2.17 P1: Discharge pipe high pressure protection
Digital display output
Description
All units stop running.
Error code is only displayed on the unit with the error.
Trigger / recover condition
Trigger condition: Discharge pressure ≥ 4.3MPa.
Recover condition: Discharge pressure ≤ 4.0MPa for 2 minutes.
Reset method: Resume automatically.
Possible causes
Outdoor unit stop valves are closed.
High pressure sensor not connected properly or has malfunctioned.
Excess refrigerant.
System contains air or nitrogen.
High pressure side blockage.
Poor condenser heat exchange.
Main PCB damaged.
Procedure
ODU stop valves are closed
High pressure sensor connection on main
High pressure sensor has failed
P1
No
PCB is loose
1
No
2
No
Yes
Open the stop valves
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
93
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