Bosch Climate 5000 Series Service Manual page 67

4-way Valve Check
1. Power on, use a digital tester to measure the voltage, when the unit operates
in cooling, it is 0V. When the unit operates in heating, it is about 230VAC.
If the value of the voltage is not in the range, the PCB must have problems
and need to be replaced.
Figure 66
Figure 67
Bosch Wall Mounted Ductless Split Air Conditioner / Heat Pump IDU-ODU - BTC 769102301 A (11.2022)
2. Turn off the power, use a digital tester to measure the resistance. The value
should be 1.8~2.5 KΩ.
Figure 68
Service Manual
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