Mitsubishi Electric Mini-Split Code UE
Soft lockout
Abnormal pressure at the 63HS high pressure sensor. The sensor read 14.5 PSIG or less, which normally means the sensor or its connector has failed rather than that the system is actually empty.
Manual wording: “Abnormal pressure of 63HS - Abnormal if 63HS detects 14.5 PSIG [0.1 MPa] or less. 63HS: High pressure sensor”
Documented for: PUZ-HA and other A-Control outdoor units with a high pressure sensor
Likely causes, most common first
- Disconnection or contact failure of connector 63HS on the outdoor controller board
- Defective pressure sensor
- Defective outdoor controller circuit board
What you can safely check yourself
- Turn the system off at the breaker, wait one minute, and turn it back on once
When to call a technician
The pressure sensor is a refrigerant-circuit component inside the outdoor unit. Call a technician.
A Mitsubishi Electric mini-split throwing this code repeatedly has a reason — clearing the code without fixing the cause just hides it.
Source
- Service Manual No. OCH750 Revised Edition-E - PUZ-HA Outdoor Units (May 2024) (Mitsubishi Electric, PUZ-HA24NHA1, PUZ-HA30NKA, PUZ-HA36NKA, PUZ-HA42NKA1 heat-pump outdoor units) · checked 2026-08-25