Fisher FSKIF-121AE2-EU Service Manual page 146

Troubleshooting
2.4.4.4. F1, F2, F3 malfunction
Error
E4 display
Judge 1: Outdoor condenser temp. sensor (T3) is malfunction
Check whether the wiring of the
condenser temp. sensor(T3) is
broken off
Check whether the resistance of
condenser temp. sensorT3) is wrong
refer to the Appendix 1
Judge 2: Outdoor ambient temp. sensor (T4) is malfunction
Check whether the wiring of the
outdoor ambient temperature
sensor (T4) is broken off
Check whether the resistance of
outdoor ambient temperature
sensor (T4) is wrong refer to the
Appendix 1
Judge 3: Compressor discharge temp. sensor (T5) is malfunction
Check whether the wiring of the
compressor discharge temperature
sensor (T5) is broken off
Check whether the resistance of
compressor discharge temp. sensor
(T5) is wrong refer to the Appendix 2
Replace outdoor main PCB
142
Yes
No
Yes
No
Yes
No
Yes
No
No
No
F1
Connect the wiring well
Replace condenser temp. sensor(T3)
F2
Connect the wiring well
Replace outdoor ambient
temperature sensor (T4)
F3
Yes Connect the wiring well
Replace compressor discharge
Yes
temperature sensor (T5)
Electrical Control System