Errors Not Shown On Display - Bosch SSB85 Service Manual

9 .11

Errors not shown on display

Symptoms
Combustion noise too loud; rumbling noises
Flow noises
Heating-up takes too long
Flue gas readings incorrect; CO levels too high
Hard ignition, poor ignition
Tab. 15
SSB
Possible solutions
Check gas type.
Check inlet gas pressure; adjust as needed. Check flue gas system; clean or repair as needed.
Check gas/air ratio in the combustion air and flue gas; replace gas valve as needed.
Set pump speed correctly to match maximum output.
Set pump mode.
Purge system.
Set pump speed correctly to match maximum output.
Set pump mode.
Check gas type.
Check inlet gas pressure; adjust as needed.
Check flue gas system; clean or repair as needed.
Check gas/air ratio in flue gas; replace gas valve as needed.
Check gas type.
Check inlet gas pressure; adjust as needed.
Check power supply.
Check electrodes for visual damage; replace as needed.
Check flue gas system; clean or repair as needed.
Check gas/air ratio; replace gas valve as needed.
Check gas valve; replace as needed.
Check burner; replace if required.
Electrical supply | 35
6720866940 (2017/11) US