10.1.3 Faults That Are Not Displayed - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

10.1.3 Faults that are not displayed

Appliance faults
Combustion noise too loud; rumbling noises
Flow noises
Heat-up lasts too long.
Flue gas readings incorrect; CO content too high.
Ignition too strong, or poor.
Condensate in the air box
DHW outlet temperature not reached.
DHW volume not reached.
No function, the display remains dark.
Table 29 Faults that are not shown on the display
Fault display: System pressure too low
If the system pressure in the heating system falls below the minimum
pressure that has been set, the display shows the message LoPr => L0.X
bar. The system pressure is too low.
▶ Fill the heating system.
If the system pressure in the heating system drops below 0.3 bar, the
display shows the message LoPr alternating with the operating
pressure. The heating system is then blocked.
▶ Fill the heating system.
Condens 8300i W – 6721841531 (2022/10)
Remedy
▶ Check gas type.
▶ Check gas supply pressure.
▶ Check the flue system, clean or repair if required.
▶ Check the gas/air ratio.
▶ Check the air/gas ratio control valve, replace if required.
▶ Set the pump rate or pump characteristic map correctly and match to the maximum
output.
▶ Set the pump rate or pump characteristic map correctly and match to the maximum
output.
▶ Check gas type.
▶ Check gas supply pressure.
▶ Check the flue system, clean or repair if required.
▶ Check the gas/air ratio.
▶ Check the air/gas ratio control valve, replace if required.
▶ Check the ignition transformer with service function t01 for misfiring, replace if
necessary.
▶ Check gas type.
▶ Check gas supply pressure.
▶ Check the power supply.
▶ Check the electrodes with cable, replace if required.
▶ Check the flue system, clean or repair if required.
▶ Check the gas/air ratio.
▶ For natural gas: check external gas flow monitor, replace if required.
▶ Check burner. Replace if required.
▶ Check the air/gas ratio control valve, replace if required.
▶ Check non-return valve in the mixing device, replace if necessary.
▶ Check turbine. Replace if required.
▶ Check the gas/air ratio.
▶ Check the heating system pressure and adjust if necessary.
▶ Check the plate heat exchanger.
▶ Check the heating system pressure and adjust if necessary.
▶ Check electrical wiring for damage.
▶ Replace faulty cables.
▶ Check the fuse, replace if required.
Troubleshooting
55