub page covering all Mitsubishi Electric mini-split error codes for MSZ and MXZ series heat pumps. low	low
LEAKING	Causes and Fixes medium	medium
NOT-COOLING	Outdoor Unit, Refrigerant, and Sensor Fixes medium	medium
NOT-HEATING	Causes and Fixes medium	medium
P4	The condensate drain pan under the indoor unit's evaporator coil has filled with water, indicating the drainage system is blocked or failing. high	high
P5	The drain float switch inside the indoor unit has been triggered due to water accumulation in the drain system, indicating drainage cannot keep pace with condensate production. high	high
P6	The current transformer (CT) sensor on the outdoor unit has detected an abnormal current condition - either the sensor itself has failed or the compressor is drawing abnormal current. high	high
P8	The indoor coil temperature has dropped below the safe operating threshold, triggering freeze protection. This is commonly caused by low refrigerant charge or severely restricted airflow. high	high