Bosch BMS500-AAU036-1AHCXC - Page 54

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Service Manual
Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units (01.2023)
Note:
f Use a multimeter to test the DC voltage between 2 (old: L2) port and 3
port of outdoor unit. The red pin of multimeter connects with 2 (old: L2)
port while the black pin is for 3 port. When AC is normal running, the
voltage will move alternately between positive value and negative value.
Figure 49
IPM board (18K & 27K Models):
Figure 50
Operang
Standby
IPM board - Regular: 36K & 48K Models / Max Performance: 27K & 36K
Models
Figure 51
Standby
Operang
Power
Operang
Figure 52
Main Board LED
Unit Standby
Power On
Figure 53
Check point
button, press
1 time to
check how
many indoor
units are
connected.