Green Heating Technology
42
Signal
Probable causes
Suggested solutions
35
RED
YELLOW
Unexpected flame
the control elec
-
tronic has detected
the flame on the
burner when this
one should be off
Wait for the boiler automatic reset (5 minutes) or reset it manually
by turning the knob
on the unlock position
, waiting the
red light to turn off, then bringing the knob in the previous position.
If the lockout persists or reappears, call the Service Centre
Detect eventual malfunctioning of the gas valve (that does not
stop fully the gas flow, so the burner remains ignited) or of the elec-
tronics, flame detection section (that detects the flame presence
even if it's absent).
38
Failure to the out
-
door temperature
probe (optional).
The outdoor tem
-
perature probe,
that was recog
-
nized and working,
now results faulty.
User:
Call the Service Centre.
The boiler now works either in heating and in hot water, like as the external boiler had
never been installed, so the heating system temperature is set by the knob
, in direct
way and not as a function of the outdoor temperature. The alarm is displayed to in
-
form that the accessory is no more efficient (consider that, on a first analysis, the boiler
seems to work perfectly). Important: if the boiler is turned off and then on again, it's
possible** that the alarm is no more displayed, even though the problem persists.
Check the cabling of the outdoor temperature probe.
Replacement of the outdoor temperature probe.
** The alarm shows again only if the resistance of the probe is out of tolerance or in
short-circuit. On the contrary, if the probe or the relevant cabling is interrupted, when
the electrical supply is restored the boiler will consider the external probe absent and, in
Winter mode, it will work in normal mode (temperature shifting disabled).
39
Suspected freezing
After a power fail-
ure, the boiler de
-
tected tempera
-
tures at the Heating
and DHW probes
equal to, or less
than, 0°C when
power was restored
The display shows the alarm code 39 while the boiler inhibits the
ignition of the burner and activates the circulator, forcing water to
circulate in the hydraulic circuits.
If, during this time, the temperatures measured by the probes rise
above +1°C, the alarm is reset and the boiler returns to the normal
operation.
Otherwise, the alarm will persist and you should suspect that water
has frozen at one or more points of the hydraulic circuit of the boiler
and/or system (with possible damage to the frozen parts). If the
alarm persists, call a qualified technician.
Find/replace the parts damaged by the freezing.
42
RED
YELLOW
System error
Anomaly of inner
boiler device(s)
Mains electrical
power supply out
of tolerance limits
Detect the fault or anomaly also referring to the technical literature
reserved to the service centres.
