High pressure trouble - System high pressure detected

What does 1302 (UE) mean?

This indicates that the air conditioner system has detected abnormally high pressure, either through the high-pressure switch (63H) or the high-pressure sensor (63HS). This can trigger a shutdown to protect the system.

• Defective operation of stop valve (not fully open) or clogged/broken pipe in the refrigerant circuit.
• Malfunction or locked outdoor fan motor, leading to poor heat dissipation, or short-cycling of the outdoor unit.
• Dirt or obstruction on the outdoor heat exchanger, reducing its efficiency, or decreased airflow from indoor unit issues (clogged filter, locked fan motor).
• Defective high-pressure sensor, or performance failure of the Indoor Linear Expansion Valve (LEV) or SV1 solenoid valve.

Click steps to track your progress.

1. 1

   Turn OFF the air conditioner's power supply before proceeding with any checks.

2. 2

   Verify that the outdoor stop valves (liquid/gas lines) are fully open. If closed, open them completely.

3. 3

   Check if the outdoor fan motor is rotating properly during operation and clear any obstructions around the outdoor unit.

4. 4

   Inspect the outdoor heat exchanger for dirt, debris, or blockages and clean it if necessary.

5. 5

   Check if the indoor fan motor is rotating properly and ensure indoor unit filters are clean and free of obstructions.

6. 6

   If the problem persists, contact a qualified service technician as internal components like sensors, valves, or control boards may be faulty.