Midea V4+R Series, Service Manual

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V4+R VRF 50/60Hz
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4.17 xP3 Troubleshooting
Digital display output 4.17.1
'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.
Description 4.17.2

1P3 indicates current protection on compressor A.

2P3 indicates current protection on compressor B.

When the compressor current rises above the protection value (E655DHD-65: 21A; E405DHD-36: 12A), 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.
Possible causes 4.17.3

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.

Poor condenser heat exchange.

High pressure side blockage.

Inverter module damaged.

Compressor damaged.

Main PCB damaged.
Procedure 4.17.4
xP3
ODU stop valves are closed
Yes
Open the stop valves
No
The indoor load is too large
1
Yes
Make sure the combination ratio is less
than 130%
No
The power supply is abnormal
Yes
Check the power supply equipment
No
Sudden interruption of power to IDUs
Yes
Inspect the system and fix the error
No
Flowchart continued on next page …