Vaillant aquaPLUS VUI 362-7 Service Manual download pdf (Page 44)

10 Fault finding

Instructions for installation and servicing aquaPLUS VUI 362-744

Check central heating and controls

Ensure that radiator temperature control knob

is set to vertical position and that any internal

timer (if fitted) is calling for heat

Check diagnostic code D.08 (see page

39). Is heating demand present?

Is 230 VAC present across terminals 4 and 5

External fault: Check all external controls are

calling for heat, replace or repair as necessary

(see also note 1 sheet A)

Yes

Does failure code show on LCD display?

Disconnect built in timer (if fitted)

No Go to sheet D

Does ignition

commence?

Yes

Replace defective

timer

Sheet C

834702_33GB_012005.qxd 09.03.2005 16:26 Uhr Seite 44

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 59 60

No comments

Vaillant aquaPLUS VUI 362-7 Service Manual Page 44