代码 H5: P2 protection appears three times in 60 minutes

Manual restart required: Yes Display: Displayed on the unit with the error Description: Suction pipe low pressure protection. If the system has a 3-phase protector and the 3-phase protector is connected to the low pressure switch, the system will display P2 protection when initially powered on, and P2 protection will disappear once the system reaches a steady state. All units stop running. Error code is only displayed on the unit with the error. Trigger condition: For P2 protection: Suction pressure ≤ 0.05MPa. For H5 protection: P2 protection appears three times in 60 minutes. Recover condition: Suction pressure ≥ 0.15MPa. Reset method: For P2 protection: Resume automatically. For H5 protection: Manually restart. Possible causes: - Outdoor unit stop valves are closed. - Insufficient refrigerant. - Low pressure side blockage. - Poor evaporator heat exchange. - Main PCB damaged.