Check Operation Of Pump And Fan - Vaillant aquaPLUS VUI 362-7 Instructions For Installation And Servicing

Turn off the main ON/OFF control to the
"0" position
Disconnect the power supply to the boiler
Replace fuse F1
Turn the main ON/OFF control to the "1"
position
Is t here a display on the LCD panel?
Yes
Produce central heating demand.
Yes
Does fuse blow immediately?
No
After approx. 20 secs.
Yes
Does fuse F1 blow?
No
If fan commences operation, exchange
gas valve

Check operation of pump and fan

Check transformer 230 VAC primary
No (black/red) and approx. 17 VDC secondary
Check/replace pump
Is there a display on the LCD panel?
Check/replace fan
(blue/brown)
Yes
No
Replace electronic board
Sheet B
Go to sheet A