Sinclair SDV5 Series Service Manual page 64

be higher than normal, abnormal compressor noise and an unsteady pressure meter reading.
6. In cooling mode check outdoor heat exchangers, fans and air outlets for dirt/blockages. In heating mode check indoor heat exchangers, fans and air outlets
for dirt/blockages.
2.19 P5: Outdoor heat exchanger temperature protection (For all models)
2.19.1 Digital display output
P5
2.19.2 Description
 Outdoor heat exchanger temperature protection.
 The system stops running.
 Error code is displayed on the unit with the error.
2.19.3 Trigger / recover condition
 Trigger condition: Outdoor heat exchanger temperature (T3) ≥ 62
 Recover condition: Outdoor heat exchanger temperature (T3) < 52
 Reset method: Resume automatically.
2.19.4 Possible causes
 Temperature sensor not connected properly or has malfunctioned.
 Indoor load too large.
 System contains air or nitrogen.
 Poor condenser heat exchange.
 High pressure side blockage.
 Main PCB damaged.
2.19.5 Procedure
Outdoor heat exchanger temperature
sensor connection on main PCB is loose
Outdoor heat exchanger temperature
sensor has short-circuited or failed
The indoor load is too large
System contains air or nitrogen
The condenser heat exchange is poor
P5
No
1
No
2
No
3
No
4
No
o
C.
o
C.
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
Make sure the combination ratio is less than
Yes
Flush all refrigerant then vacuum the system and
Yes
recharge the refrigerant. Add oil to the system if it
Yes
Inspect the system and fix the error
130%
leaks
63