Midea MV6-R1000WV2RN1, Service Manual

Page: 133 / 167

V6R VRF 50Hz
132
Midea
V
6R
Series S
er
vice M
anual
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.