Midea V4+R Series - 4.14 P0, P4, H6 Troubleshooting; 4.14.1 Digital display output; 4.14.2 Description; 4.14.3 Possible causes

V4+R VRF 50/60Hz
201608 75
Part 5 - Diagnosis and Troubleshooting
4.14 P0, P4, H6 Troubleshooting
Digital display output 4.14.1
Description 4.14.2
 P0 indicates compressor temperature protection.
 P4 indicates discharge temperature protection. When the discharge temperature rises above 115°C the system
displays P4 protection and all units stop running.
 H6 indicates P4 protection has occurred 3 times in 100 minutes. When an H6 error occurs, a manual system restart is
required before the system can resume operation.
 Error code is only displayed on the unit with the error..
Possible causes 4.14.3
 Outdoor unit stop valves are closed.
 Temperature sensor/switch not connected
properly or has malfunctioned.
 Insufficient refrigerant.
 System blockage.
 Indoor load too large.
 System contains air or nitrogen.
 Poor condenser heat exchange.
 Main PCB damaged.
Procedure 4.14.4
P0 / P4 / H6
ODU stop valves are closed
Yes
Open the stop valves
No
Compressor top temperature sensor,
discharge pipe temperature sensor
and/or discharge temperature switch
connections on main PCB are loose
1
Yes
Ensure the sensors and switch(es) are
connected properly
No
Compressor top temperature sensor
and/or discharge pipe temperature
sensor have short circuited or failed
2
Yes
Replace the faulty sensor(s)
No
Flowchart continued on next page …