Service work on the heating system
&
Isolate the sy stem from mains sup-
ply, e.g. by removing a s eparate
fuse or by means of a mains electri-
cal isolator and chec k that it is no
longer 'liv e'.
&
Safeguard the system against
unauthorised reconnection.
&
When usin g gas as fuel, al so close
the main gas shut-off valve and
safeguard against unauthorised
reopening.
Repair work
!
Important information
Repairing components which
fulfil a safety fu nction can com-
promise the safe operation of
your heating system.
Replace fau lty compone nts
only with original Viessmann
spare parts.
Ancillary components, spar e and
wearing parts
!
Important information
Components which are not
tested with the heating system,
the installation of non-
approved spare parts and
unauthor ised conversi on may
lead to damage to the heating
system, which may affect their
function and limi t our w arranty.
For conversions or replace-
ments, use onl y original s pare
parts from Viessmann or those
which are approved by Viess-
mann.
Safety instructions (cont.)
3
Safety instructions
5692 537 GB
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