6 720 610 576 GB (02.05)
Maintenance
33
8.1
Pre-Service Check List
Date
1
Call up the last fault stored by the
Bosch Heatronic, Service Function
.0,
(see page 34).
2
Check ionisation current, Service
Function
3.3
, (see page 34).
3
Perform visual check of air/flue
duct.Visual check of diaphragm for
soiling and splits (see page 36).
4
Check gas supply pressure
(see page 29).
mbar
5
Test combustion air/flue gas
(see page 31).
6
Check CO
2
setting for min./
max. (gas/air ratio)
(see page 29).
min. %
max. %
7
Check gas and water systems for
leaks (see page 16).
8
On combi models, check hot water
outlet temperature (see page 34).
9
Check heat exchanger
(see page 34).
mbar
10 Check burner (see page 35).
11 Clean condensation trap
(see page 36).
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.
16 Check appliances that are part of
the heating system
Table 16
