Technical data

45
Does green power `on` indicator ( ) glow or flash?
Does green power `on` indicator ( ) flash?
Go to sheet C.
Ensure boiler main on/off control is set to position ` `.
Is 230 V present across terminals L and N?
Reset overheat cut-off device by pressing on the middle of the transparent rubber cover. Does the green indicator flash now?
Check electrical supply and appliance fuses
Sheet A
Check and if necessary replace 2 A fuses situated below boiler terminal strip (spare fuse supplied with appliance). If fuse is defective, suspect wiring fault on external controls (see note 1).
Does green power `on` indicator glow now?
Go to sheet B.
Go to sheet C.
Check continuity of overheat thermostat, replace if necessary. Does the green indicator flash now? Check transformer (A, fig. 67) 230 V AC primary (black/ red) and approx. 17 V secondary (blue/brown) Does the indicator flash now?
Replace electronic boards.
Repair external wiring fault.
Yes
No
No No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Note 1 For test purposes, disconnect external controls from terminals 3 - 4 and replace with a bridge between these terminals. If appliance then operates, the fault is with the external controls.
No