Midea MV6-i900WV2GN1-E - P4, H6: Discharge Temperature Protection

V6-i VRF 50/60Hz
115
Part
6 - Diagnosis and Troubleshooting
2.19 P4, H6: Discharge temperature protection
Digital display output 2.19.1
;
Description 2.19.2
 Discharge temperature protection.
 All units stop running.
 Error code is only displayed on the unit with the error.
Trigger / recover condition 2.19.3
 Trigger condition:
For P4 protection: Discharge temperature (T7C1/2) ≥ 120
o
C.
For H6 protection: P4 protection appears three times in 100 minutes.
 Recover condition: Discharge temperature (T7C1/2) ≤ 90
o
C.
 Reset method:
For P4 protection: Resume automatically.
For H6 protection: Manually restart.
Possible causes 2.19.4
 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 2.19.5
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 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
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