Bosch Climate 5000 Series Service Manual page 69

Service Manual Bosch Climate 5000 Series Ductless Air Conditioner / Heat Pump Multi Zone Outdoor Units | 69
4. Four - Way Valve
Step 1. Power on, use a digital tester to measure the voltage. When the unit
operates in cooling mode, value should be 0V. When the unit operates in heating
mode, the value should be about 230VAC.
If the value of the voltage is not in the range, the PCB may have problems and need
to be replaced.
Figure 76
Step 2. Turn off the power, use a digital tester to measure the resistance. The value
should be between 1.8~2.5 K .
Figure 77
Bosch Thermotechnology Corp. | 08.2020
Data subject to change