Midea ATOM B Series Service Manual page 71

Atom B Series VRF 50/60Hz
2.17 P3: Compressor current protection (For all models)
2.19.6 Digital display output
P3
2.19.7 Description
 P3 indicates current protection on compressor.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.19.8 Trigger / recover condition
 Trigger condition: Current of compressor ≥ C
 Recover condition: Current of compressor < C
 Reset method: Resume automatically.
Notes:
1. 28 model in cooling mode C=19A, 28 model in heating mode C=20A; 36 model C=24A; 42 model C=29A; 48-52 model C=33A)
2.19.9 Possible causes
 Indoor load too large.
 Power supply abnormal.
 Sudden interruption of power to IDUs.
 Excess refrigerant.
 System contains air or nitrogen.
2.19.10 Procedure
The indoor load is too large
The power supply is abnormal
Sudden interruption of power to IDUs
Excess refrigerant
System contains air or nitrogen
70
1
.
1
.
P3
1
No
No
No
2
No
3
 Poor condenser heat exchange.
 High pressure side blockage.
 Inverter module damaged.
 Compressor damaged.
 Main PCB damaged.
Make sure the combination ratio is less
Yes
than 130%
Yes
Check the power supply equipment
Yes
Inspect the system and fix the error
Discharge part of the refrigerant. Add oil
Yes
if it leaks during discharge
Flush all refrigerant then vacuum the
Yes
system and recharge refrigerant. Add oil
to the system if it leaks