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Faulty primary circuit
(no water or absence of flow)
Faulty fan control system
Faulty c.h. temp. probe NTC
Faulty external temp. probe
NTC
Faulty flue temp. probe NTC
Flue probe intervention lock-
out
Flame detection error
No circulation, of faulty pump
or intervention primary tem-
perature limit.
3.9
Flue probe
The flue probe 15 and safety thermal fuse
20 indicated in Fig. 3.7 are a safety device.
The flue probe 15 intervenes when the flue
temperature exceeds 110°C placing the
boiler in safety block switching it off.
To reset normal boiler functioning, just press
the 11 (Fig. 3.5) key.
If flue probe 15 does not intervene and,
therefore does not send the boiler into se-
curity lockout, thermofusible 20 enters into
function as a further safety measure.
This component sends the boiler into se-
curity lockout when the flue temperature
reaches 167°C.
To restore the normal operation of the boil-
er, contact the Authorized Service Centre.
- 18 -
USEFUL ADVICE
04E
05E
06E
08E
09E
10E
11E
Fig. 3.7
14E
15
20
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