F
ault
finding
10
Ins
tructions
for
ins
tallation
and
servicing
aquaPL
US
VUI
3
62
-7
43
Sheet B
Check operation of pump and fan
Turn off the main ON/OFF control to the
"0" position
Disconnect the power supply to the boiler
Go to sheet A
Is there a display on the LCD panel?
Check transformer 230 VAC primary
(black/red) and approx. 17 VDC secondary
(blue/brown)
Check/replace pump
Replace fuse F1
If fan commences operation, exchange
gas valve
After approx. 20 secs.
Does fuse F1 blow?
Produce central heating demand.
Does fuse blow immediately?
Turn the main ON/OFF control to the "1"
position
Is t here a display on the LCD panel?
Yes
No
No
No
Yes
Check/replace fan
Replace electronic board
No
Yes
Yes
834702_33GB_012005.qxd 09.03.2005 16:26 Uhr Seite 43
