Sinclair SDV5 Series Service Manual page 61

Notes:
1. Measure the resistance among the three terminals of the pressure sensor. If the resistance is of the order of mega Ohms or infinite, the pressure sensor
has failed.
2. An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than
normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once sufficient
refrigerant has been charged into the system.
3. A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and
compressor current to be lower than normal, and may cause frosting to occur on the suction pipe.
4. In cooling mode check indoor heat exchangers, fans and air outlets for dirt/blockages. In heating mode check outdoor heat exchangers, fans and air outlets
for dirt/blockages.
2.17 P3: Compressor current protection (For all models)
2.17.6 Digital display output
P3
2.17.7 Description
 P3 indicates current protection on compressor.
 The system stops running.
 Error code is displayed on the outdoor unit PCB.
2.17.8 Trigger / recover condition
 Trigger condition: Current of compressor ≥ C
 Recover condition: Current of compressor < C
 Reset method: Resume automatically.
Notes:
1. 80 model in cooling mode C=19A, 80 model in heating mode C=20A; 100 model C=24A; 120 model C=29A; 140-160 model C=33A)
2.17.9 Possible causes
 Indoor load too large.
 Power supply abnormal.
 Sudden interruption of power to IDUs.
 Excess refrigerant.
 System contains air or nitrogen.
2.17.10 Procedure
The indoor load is too large
The power supply is abnormal
Sudden interruption of power to IDUs
Excess refrigerant
60
1
.
1
.
P3
1
No
No
No
2
 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