Bosch BMS500-AAU009-0AHXXA Service Manual page 32

3 2 | Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump
8.3.4 Fan speed has been out of control diagnosis and solution(E3)
Error Code
Malfunction decision conditions
Supposed causes
Table 17
Troubleshooting:
Power off, then restart the
unit 2 minutes later
Shut off the power supply,
Rotate the fan by hand.
Check the wiring of fan
Measure the
voltage from the main
Replace the fan motor
Figure 25
Data subject to change
E3/F5
When indoor fan speed is too low (300RPM) for certain time, the unit will stop and the LED will display
the failure.
Wiring mistake
Fan assembly faulty
Fan motor faulty
PCB faulty
Yes
Yes
motor
Yes
fan motor
PCB
Yes
No The unit operates normally.
Find out the cause and have
No
it solved
Correct the connections.
No
No Replace the main PCB
No
Service Manual
02.2018 | Bosch Thermotechnology Corp.