Bosch ZSB 30-2 A Operations Instructions download pdf (Page 68)

68 | Fault mode

6 720 644 143 (2010/09)

E9 Heat exchanger temperature limiter or

flue gas temperature limiter has tripped.

B Check heat exchanger temperature limiter and lead for

breaks or short circuits; replace if required.

B Check flue gas temperature limiter and lead for breaks

or short circuits; replace if required.

B Check the operating pressure of the heating system.

B Check temperature limiter; replace if required.

B Check pump starter; replace pump if required.

B Check PCB fuse; replace if required.

B Vent appliance.

B Check heat exchanger on the water side; replace if

required.

B On appliances with displacement bodies in heat

exchanger, check whether displacement bodies are

fitted.

EA Flame not detected. B Check earth lead is correctly connected.

B Check whether gas valve is open.

B Check gas supply pressure; correct if required.

B Check power supply.

B Check electrodes with lead; replace if required.

B Check flue gas system; clean or repair if required.

B Check gas/air ratio; correct if required.

B For natural gas: Check external gas flow limiter; replace

if required.

B For open flue operation, check air supply or ventilation

apertures.

B Clean out condensation trap discharge pipe.

B Remove diaphragm from fan inlet connection and check

for contamination or tears.

B Clean heat exchanger.

B Check gas valve; replace if required.

B Plug in boiler coding card correctly; replace if required.

B Two-phase network (IT): 2 M Ω - insert resistance

between PE and N at PCB power supply.

F0 Internal fault. B Press reset for 3 seconds and release. When the button

is released, the appliance will restart.

B Check electrical plug-in contacts and ignition leads;

replace PCB if required.

B Check gas/air ratio; correct if required.

F1 Internal data error. B Restore Heatronic 3 to standard settings (Æservice

function 8.E).

F7 A flame is detected although the

appliance is switched off.

B Check electrodes; replace if required.

B Check flue gas system; clean or repair if required.

B Check PCB for moisture; dry if required.

Display

code Description Remedy

Table 27 Faults shown on the display

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 79 80

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Bosch ZSB 30-2 A Operations Instructions Page 68

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