Midea ATOM B Series Service Manual page 67

Atom B Series VRF 50/60Hz
2.18 P1: Discharge pipe high pressure protection (For all models)
2.18.1 Digital display output
P1
2.18.2 Description
 Discharge pipe high pressure protection.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.18.3 Trigger / recover condition
 Trigger condition: Discharge pressure ≥ 4.4MPa.
 Recover condition: Discharge pressure ≤ 3.2MPa.
 Reset method: Resume automatically.
2.18.4 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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