Bosch Singular 4000 - Page 22

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Service Manual
Singular Combi Boiler - BTC 439002301 A (12.2021)
A3 Error - Wire Check
1. Check the pump connector.
Figure 11
A3 Error - Control Board Operation Voltage Check
1. Check the output voltage when the pump operation signal is activated
 Normal: Normal if the voltage is higher than the input voltage
Figure 12
V