Working on the heating system
&
Isolate the system from the mains
electric power supply, e.g. by
removing 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 reopen-
ing.
Repair work
!
Important information
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
!
Important information
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 condi-
tions.
For replacements, use only ori-
ginal spare parts from
Viessmann or those which are
approved by Viessmann.
Safety instructions
(cont.)
3
Safety instructions
58
62
670
GB
