Midea MV5-X252W/V2GN1 Service Manual page 89

V5 X VRF 50/60Hz
4.18 xP3 Troubleshooting
4.18.1 Digital display output
'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing
compressor system A and 2 representing compressor system B.
4.18.2 Description
 1P3 indicates current protection on compressor A.
 2P3 indicates current protection on compressor B.
 When the compressor current rises above the protection value (E705DHD-72: 23A; E655DHD-65: 21A; E405DHD-36:
12A; E405DHD-42: 15A), the system displays P3 protection and all units stop running. When the current returns to the
normal range, P3 is removed and normal operation resumes.
 Error code is only displayed on the unit with the error.
4.18.3 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.
4.18.4 Procedure
ODU stop valves are closed
The indoor load is too large
The power supply is abnormal
Sudden interruption of power to IDUs
88
xP3
No
1
No
No
No
 Poor condenser heat exchange.
 High pressure side blockage.
 Inverter module damaged.
 Compressor damaged.
 Main PCB 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
Flowchart continued on next page ...
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