2.19 P1: High pressure protection
Digital display output
Description
 All units stop running.
 Error code is displayed on the unit with the error.
Trigger / recover condition
 High pressure sensor protection
 Trigger condition: Discharge pressure ≥ 3.9 MPa.
 Recover condition:
ï‚Ÿ Cooling Only/Main Cooling Discharge pressure < 3.5MPa and Restart permission=ON.
ï‚Ÿ Heating Only/Main Heating Discharge pressure < 3.1MPa and Restart permission=ON.
 Reset method: Resume automatically.
 Discharge pressure switch protection
 Trigger condition: Discharge pressure ≥ 4.0 MPa.
 Recover condition: Discharge pressure < 3.0MPa.
Possible causes
 Outdoor unit stop valves are closed.
 Pressure sensor/switch not connected properly or has malfunction.
 Excess refrigerant.
 System contains air or nitrogen.
 High pressure side blockage.
 Poor condenser heat exchange.
 Outdoor main PCB damaged.
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