6 720 611 447 GB (03.11)
Maintenance
37
9.1 Pre-Service Check List
Date
1 Call up the last fault stored by the text
display, (see page 30).
2 Check ionisation current, Service
Function 3.3, (see page 38).
3 Perform visual check of air/flue duct.
Visual check of diaphragm for soiling
and splits (see page 40).
4 Check gas supply pressure
(see page 33).
mbar
5 Test combustion air/flue gas
(see page 35).
6 Check CO
2
setting for min./
max. (gas/air ratio)
(see page 33).
min. %
max. %
7 Check gas and water systems for
leaks (see page 15).
8 Check hot water outlet temperature
(see page 38).
9 Check heat exchanger
(see page 38).
mbar
10 Check burner (see page 39).
11 Clean condensation trap
(see page 40).
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