SSB 6720866940 (2017/11) US
Electrical supply | 35
9.11 Errors not shown on display
Symptoms Possible solutions
Combustion noise too loud; rumbling noises
Check gas type.
Check inlet gas pressure; adjust as needed. Check ue gas system; clean or repair as needed.
Check gas/air ratio in the combustion air and ue gas; replace gas valve as needed.
Flow noises
Set pump speed correctly to match maximum output.
Set pump mode.
Purge system.
Heating-up takes too long
Set pump speed correctly to match maximum output.
Set pump mode.
Flue gas readings incorrect; CO levels too high
Check gas type.
Check inlet gas pressure; adjust as needed.
Check ue gas system; clean or repair as needed.
Check gas/air ratio in ue gas; replace gas valve as needed.
Hard ignition, poor ignition
Check gas type.
Check inlet gas pressure; adjust as needed.
Check power supply.
Check electrodes for visual damage; replace as needed.
Check ue 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.
Tab. 15
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