Green Heating Technology
48
Signal
Probable causes
Suggested solutions
E24
Floor heating sys
-
tem safety thermo-
stat triggering:
system flow tem
-
perature too high;
floor heating sys
-
tem
defective,
faulty or malfunc-
tioning.
The floor heating system and the floor cladding can be damaged by
temperature shocks, so a good quality system includes one or more
safety thermostats that, if necessary, trigger and lock the boiler.
Try a boiler reset by using the
button (eventually wait for a
period that allows to cool the system and restore the thermostat). If
the lockout persists or reappears, call the Service Centre
Remark:
when this alarm is active, the hot water production is locked too.
If any floor heating system was installed, check the integrity of
the jumper connecting terminals 57 and 58 of M12 see "Electrical
diagram" on page 56).
If the floor heating system is installed
, check the system flow tem
-
peratures on the boiler and on the low temperature system kits
(if installed). Replace the faulty or out-of-tolerance thermostats.
Check the correct positioning of the thermostats on the system (see
"Floor heating system" on page 20).
E31
Communication er
-
ror between the Re-
mote Control (if pre-
sent) and the boiler
User:
select the
Summer
mode using the button
.
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).
E33
E34
Cabling configura
-
tion error.
User:
Try a boiler reset by using the
button. If the lockout
persists or reappears, call the Service Centre.
Refer to the electric diagram (page 56) and check the integrity of the
wirings, especially the eventual short cable jumpers between two
contacts of the same connector (on the cabling connections to the
electronic board).
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).
