46
Is 230 V present across
boiler ter
minals 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 transfor
mer plug
(spare fuse provided with the
appliance). Does green
indicator glow now?
Check main on/of
f control, overheat ther
mostat and anti-surge fuse
Sheet B
Check transfor
mer (A, fig. 67)
230 V AC primar
y (black/
red) and approx. 17 V
secondar
y (blue/brown)
Does the indicator glow now?
Replace electronic boards.
Ye
s
Ye
s
Ye
s
No
No
No
No
Ye
s