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
ter
minals 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 necessar
y
replace 2 A fuses situated
below boiler ter
minal strip
(spare fuse supplied with
appliance).
If fuse is defective, suspect
wiring fault on exter
nal
controls (see note 1).
Does green power `on`
indicator glow now?
Go to sheet B.
Go to sheet C.
Check continuity of overheat
ther
mostat, replace if
necessar
y.
Does the green indicator
flash now?
Check transfor
mer (A, fig. 67)
230 V AC primar
y (black/
red) and approx. 17 V
secondar
y (blue/brown)
Does the indicator flash now?
Replace electronic boards.
Repair exter
nal
wiring fault.
Ye
s
No
No
No
No
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
No
No
Note 1
For test purposes, disconnect
exter
nal controls from ter
minals
3 - 4 and replace with a bridge
between these ter
minals. If
appliance then operates, the
fault is with the exter
nal controls.
No
