Working on the heating system
&
Isolate the system from the mains
electric power supply, e.g. by remo-
ving a separate fuse or by means of
a mains electrical isolator, and
check that it is no longer 'live'.
&
Isolate the gas supply and safe-
guard against unauthorised reope-
ning.
Repair work
!
Achtung
Repairing components which
fulfil a safety function can com-
promise the safe operation of
your heating system.
Replace faulty components
only with original Viessmann
spare parts.
Ancillary components, spare and
wearing parts
!
Achtung
Spare and wearing parts which
have not been tested together
with the heating system can
compromise its function. Instal-
ling non-authorised compo-
nents and non-approved
modifications/conversion can
compromise safety and may
infringe our warranty
conditions.
For replacements, use only ori-
ginal spare parts from
Viessmann or those which are
approved by Viessmann.
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