10
F
ault
finding
Ins
tructions
for
ins
tallation
and
servicing
aquaPL
US
VUI
3
62
-7
46
Check gas valve and central heating system pressure
Does burner light 1st
attempt?
Does burner light within 3
ignition attempts?
No
Yes
Check gas supply
Does burner light?
Yes
Check burner pressure
settings are correct
Yes
No
Reset boiler
No
Check/replace gas valve
as necessary
Does burner light?
No
Replace electronic board
Yes
Is burner indicator
illuminated?
No
Check flame
rectification lead and
electrode
Is burner indicator
illuminated
No
Yes
Does burner shut down after
approx. 15 secs.
No
Go to sheet F
Yes
Does status code (see page 38)
show S. 53?
Check water pressure in
central heating system, refill
and vent. as necessary
Check pump is running?
Yes
Yes
Replace pump
No
Is 230 VAC present at the
pump plug connection?
No
Replace electronic board
Sheet E
834702_33GB_012005.qxd 09.03.2005 16:26 Uhr Seite 46
