81
FAULT FINDING
Does fan run after approx. 30 secs.?
Check flue and ignition system
No
Check diagnostic code D.24
(see page 53) equal 1?
Check pitot tube (in fan outlet) and air
hoses are not obstructed and correctly
aligned.
Check or replace air pressure switch.
Does the fan run now?
Is 230 V
AC present across fan
ter
minals?
Replace electronic board
Ye
s
No
No
Ye
s
No
Ye
s
Ye
s
Check/replace fan
Does the boiler
commence ignition
Check status code
(see page 52) is S.33?
Check air/flue gas system
is correctly fitted and not
obstructed
Ye
s
No
Replace electronic board
No
Ye
s
Are electrodes sparking at
the bur
ner?
Ye
s
Go to sheet E
No
Check electrodes and
electrode leads.
Replace as necessar
y.
Sheet D