BGH BV-V28W/DHN1 Service Manual page 67

2.16 P1: Discharge pipe high pressure protection (for 36-56 model)
2.16.1 Digital display output
P1
2.16.2 Description
• Discharge pipe high pressure protection.
• The system stops running.
• Error code is displayed on the outdoor unit PCB.
2.16.3 Trigger / recover condition
• Trigger condition: Discharge pressure ≥ 4.4MPa.
• Recover condition: Discharge pressure ≤ 3.2MPa.
• Reset method: Resume automatically.
2.16.4 Possible causes
Pressure sensor/switch not connected properly or has malfunctioned.
•
Excess refrigerant.
•
System contains air or nitrogen.
•
• High pressure side blockage.
• Poor condenser heat exchange.
• Main PCB damaged.
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