3
6155049
Safety instructions
(cont.)
Safety instructions for working on the system
■
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.
Note
In addition to the control circuit, there
may be several power circuits.
Danger
Contact with live components can
result in severe injuries. Some
components on PCBs remain live
even after the power supply has
been switched off. Wait at least
4 minutes until the voltage has
completely dropped out before
removing the covers from the
appliances.
■
Safeguard the system against
reconnection.
■
Wear suitable personal protective
equipment when working on the
system.
Working on the system
Safety instructions
Caution
Electronic assemblies can be
damaged by electrostatic discharge.
Prior to commencing any work,
touch earthed objects such as
heating or water pipes to discharge
static loads.
Danger
Hot surfaces and fluids can cause
burns or scalding.
■
Before maintenance and service
work, switch OFF the appliance
and let it cool down.
■
Never touch hot surfaces on the
appliance, fittings or pipework.
Caution
Repairing components that fulfil
a safety function can compromise
the safe operation of the system.
Replace faulty components only
with genuine Viessmann spare
parts.
Caution
Spare and wearing parts that have not
been tested together with the system
can compromise its function. Installing
non-authorised components and
making non-approved modifications
or conversions can compromise
safety and may invalidate our
warranty. For replacements, use
only original spare parts supplied
or approved by Viessmann.
Maintenance
Auxiliary components, spare and
wearing parts
Danger
If water escapes from the appliance
there is a risk of electric shock. Switch
OFF the heating system at the external
isolator (e.g. fuse box, domestic
distribution board).
Danger
If water escapes from the appliance
there is a risk of scalding. Never
touch hot heating water.
Safety instructions for operating the system
What to do if water escapes from the
appliance