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Signalling
-In the work stage the boiler detects a
AL 8
pressure below the vacuum switch
NO NEG
setting threshold.
PRESS
-The system is stopped.
AL 9
-Appears when the combustion air
INSUFF
flow is below a certain threshold.
DRAUGHT
-Occurs when the water pressure does
AL E
not come within the values for
WATER
correct operation.
PRESSURE
-The system is stopped.
-Occurs in case of cutting in heating
AL A
chamber water temperature safety
thermostat.
SAFETY H2O
-The system is stopped.
-Occurs when the gearmotor works
AL B
continuously and for more than 60
AUG TRIAC
sec.
ERROR
-The system is stopped.
-Occurs in case of water T detection
Al C
probe
WATER PROBE
fault,
displaying T H2O = 0 °C.
S1
- The shutdown procedure
is activated.
AL F
-Occurs when the water temperature
HOT
has exceeded the fixed limits.
-The system is stopped.
WATER S1
-Occurs in case of water T detection
Al G
probe
WATER PROBE
fault,
displaying T H2O = 0 °C.
S2
-The shutdown procedure is activated.
AL I
-Occurs when the water temperature
HOT
has exceeded the fixed limits.
-The system is stopped.
WATER S2
-Occurs in case of water T detection
probe
Al H
fault,
WATER PROBE
displaying T H2O = 0 °C.
S3
- The shutdown procedure
is activated.
AL d
-Occurs when the water temperature
HOT
has exceeded the fixed limits.
-The system is stopped.
WATER S3
AWAITING
-Occurs on relighting the boiler
COOL
immediately after having shut it down.
AIRFLOW
-Occurs when the air flow meter is
METER
disconnected.
FAILURE
-Occurs when the water temperature
FROST RISK
falls below a certain value.
-Occurs when the boiler has
SERVICE
exceeded 1800 hours of operation
DUE
since the previous servicing.
The Manufacturer reserves the right to make technical or aesthetic changes to the products at any time without notice.
The drawings, measurements, diagrams and any other configurations are given only by way of example.
Fault
-The combustion chamber is dirty.
-The fume duct is obstructed.
-The fire door is not closed.
-The overpressure valves are open-
stuck.
-Faulty vacuum switch.
-The combustion chamber is dirty.
-The fume duct is obstructed.
-The fire door is not closed.
-The overpressure valves are open-
stuck.
-Faulty air flow meter.
-Occurs when the pressure transducer
on the water circuit detects a pressure
below or above the fixed limits.
-The safety thermostat has detected a
temperature
threshold due to overheating of the
heating
gearmotor operation.
-The
gearmotor control relay (contacts
stuck).
-Faulty probe
-The probe is disconnected from the
board.
-Occurs when the temperature probe
in the heating chamber detects a
value above 92°C.
-Faulty probe
-The probe is disconnected from the
board.
-Occurs when the temperature probe
in the heating chamber detects a
value above 92°C.
-Faulty probe
-The probe is disconnected from the
board.
-Occurs when the temperature probe
in the heating chamber detects a
value above 92°C.
-Reset attempt in shutdown stage with
boiler hot in cooling stage.
-The controller does not detect the
amount of combustion air and does
not shut down the boiler; it only
excludes the air flow meter functions.
-The boiler controller detects the
water temperature below 6°C and
displays a message.
-Extraordinary maintenance notice.
69
Possible causes
above
the
setting
chamber
water
blocking
controller
detects
a
faulty
Cures
-Check cleanness of the fume duct
and combustion chamber.
-Check hermetic closing of the door.
-Check closing of the overpressure
valves.
-Other reinstatement operations must
be carried out by a service centre.
-Check cleanness of the fume duct
and combustion chamber.
-Check hermetic closing of the door.
-Check closing of the overpressure
valves.
-Other reinstatement operations must
be carried out by a service centre.
-Check the cause of the problem,
restoring the circuit pressure by
bringing it to the normal operating
value.
-Check the cause of excessive
overheating.
-Reset the relevant safety thermostat
by pressing the reset button.
-Reinstatement operations must be
carried out by a service centre.
-Reinstatement operations must be
carried out by a service centre.
-Check the cause of the problem,
restoring the temperature by bringing
it to the normal operating value.
-Reinstatement operations must be
carried out by a service centre.
-Check the cause of the problem,
restoring the temperature by bringing
it to the normal operating value.
-Reinstatement operations must be
carried out by a service centre.
-Check the cause of the problem,
restoring the temperature by bringing
it to the normal operating value.
-Alarm reset is possible only after
shutdown.
-Reinstatement operations must be
carried out by a service centre.
-The pump starts in order to move the
water inside the heating circuit.
- Monitor the water temperature so
that it does not fall below 0°C.
- Cleaning - extraordinary
maintenance and reinstatement
operations must be carried out by an
authorised service centre.
DOMUSFIRE C29-C35-C39 HR
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