Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 43)

Fault finding 10

Instructions for installation and servicing aquaPLUS VUI 362-7 43

Sheet BCheck 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

Check/replace fan Replace electronic board

Yes

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Vaillant aquaPLUS VUI 362-7 Service Manual Page 43