49Installation and maintenance instructions ecoTEC 0020029172_03
10 Replacing components
The tasks listed below in this section may be carried out
only by a qualified heating engineer.
• Only use genuine spare parts for repairs.
• Make sure the parts are correctly fitted and that their
original position and alignment are retained.
10.1 Safety instructions
d
Danger!
Each time components are replaced, comply
with the safety instructions below for your own
safety and to avoid damage to the boiler.
• Take the boiler out of operation.
e
Danger!
Risk of fatal electric shock through contact
with live connections!
Disconnect the boiler from the power mains by
de-energising the boiler using an isolating
device with a contact opening of at least 3 mm
(e.g. fuses or power switches).
• Close the gas isolation valve and the service valves in
the heating flow and return.
• Close the service valve in the cold water supply pipe.
• Empty the boiler if you want to replace water-bearing
components of the boiler!
• Make sure that water does not drip on live
components (e.g. the electronic box)!
• Use only new seals and O-rings!
• After completing the work, perform a tightness check
and function check (see Chapter 6.4)
10.2 Replacing the burner
d
Danger!
Before replacing the component, observe the
safety information in Chapter 10.1.
• Dismount the compact thermal module as described in
Chapter 8.3.1.
1
Fig. 10.1 Replacing the burner
• Release the four screws (1) on the burner, and remove
the burner.
• Mount the new burner with a new seal. Make sure the
seal notch for the inspection glass fits into the notch
of the burner flange.
• Re-install the compact thermal module as described in
Chapter 8.3.4.
• After completing the work, perform a gas-tightness
check and function check (see Chapter 8.10).
10.3 Replacing the fan or the gas valve
d
Danger!
Before replacing the component, observe the
safety information in Chapter 10.1.
• Disconnect the boiler from the power mains as
described in Chapter 10.1, and close the gas isolation
valve.
• Remove the air intake pipe (1, Fig. 8.2).
• Disconnect the gas supply pipe at the gas valve
(6, Fig. 10.3).
Replacing components 10
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