Midea ATOM MDV-V56WDHN1(AtB) - Page 71

Atom B Series VRF 50/60Hz
70
Midea
Atom B
Series
Service Manual
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
1
.
 Recover condition: Current of compressor < C
1
.
 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.
 Poor condenser heat exchange.
 High pressure side blockage.
 Inverter module damaged.
 Compressor damaged.
 Main PCB damaged.
2.19.10 Procedure
P3
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
Excess refrigerant
2
Yes
Discharge part of the refrigerant. Add oil
if it leaks during discharge
No
System contains air or nitrogen
3
Yes
Flush all refrigerant then vacuum the
system and recharge refrigerant. Add oil
to the system if it leaks