Sinclair SDV5 Series Service Manual page 60

2.17 P2: Suction pipe low pressure protection (For all models)
2.17.1 Digital display output
P2
2.17.2 Description
 Suction pipe low pressure protection.
 The system stops running.
 Error code is displayed on outdoor unit PCB.
2.17.3 Trigger / recover condition
 Trigger condition: Suction pressure ≤ 0.05MPa.
 Recover condition: Suction pressure ≥ 0.15MPa.
 Reset method: Resume automatically.
2.17.4 Possible causes
 Insufficient refrigerant.
 Low pressure side blockage.
 Poor evaporator heat exchange.
 Main PCB damaged.
2.17.5 Procedure
the outdoor ambient temperature is too
Low pressure sensor connection on main
Low pressure sensor has short-circuited or
Insufficient refrigerant caused by
refrigerant leakage
The low pressure side is blocked, caused by
crushed or bent pipe, blocked EXV, or dirty
The evaporator heat exchange is poor
Replace outdoor main PCB
P2
low
No
PCB is loose
No
1
failed
No
2
No
3
filter
No
4
No
Yes
Stop the unit
Yes
Ensure the sensor is connected properly
Yes
Replace the sensor
Add refrigerant or inspect the system for
Yes
Inspect the system and fix the error. If the
Yes
filter is blocked by ice, the piping should be
Yes
Inspect the system and fix the error
leaks
cleaned
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