Midea V6 Series Service Manual page 116

2.19 P1: Discharge pipe high pressure protection
2.19.1 Digital display output
2.19.2 Description
 Discharge pipe high pressure protection. If the system has a 3-phase protector and the 3-phase protector is connected
with the high pressure switch, the system will display P1 protection when initially powered on, and P1 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.
2.19.3 Trigger / recover condition
 Trigger condition: Discharge pressure ≥ 4.4MPa.
 Recover condition: Discharge pressure ≤ 3.2MPa.
 Reset method: Resume automatically.
2.19.4 Possible causes
 Outdoor unit stop valves are closed.
 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.
2.19.5 Procedure
ODU stop valves are closed
High pressure sensor connection on main
High pressure sensor has short-circuited
P1
No
1
PCB is loose
No
2
or failed
No
Yes
Open the stop valves
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
V6 VRF 50Hz
Flowchart continued on next page ...
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