Midea MV5-X252W/V2GN1 Service Manual page 85

V5 X VRF 50/60Hz
4.16 P1 Troubleshooting
4.16.1 Digital display output
4.16.2 Description
 Discharge pipe high pressure protection. When the discharge pressure rises above 4.4MPa, the system displays P1
protection and all units stop running. When the discharge pressure falls below 3.2MPa, P1 is removed and normal
operation resumes.
 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.
 Error code is only displayed on the unit with the error.
4.16.3 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.
4.16.4 Procedure
ODU stop valves are closed
High pressure sensor connection on main
High pressure sensor has short-circuited
Excess refrigerant
84
P1
No
1
PCB is loose
No
2
or failed
No
3
No
Yes
Open the stop valves
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
Discharge part of the refrigerant. Add oil
Yes
if it leaks during discharge
Flowchart continued on next page ...
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