Fault Mode; Troubleshooting - Bosch ZSB 30-2 Installation And Servicing Instructions

66 | Fault mode

17 Fault mode

17.1 Troubleshooting

DANGER: Risk of explosion!
B Turn off gas valve before working on gas-
carrying components.
B Check for leaks before working on gas-
carrying components.
DANGER: Risk of poisoning!
B Check for leaks before working on gas-
carrying components.
DANGER: Risk of electric shock!
B Before carrying out work on electrical
components, disconnect the power
supply (230 V AC) (fuse, circuit breaker)
and secure against unintentional
reconnection.
WARNING: Risk of scalding!
Hot water can cause severe scalding
B Drain the appliance before working on
components that carry water.
NOTE: Leaking water may damage the
Heatronic module.
B Cover the Heatronic module before
working on any parts that carry water.
6 720 644 143 (2010/09)
All safety, modulation and control components are
monitored by the Heatronic system.
If a fault occurs during operation, a warning tone
sounds.
If you press a button, the warning tone
stops.
The display indicates a fault (e. g.
button may also flash.
If the reset button flashes:
B Press and hold the reset button until the display
shows .
The appliance will start up again and the flow
temperature will be displayed.
If the reset button does not flash:
B Switch the appliance off and then on again at the main
switch.
The appliance will start up again and the central
heating flow temperature will be displayed.
For an overview of faults, see page 67.
For an overview of displays, see page 64.
If a fault persists:
B Check PCB, replace if required and set service
functions as per "Heatronic settings" label (
page 38).
) and the reset-
Fig. 37,