- 9 -
FAULT FINDING
4 FAULT FINDING
FAUL
T FINDING
Components to check
Section of the manual
(note ref. in brackets)
– (1)
– (2)
– (3)
14.1
– (4)
5
–
6.5
7
8.4
9.2
10
11.4
12.2
12.2
13.1
– (7)
–
–
–
–
Appliance lock–out (*)
Defect
Power supply line
Gas supply line
Flue pipes
Cond. drain pipe and trap
C.H. circuit
Condensing heat exchanger
External pump
Fuses (Electronic p.c.b.)
Main electronic p.c.b.
Boiler settings
Control panel electr. p.c.b.
Gas valve
C.H. flow
temp.
probe
C.H. return temp. probe
Fan / air restrictor
Ignition electrode
Detection electrode
Safety thermostat
Gas restrictor
Flue temp. probe NTC
Expansion vessel external
Safety valve external
Pressure gauge external
External temp. probe
Room themostat delayed
Display indicates ”Er”
Er 01
+
A
B
D
C
Er 02
+
C
B
Er 03
+
A
Er 04
+
B
A
Er 05
+
A
Er 06
+
A
A
Er 08
+
A
Er 09
+
A
B
Er 10
+
A
B
A
C
B
Er 14
+
A
C
B
Er 15
+
A
C
B
Er 16
+
A
A
Er 17
+
A
A
Er 18
+
B
D
C
A
L3
B
D
C
A
A
TD
B
B
A
The letter in the cells indicates the possible fault cause.
A
. . . . .
Z
indicates the most probably (
A
) to less probably (
. . . .
Z
)
