Diagnosis And Solution - Bosch BMS500-AAU009-0AHXXA Service Manual

2 8 | Bosch Climate 5000 AA Series Split Type Ductless Air Conditioner / Heat Pump

8.3 Diagnosis and solution

8.3.1 EEPROM parameter error diagnosis and solution(E0/F4)
Error Code
Malfunction decision conditions
Supposed causes
Table 14
Troubleshooting:
Power off, then restart the
unit 2 minutes later.
If error continues
Replace the outdoor
main PCB.
If error continues
Replace the indoor
main PCB.
Figure 20
EEPROM: a read-only memory whose contents can be erased and reprogrammed
using a pulsed voltage. For the location of EEPROM chip, please refer to
the below photos.
Indoor PCB
Figure 21
The two photos above are for reference only, they may not be identical to
the PCBs in shipped with your equipment.
Data subject to change
E0 (indoor) / F4 (outdoor)
Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip.
Incorrect installation of indoor to outdoor control wire or line voltage wiring
PCB faulty
Outdoor PCB
02.2018 | Bosch Thermotechnology Corp.
Service Manual