6 720 611 400 GB (03.11)
36
Maintenance
9.1
Pre-Service Check List
Date
1
Call up the last fault stored by the text
display, (see page 29).
2
Check ionisation current, Service
Function
3.3
, (see page 37).
3
Perform visual check of air/flue duct.
Visual check of diaphragm for soiling
and splits (see page 39).
4
Check gas supply pressure
(see page 32).
mbar
5
Test combustion air/flue gas
(see page 34).
6
Check CO
2
setting for min./
max. (gas/air ratio)
(see page 32).
min. %
max. %
7
Check gas and water systems for
leaks (see page 15).
8
Check hot water outlet temperature
(see page 37).
9
Check heat exchanger
(see page 37).
mbar
10 Check burner (see page 38).
11 Clean condensation trap
(see page 39).
12 Check charge pressure of
expansion vessel matches
static head of heating system.
mbar
13 Check central heating system
pressure.
mbar
14 Check electrical wiring for damage.
15 Check heating programmer settings in
the text display.
16 Check appliances that are part of
the heating system.
Table 17