Sinclair SDV5 Series Service Manual page 67

2.21.5 Procedure
T2
temperature
sensor fault
2.22 PL: Radiator surface high temperature protection (For all models)
2.22.1 Digital display output
PL
2.22.2 Description
 Radiator surface high temperature protection.
 The system stops running.
 Error code is displayed on outdoor unit PCB.
2.22.3 Trigger / recover condition
 Trigger condition: Radiator surface temperature TF≥90℃.
 Recover condition: Radiator surface temperature TF≤84℃.
 Reset method: Resume automatically.
2.22.4 Possible causes
 Refrigerant leakage/ Poor condenser heat exchange/ System blockage.
 The connection between refrigerant cooling tube and radiator is loose.
 Main PCB damaged.
66
PE
Check whether average
temperature T2 of evaporator is
over 63 degrees
Test the temperature sensor
No resistance to check whether it's
corresponding to the actual
temperature.
Indoor unit main control board
damaged
Yes
Yes
Yes
Check whether indoor side
temperature is over the permit
operation range
No
Whether the heat exchanger
needs cleaning.
No
Whether the refrigerant pipe is
blocked
Yes
Remove the refrigerant pipe and
then use high pressure nitrogen
or refrigerant to blow the pipe.
Vacuums the pipe then add the
refrigerant again.