Technical data

47
Does yellow central heating demand indicator ( ) glow?
Does burner light?
Go to sheet H.
Check central heating control switch is set to the position ( ).
Check Central Heating control and external controls
Sheet C
If the central heating demand indicator ( ) still does not glow, replace electronic boards.
Yes
Yes
No
No
Go to sheet D.
Is 230 V AC present across boiler terminals 4 and 5?
External fault. Check whether all external controls are calling for heat, replace or repair as necessary (see also note 1, sheet A).
No
Yes
No