53
10 FAULT-FINDING
10.1 General (all installations)
Check the following, in sequence (by service engineer):
Step
Signs
Check points
Actions
1
Boiler display is blank. The mains voltage 230 V Replace fuse if
necessary, but check
what circuit it was
protecting and rectify if
faulty.
The fuse in the euro-
connector
The control box fuses
2
Boiler display shows a
fault code
For flashing digits
If yes, follow instructions
in the table,
ref. Par. 10.2
.
3
Boiler display shows
operating code
(see Par. 6.3)
0
(no heat demand)
Go to point 4.
1
to
9
,
h
,
l
,
b
try to find the cause of
the fault, using operating
mode shown.
4
Use boiler manual
override.
(see Par. 6.1.3)
Does the boiler start up?
Yes, check external
control and wiring, or go
to point 6.
No, go to point 5.
5
Override external
controls by fitting a
link across terminals
3 and 4 of the boiler
terminal strip
Does the boiler start up?
Yes, check boiler
parameters. If all OK,
then replace control box.
No, repeat point 3,or go
to point 6.
