3
Working on the system
■
Where gas is used as the fuel, close the main gas
shut-off valve and safeguard it against unintentional
reopening.
■
Isolate the system from the power supply (e.g. by
removing the separate fuse or by means of a mains
isolator) and check that it is no longer 'live'.
■
Safeguard the system against reconnection.
Danger
Hot surfaces can cause burns.
■
Before maintenance or service work, switch
OFF the appliance and let it cool down.
■
Never touch hot surfaces on the boiler, burner,
flue system or pipework.
!
Please note
Electronic assemblies can be damaged by elec-
trostatic discharge.
Before beginning work, touch earthed objects,
such as heating or water pipes, to discharge
static loads.
Repair work
!
Please note
Repairing components that fulfil a safety func-
tion can compromise the safe operation of the
system.
Faulty components must be replaced with origi-
nal Viessmann spare parts.
Auxiliary components, spare and wearing parts
!
Please note
Spare and wearing parts that have not been tes-
ted together with the system can compromise its
function. Installing non-authorised components
and making non-approved modifications or con-
versions can compromise safety and may inva-
lidate the warranty.
For replacements, use only original spare parts
supplied or approved by Viessmann.
Safety instructions
Safety instructions (cont.)
5692 701 GB
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