6 720 611 447 GB (03.11)
36
Maintenance
9 Maintenance
B The User should be recommended to have the appli-
ance serviced regularly by a competent person.
B Use only genuine spare parts
B Refer to the Spare Parts List when ordering spare
parts.
B Always renew seals and O-rings removed during
servicing or repair work.
B Use only the following types of grease:
– Water valve: WRAS approved silicon based
grease
– Unions: approved sealant.
B To drain the appliance shut the system valves and
open the pressure relief valve.
B Upon completion of any electrical work check for
earth continuity, correct polarisation and resistance
to earth.
Replace the text display module or the Heatronic
PCB
If the text display module is replaced, the service func-
tion settings are retained.
B The remaining settings have to be re-entered.
If the Heatronic PCB is replaced:
B Re-enter the service function settings as recorded in
the commissioning record.
B Always disconnect the appliance from
the electrical power supply (fuse, circuit
breaker) before carrying out any work on
the electrical systems or components.
B Always turn off the gas cock before car-
rying out any work on components
which carry gas.
i
There is a Service booklet for the Engi-
neer, order no. 7-181-465-349, available
to competent persons.
i
All safety and control systems are moni-
tored by the Bosch Heatronic. In the event
of a component fault, the text display
shows a fault code.
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