BGH BSBSIC24CTK Manual page 42

5. E4 malfunction
Judge 1: Outdoor condenser temp. sensor (T3) is malfunction
Check whether the wiring of the condenser temp. sensor is broken off
Check whether the resistance of condenser temp. sensor is wrong
Judge 2: Outdoor ambient temp. sensor (T4) is malfunction
Check whether the wiring of the outdoor ambient temperature sensor (T4) is
Check whether the resistance of outdoor ambient temperature sensor
(T4) is wrong refer to the Annex 1
38
E4 display
No
refer to the Annex 1
No
broken off
No
No
Replace PCB
Yes
Connect the wiring well
Yes
Replace condenser temp. sensor
Yes
Connect the wiring well
Yes
Replace outdoor ambient temperature sensor
Troubleshooting
(T4)