Diagnosis And Solution - Bosch Climate 5000 Series Service Manual

Service Manual

8.5 Diagnosis and Solution

8.6.1 EEPROM parameter error (EC 51)
Error Code
Malfunction decision conditions
Supposed causes
Table 31
Troubleshooting:
Power off, then restart the
unit 3 minutes later.
If error continues
Replace the outdoor
main PCB.
Figure 46
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.
Figure 47
The photo above is for reference only, it may not be identical to the
PCB shipped with your equipment.
5 2 |
EC 51
Outdoor PCB main chip does not receive feedback from EEPROM chip.
Incorrect installation of indoor to outdoor control wire or line voltage wiring
f
PCB faulty
f
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)