Italtherm CITY BASIC - Boiler Block Alarm Codes and Solutions

31
Signal Probable causes 
02
the boiler has over-
heated and the
Safety Thermostat
has triggered
Turn the knob
on the unlock posion unl the red lamp
turns o (or eventually for a longer period to make the boiler cool),
then then bring the knob in the previous posion. If necessary, wait
and try again for few mes. If the lockout persists or reappears, call
the Service Centre.
Verify the safety thermostat funconality. Detect the causes of
the overheang, e.g. an insucient circulaon in the primary cir-
cuit; max gas pressure out of the limits or maximum heang power
excessive for the heang system size.
03
Incorrect ue ow
(even momentary)
Restore the boiler funcon by turning the knob
on the unlock
posion
, wait the red light to turn o, then bring the knob
in the previous posion. If the lockout persists or reappears, call the
Service Centre.
check the eciency of the ue ducts and of the ue ow detec-
on device.
Insucient air sup-
ply / room venla-
on
Check that the outlet which communicates with the outdoor, com-
pulsory according to the regulaon in force, is not obstructed by
pieces of furniture against the wall or by other objects. It is however
normal that the outlet is realized behind a radiator. The outlet must
be of the dimension prescribed by the law and must be cleaned
inside: some types have an an-insects net which could have been
dired by dust or by spider webs. Call a Qualied Technician when
it is necessary.
Interferences with
air supply / room
venlaon
If in the room where the boiler is installed there are replaces,
stoves, coal stoves or similar, fans for the air outlet, such as wall
fans, aspiring cowls for cooking boards with outlet pipe, let the
technician check that the inlet is correctly OVERSIZED or that there
are the ADDITIONAL inlets as prescribed by the laws in force, be-
cause, otherwise, these devices interfere with the evacuaon of the
boiler ue.
– 5
Communicaon be-
tween display and
main PCB is not cor-
rect
At every Power On, this alarm is showed for max 2-3 seconds; then
it will disappear. If not, call the Service.
Check display, main PCB and connecon wire. Replace what it is
needed.
05
Failure to the sys-
tem ow tempera-
ture probe.
Check the cabling of the system ow temperature probe.
Replacement of the system ow temperature probe.
06
Failure to the DHW
temperature probe.
Check the cabling of the DHW temperature probe.
Replacement of the DHW temperature probe.