Green Heating Technology
44
Signal
Probable causes
Suggested solutions
E31
Remote control*
not working
Data exchanged between
the boiler and the Re
-
mote Control don't com-
ply with the expected
protocol.
* This applies to Remote
Control optional kit only,
and not to third parties
chrono-thermostats
User:
Disconnect the electrical supply to the boiler for at least 30
seconds, by operating the suitable external bipolar switch, then
connect it again and ensure that the
Summer
mode is selected by
using the button
. If the lockout persists or reappears, call the
Service Centre�
Problems on the optional Remote Control connection link (passing
close to supply cables or other electromagnetic field sources; con
-
nection failure; cable length over 50 meters).
E35
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 using the
button. 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).
E38
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 directly and not as a
function of the outdoor temperature. The alarm is displayed to inform that the acces
-
sory 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).
E39
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.
