Bosch Climate 5000 Series Service Manual page 50

5 0 | Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units
8.6.6 PFC module protection error (E6)
Error Code
Malfunction decision conditions
Supposed causes
Table 24
Troubleshooting:
PFC module protection
Check whether the
connecting line between
main board and the PFC
module (IPM module) is
connected tightly
Check whether the voltage
range of P-N on IPM
module is normal? DC277-
356V for 18K & 27K models,
DC 277-410V for 36K model
Check whether the
inductance of PFC module
is good? If the inductance is
good, the resistance of the
two ports should be 0
Replace the PFC module (IPM
Figure 56
Data subject to change
E6
When the voltage signal that PFC sends to main control board is abnormal, the display LED will show
"E6" and AC will turn off.
Improper / Incorrect Wiring
Outdoor PCB faulty
PFC module inductance faulty
PFC module faulty
No
Yes
No
Yes
No
No
Yes
module)
Connect it tightly, check
if connection is normal
Replace the outdoor main board
Replace the inductance
Service Manual
Yes
Problem is solved
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