Mitsubishi Electric UE Error Code

What does Mitsubishi Electric UE mean?

The high-pressure sensor (63HS) reported an abnormal pressure, so the control stopped the compressor and shows UE on a blinking display. The 63HS sensor continuously measures high-side pressure; a reading outside the expected range, whether from a real pressure problem or a sensor fault, triggers this protective stop to safeguard the system.

Symptoms

• UE shown on a blinking display
• Compressor stops on the protection device
• Possible high condensing pressure before shutdown
• Fault may recur soon after restart

Common causes

• Restricted condenser airflow raising high-side pressure
• 63HS high-pressure sensor faulty
• Loose or damaged 63HS sensor connector
• Refrigerant overcharge or non-condensables

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Diagnostic steps

1. Power down the unit

   Turn off the system and wait for pressures to settle.

2. Clear condenser airflow

   Clean the outdoor coil and remove obstructions so high-side pressure can stay normal.

3. Check the 63HS connector

   Verify the high-pressure sensor connector is seated and the wiring is intact.

4. Note the conditions

   Record whether UE appears at startup or under load to guide diagnosis.

5. Arrange a pressure check

   A technician should compare the 63HS reading against measured high-side pressure.

When to call a professional

Call a certified technician for UE, since confirming whether the 63HS sensor or the actual pressure is at fault requires gauges and refrigerant-handling certification. Verifying the charge, testing the sensor, and any work on the sealed circuit must be done by a qualified professional. Do not add or remove refrigerant yourself.