Bosch Singular 4000 Service Manual page 22
Gas condensing combi boilers
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Also See for Singular 4000:
- Installation instructions manual (68 pages) ,
- User manual (20 pages)
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Service Manual
A3 Error - Wire Check
1. Check the pump connector.
Figure 11
2 2 |
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
Singular Combi Boiler - BTC 439002301 A (12.2021)
V
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