Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 45)

Fault finding 10

Instructions for installation and servicing aquaPLUS VUI 362-7 45

Does fan run after approx. 30 secs.?

Check flue and ignition system

Check diagnostic code D.24

(see page 39) equal 1?

Check pitot tube (in fan outlet) and air

hoses are not obstructed and correctly

aligned.

Check or replace air pressure switch.

837/637 Check 4 pin connector for

fan speed control.

Does the fan run now?

Is 230 VAC present across fan

terminals?

Replace electronic board

Yes

Yes Check/replace fan

Does the boiler

commence ignition

Check status code

(see page 38) is S.33?

Check air/flue gas system

is correctly fitted and not

obstructed

Yes

Replace electronic board

Yes

Are electrodes sparking at

the burner?

Yes Go to sheet E

Check electrodes and

electrode leads.

Replace as necessary.

Sheet D

Check flue restrictor

correspond to flue length

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Vaillant aquaPLUS VUI 362-7 Service Manual Page 45