Midea V6R VRF Series

V6R VRF 50Hz
132
Midea
V6R
Series Service Manual
2.23 P4, H6: Discharge temperature protection or discharge temperature switch protection
Digital display output
Description
 Discharge temperature protection.
 All units stop running.
 Error code is displayed on the unit with the error.
Trigger / recover condition
 Discharge temperature protection
 Trigger condition:
For P4 protection: Discharge temperature (T7C1) ≥ 115
o
C.
 Recover condition: Discharge temperature (T7C1) < 90
o
C.
 Reset method:
For P4 protection: Resume automatically.
 Discharge Temp. switch protection
 Trigger condition: Discharge temperature ≥ 115
o
C.
 Recover condition: Discharge temperature < 75
o
C.
 Reset method: Resume automatically.
 H6 protection
 For H6 protection: P4 protection appears three times in 100 minutes.
 Reset method:
For P4 protection: Resume automatically.
For H6 protection: Manually restart.
Possible causes
 Outdoor unit stop valves are closed.
 Temperature sensor/switch not connected
properly or has malfunction.
 Insufficient refrigerant.
 System blockage.
 Indoor load too large.
 System contains air or
nitrogen.
 Poor condenser heat exchange.
 Outdoor main PCB damaged.