Judge 1: Outdoor condenser temp. sensor (T3) is malfunctioning
Judge 1: Outdoor condenser temp. sensor (T3) is malfunctioning
E4 displayed
E4 displayed
No
No
Replace condenser temp. sensor (T3)
Replace condenser temp. sensor (T3)
Is the wiring of the condenser temp.
sensor (T3) not connected properly?
Is the wiring of the condenser temp.
sensor (T3) not connected properly?
Is the resistance of condenser temp.
sensor (T3) wrong according to
Appendix 1?
Is the resistance of condenser temp.
sensor (T3) wrong according to
Appendix 1?
Yes
Reconnect the condenser
temp. sensor (T3)
Reconnect the condenser
temp. sensor (T3)
Yes
Judge 2: Outdoor ambient temp. sensor (T4) is malfunctioning
Judge 2: Outdoor ambient temp. sensor (T4) is malfunctioning
No
Replace the outdoor ambient
temperature sensor (T4)
Replace the outdoor ambient
temperature sensor (T4)
Is the wiring of the outdoor ambient
temperature sensor (T4) not
connected properly
Is the wiring of the outdoor ambient
temperature sensor (T4) not
connected properly
Is the resistance of the outdoor
ambient temperature sensor (T4)
wrong according to Appendix 1?
Is the resistance of the outdoor
ambient temperature sensor (T4)
wrong according to Appendix 1?
Yes
Reconnect the wiring
Reconnect the wiringYes
Judge 3: Compressor discharge temp. sensor (T5) is malfunctioning
Judge 3: Compressor discharge temp. sensor (T5) is malfunctioning
No
Replace the compressor
discharge temperature sensor
(T5)
Replace the compressor
discharge temperature sensor
(T5)
Is the wiring of the compressor
discharge temperature sensor (T5)
disconnected?
Is the wiring of the compressor
discharge temperature sensor (T5)
disconnected?
Is the resistance of compressor
discharge temp. sensor (T5) wrong
according to Appendix 2?
Is the resistance of compressor
discharge temp. sensor (T5) wrong
according to Appendix 2?
Yes
Reconnect the wiring
Reconnect the wiringYes
No
Replace outdoor main PCB
Replace outdoor main PCB
No
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