Faults That Are Not Shown On The Display - Bosch Greenstar FS Series Installation And Maintenance Instructions For Contractors

17.3

Faults that are not shown on the display

Appliance faults
Combustion noise too loud; rumbling noises
Flow noises
Heating-up takes too long
Flue gas readings incorrect; CO levels too high
Violent ignition, poor ignition
DHW has unpleasant odor or has a dark color
Set supply temperature (e.g. of the FW200 control)
exceeded
Condensate in air box
DHW temperature is not reached (combi boilerKWB..-3A
only)
Heatronic is flashing (i.e. all buttons, all display segments,
burner indicator etc. are flashing)
Table 41 Faults not shown on the display
Greenstar FS/Combi FS – 6 720 810 590 (2020/04)
Elimination
▶ Insert code plug correctly; replace if defective.
▶ Check gas type.
▶ Check inlet gas pressure; adjust if defective.
▶ Check flue gas system; clean or repair if defective.
▶ Check gas/air ratio in the combustion air and flue gas; replace gas valve if defective.
▶ Set pump speed correctly to match maximum output.
▶ Set pump mode.
▶ Set pump speed correctly to match maximum output.
▶ Set pump mode.
▶ Check gas type.
▶ Check inlet gas pressure; adjust if defective.
▶ Check flue gas system; clean or repair if defective.
▶ Check gas/air ratio in flue gas; replace gas valve if defective.
▶ Check gas type.
▶ Check inlet gas pressure; adjust if defective.
▶ Check power supply.
▶ Check electrodes for visual damage; replace if defective.
▶ Check flue gas system; clean or repair if defective.
▶ Check gas/air ratio; replace gas valve if defective.
▶ Check gas valve; replace if defective.
▶ Check burner; replace if required.
▶ Perform thermal disinfection of the DHW circuit.
▶ Replace sacrificial anode in the tank (if installed).
▶ Consult local water department.
▶ Switch off automatic anti-cycle timer, i.e., set value to 0.
▶ Set the required anti-cycle timer, e.g. default setting of 3 minutes.
▶ Insert diaphragm in the mixer unit per installation instructions; replace if defective.
▶ Insert code plug correctly; replace if defective.
▶ Check whether voltage (120 VAC) is present between terminal 1 and terminal 3; repair
if defective.
▶ Check turbine; replace if defective.
▶ Replace fuse Si 3 (24 V) (6.3 A fuse according to IEC default).
Faults
77