Bosch BMS500-AAU036-1AHCXC - Page 56

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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 black pin and white pin
of signal wire. The normal value should be around 5V.
Figure 55
f Use a multimeter to test the DC voltage between black pin and red pin of
signal wire. The normal value should be approximately 12V.
Figure 56