82
Check gas valve and central heating system pressure
Does bur
ner light 1st
attempt?
Does bur
ner light within 3
ignition attempts?
No
Ye
s
Check gas supply
Does bur
ner light?
Ye
s
Check bur
ner pressure
settings are correct
Ye
s
No
Reset boiler
No
Check/replace gas valve
as necessar
y
Does bur
ner light?
No
Replace electronic board
Ye
s
Is bur
ner indicator
illuminated?
No
Check flame
rectification lead and
electrode
Is bur
ner indicator
illuminated
No
Ye
s
Does bur
ner shut down after
approx. 15 secs.
No
Go to sheet F
Ye
s
Does status code (see page 52)
show S. 53?
Check water pressure in
central heating system, refill
and vent. as necessar
y
Check pump is running?
Ye
s
Ye
s
Replace pump
No
Is 230 V
AC present at the
pump plug connection?
No
Replace electronic board
Sheet E
FAULT FINDING