6 720 611 451 GB (03.11)
34
Maintenance
8 Maintenance
B The User should be recommended to have the appli-
ance serviced regularly by a competent person (see
Maintenance Contract).
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.
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 special Service booklet for the
Engineer, order no. 7-181-465-348, avail-
able to competent persons.
i
All safety and control systems are moni-
tored by the Bosch Heatronic. In the event
of a component fault, the display shows a
fault code.
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