Technical data

Is 230 V present across

boiler terminals 3 and 5?

Does green power `on`

indicator ( ) glow now?

Go to sheet C.

Boiler on/off control defective,

replace electronic boards.

Check, replace 1.25 A fuse

next to the transformer plug

(spare fuse provided with the

appliance). Does green

indicator glow now?

Check main on/off control, overheat thermostat and anti-surge fuse

Sheet B

Check transformer (A, fig. 67)

230 V AC primary (black/

red) and approx. 17 V

secondary (blue/brown)

Does the indicator glow now?

Replace electronic boards.

Yes