Faults That Are Shown On The Display - Bosch WBN 6000-30-H-E-N/L-S2400 Installation And Maintenance Instructions Manual

15.2 Faults that are shown on the display

Display code Description
A7 Temperature sensor for hot water is faulty.
Ad Cylinder temperature sensor not detected.
C1 Fan speed too low.
C4 The differential pressure switch will not respond if
the fan is switched off.
C6
Pressure switch not closing.
C7 Fan not running.
CE Filling pressure of the heating system is too low.
d7 Gas valve faulty.
E2 Flow temperature sensor faulty (lead break).
E9 Temperature limiter for heating block has
responded.
EA Flame not detected.
F7
A flame is detected although the appliance is
switched off.
FA A flame is detected after the gas has been switched
off.
Fan stage not selected.
P Appliance type not defined.
Fd Key was held down for too long (over 30 secs).
Table 20
Gaz 6000 W
Remedy
▶ Check the temperature sensor and connecting lead for breaks or
short-circuits; replace them if required.
Check cylinder temperature sensor and connecting lead.
▶ Check power supply.
▶ Check flue gas system; clean or repair if required.
Check pressure switch and wiring, check connection hoses.
Check fan lead and connector, check fan, replace as necessary.
Check pressure switch, sensor and connecting pipes.
Check fan lead and connector, check fan, replace as necessary.
▶ Top up the system with water.
▶ Check lead.
▶ Check gas train; replace if required.
Check the temperature sensor and connecting lead for breaks or short-
circuits.
▶ Check heat exchanger temperature limiter and lead for breaks;
replace if required.
▶ Check the operating pressure of the heating system.
▶ Check temperature limiter; replace if required.
▶ Check pump starter; replace pump if required.
▶ Check the fuse; replace if required ( page 7).
▶ Bleed the appliance.
▶ Check heating block on the water side; replace if required.
▶ Check flue gas temperature limiter and lead for breaks; replace if
required.
▶ Check earth lead is correctly connected.
▶ Check whether gas valve is open.
▶ Check gas supply pressure; correct if required.
▶ Check power supply.
▶ Check electrodes with lead; replace if required.
▶ Check flue gas system; clean or repair if required.
▶ Check gas settings; correct if required.
▶ For natural gas: Check external gas flow limiter; replace if required.
▶ For open flue operation, check air supply or ventilation apertures.
▶ Clean heat exchanger ( page 26).
▶ Check gas train; replace if required.
▶ Check electrodes for contamination; replace if required.
▶ Check flue gas system; clean or repair if required.
▶ Check PCB for moisture; dry if required.
▶ Check gas train; replace if required.
▶ Check electrodes and lead; replace if required.
▶ Check flue gas system; clean or repair if required.
▶ Select fan stage.
▶ Set appliance type ( service function 3.1.A).
▶ Press the key again for less than 30 secs.
Fault mode | 29
8 716 473 216 (2014/09)