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INSTALLERUSER
MAINTENANCE TECHNICIAN
3.10 TROUBLESHOOTING.
Maintenance interventions must be carried out by an
authorised company (for example contact the Author-
ised Technical Service Centre).
- Smell of gas. Caused by leakage from gas circuit pipelines. Check
sealing eciency of gas intake circuit.
- Repeated ignition blocks. No gas, check the presence of pressure
in the network and that the gas adduction valve is open. Incorrect
adjustment of the gas valve, check the correct calibration of the
gas valve.
- Irregular combustion or noisiness. It may be caused by: a dirty
burner, incorrect combustion parameters, intake-exhaust ter-
minal not correctly installed. Clean the above components and
ensure correct installation of the terminal, check correct setting
of the gas valve (O-Set setting) and correct percentage of CO
2
in ue gases.
- e over temperature safety thermostat, the ow probe or the
return probe are triggered frequently. It can depend on the lack
of water in the boiler, little water circulation in the system or
blocked pump. Check on the manometer that the system pressure
is within established limits. Check that the radiator valves are
not closed and also the functionality of the pump.
In addition:
- check that the exchanger safety thermostat has not intervened. If
it has, check the integrity of the module and ceramic bre panel,
replace the cover gasket of the manifold and reset the thermostat
by pressing the specic button.
- check that the exchanger safety thermostat has not intervened. If
it has, check the integrity of the module and ceramic bre panel,
replace the cover gasket of the manifold and reset the thermostat
by pressing the specic button
Also check the integrity of the thermofuse, and if it has been trig-
gered it will be necessary to check the integrity of the module
and the ue circuit.
- Drain trap clogged. is may be caused by dirt or combustion
products deposited inside. Check, by means of the condensate
drain cap, that there are no residues of material blocking the ow
of condensate.
- Heat exchanger clogged. is may be caused by the trap being
blocked. Check, by means of the condensate drain cap, that there
are no residues of material blocking the ow of condensate.
- Noise due to air in the system. Check opening of the special air
vent valve cap (Fig. 26 Ref. 27). Check that system lling and air
bleeding has been performed according to the requirements.
- Noise due to air inside the condensation module. Use the manual
air vent valve (Fig. 26 Ref. 20) to eliminate any air present in the
condensation module. When the operation has been performed,
close the manual vent valve.
- No DHW is produced. e boiler is equipped with a function
that automatically recognises when there is an optional DHW
probe, and an anomaly is reported if there is a failure aecting
the DHW NTC probe. If there is a power outage, or if the boiler
is switched o and back on again during the failure, it will not be
possible to detect said failure, but it will, however, be recorded
in the errors anomaly records.
In case of ΔT > 35 °C, the boiler lowers the power to avoid sur-
passing that value. When this status is on, the ow temperature
symbol ashes.
3.11 CONTROL FUNCTION AIR FLOW RATE.
With ignition request, before the start of the fan, the condition of
the pressure switch contact is veried. If this is detected closed,
the continuation of the cycle is prevented.
Aer a delay time of about 50 seconds, there is a permanent block
and fault “0A4” is signalled.
If the detected contact is open, the fan activates at the “air pressure
switch control” speed (3300 rpm). When the pressure switch is
closed, the fan switches to the ignition speed, and the ignition
cycle continues ignoring the pressure switch condition.
If during operation at the “air pressure switch control” speed (3300
rpm) the pressure switch does not close, aer a time of about 50
seconds there is a permanent block and the fault “0A4” is signalled.
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