Bosch Singular 4000 - Page 26

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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
A5 Error - Input Voltage of the Pressure Sensor Check
1. Check the pressure sensor for abnormalities in the input voltage
— Normal: DC 5 V
Figure 17
V
A5 Error - Pipe Pressure Check
1. Check for water leaks from the pipes and check the pressure of the expansion
tank