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
53). Is heating demand present?
No
Is 230 VAC present across terminals 4 and 5
No
External fault: Check all external controls are
calling for heat, replace or repair as necessary
(see also note 1 sheet A)
Yes
Yes
Does failure code show on LCD display?
Disconnect built in timer (if fitted)
No Go to sheet D
Does ignition
commence?
No
Yes
Replace defective
timer
Sheet C
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