Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 46)

10 Fault finding

Instructions for installation and servicing aquaPLUS VUI 362-746

Check gas valve and central heating system pressure

Does burner light 1st

attempt?

Does burner light within 3

ignition attempts?

Yes

Check gas supply

Does burner light?

Yes

Check burner pressure

settings are correct

Yes

No Reset boiler

Check/replace gas valve

as necessary

Does burner light?

Replace electronic board

Yes

Is burner indicator

illuminated?

Check flame

rectification lead and

electrode

Is burner indicator

illuminated

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

Is 230 VAC present at the

pump plug connection?

Replace electronic board

Sheet E

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Vaillant aquaPLUS VUI 362-7 Service Manual Page 46

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