Bosch BMS500-AAU009-0AHXXA Service Manual page 34

3 4 | Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump
8.3.5 Open circuit or short circuit of temperature sensor diagnosis and
solution(E5)
Error Code
Malfunction decision conditions
Supposed causes
Table 20
Troubleshooting:
Measure the resistance value
of the sensor and compare to
the values in Appendix 1
(pg.44) and Appendix 2
(pg.45). Does the reading
agree with the table?
Figure 27
Data subject to change
E4/E5/F1/F2/F3
If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.
Check the connection
between temperature
sensor and PCB.
Yes
Yes
Replace indoor or outdoor
main PCB
Wiring mistake
Sensor faulty
No
Correct the connection
No
Rep a l ce the sensor
Service Manual
02.2018 | Bosch Thermotechnology Corp.