Midea V6R VRF Series Service Manual page 129

V6R VRF 50Hz
2.21 P31: Primary current protection
Digital display output
Description
 All units stop running.
 Error code is displayed on the unit with the error.
Trigger / recover condition
 Trigger condition: Refer to Part 3 6.4 Over-current Protection Control
 Recover condition: Refer to Part 3 6.4 Over-current Protection Control
 Reset method: Resume automatically.
Possible causes
 Outdoor unit stop valves are closed.
 Indoor load too large.
 Power supply abnormal.
 Sudden interruption of power to IDUs.
 Excess refrigerant.
 System contains air or nitrogen.
Procedure
ODU stop valves are closed
The indoor load is too large
The power supply is abnormal
Sudden interruption of power to IDUs
128
P31
No
1
No
No
No
 Poor condenser heat exchange.
 High pressure side blockage.
 Inverter module damaged.
 Compressor damaged.
 Outdoor main PCB damaged.
 DC fan drive board damaged.
Yes
Open the stop valves
Make sure the combination ratio is less
Yes
than 130%
Yes
Check the power supply equipment
Yes
Inspect the system and fix the error
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