PC30 System high pressure protection

What the control is telling you

System high pressure exceeded the limit and the compressor stopped.

Applies to: DLCURAH18-60 AAK/ABK single-zone heat pump outdoor units (18K-60K, regular and High Heat)

Likely causes

• Dirty outdoor coil or fan failure (cooling)
• Poor indoor airflow (heating) - dirty filter, closed registers
• Overcharge or non-condensables
• Refrigerant restriction
• High-pressure sensor fault

Test and repair steps

1. Warning: Turn off and lock out power at the outdoor disconnect and wait for the inverter capacitors to discharge before touching the outdoor board or compressor wiring.
2. In cooling clean the outdoor coil and check the outdoor fan.
3. In heating check indoor filter, blower and ductwork airflow.
4. Check refrigerant charge and for non-condensables.
5. Check for restrictions; confirm service valves are fully open.
6. Check the high-pressure sensor (see EC5C).

Settings for these units

Outdoor unit minimum clearances · Midea DLCURA ducted single-zone inverter heat pump (outdoor)

Side letters taken from Fig. 8 drawing.

Units facing each other: 59 in. (150 cm) or more; do not blow into another unit's inlet.

Models that show this code

12 models in Midea DLCURA ducted single-zone inverter heat pump (outdoor)

Other codes on the same units

• PC08 Outdoor over-current protection
• PC10 Outdoor low AC voltage protection
• PC11 Outdoor DC bus high voltage protection
• PC12 DC bus high voltage protection / 341 MCE error
• PC31 System low pressure protection
• PC40 Main chip to compressor-driver chip communication error
• PC42 Compressor start failure
• PC43 Compressor lack-phase protection