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CLIZIA D LOW NOX 24 AS
List of faults
Table. 9
Code
Fault
Possible cause
fault
No gas
Ignition/detection electrode fault
A01
No burner ignition
Faulty gas valve
Gas valve wiring disconnected
Ignition power too low
Electrode fault
Flame present signal with
A02
burner off
Card fault
Heating sensor damaged
Overtemperature protec-
A03
tion activation
No water circulation in the system Check the circulating pump
Air in the system
F04
Card parameter fault
Wrong card parameter setting
Card parameter fault
Wrong card parameter setting
Wiring disconnected
F05
Fan fault
Defective fan
Card fault
Low pressure in the gas system
No flame after the ignition
A06
phase
Burner minimum pressure setting Check the pressures
F07
Card parameter fault
Wrong card parameter setting
Wiring disconnected
A09
Gas valve fault
Faulty gas valve
Sensor damaged
F10
Delivery sensor 1 fault
Wiring shorted
Wiring disconnected
Sensor damaged
F11
DHW sensor fault
Wiring shorted
Wiring disconnected
Sensor damaged
F14
Delivery sensor 2 fault
Wiring shorted
Wiring disconnected
Wiring disconnected
A16
Gas valve fault
Faulty gas valve
Fan fault
Faulty baffle
F20
Combustion control fault
Flue not correctly sized or
obstructed
Fault F20 generated 6 times in the
A21
Poor combustion fault
last 10 minutes
A23
Card parameter fault
Wrong card parameter setting
A24
Card parameter fault
Wrong card parameter setting
F34
Supply voltage under 180V. Electric mains trouble
F35
Faulty mains frequency
Electric mains trouble
Pressure too low
Incorrect system water
F37
Water pressure switch damaged
pressure
or not connected
Probe damaged or wiring shorted
F39
External probe fault
Probe disconnected after activat-
ing the sliding temperature
Delivery sensor or DHW sensor
A41
Sensor positioning
detached from the pipe
F42
Heating sensor fault
Sensor damaged
No H
F43
Exchanger protection trips.
Air in the system
Modulating Operator wiring dis-
connected
F50
Gas valve fault
Faulty gas valve
A51
Poor combustion fault
Inlet/exhaust flue obstruction
Cure
Check the regular gas flow to the
boiler and that the air has been elimi-
nated from the pipes
Check the wiring of the electrode and
that it is correctly positioned and free
of any deposits
Check the gas valve and replace it if
necessary
Check the wiring
Adjust the ignition power
Check the ionisation electrode wiring
Check the card
Check the correct positioning and
operation of the heating sensor
Vent the system
Check the card parameter and modify
it if necessary
Check the card parameter and modify
it if necessary
Check the wiring
Check the fan
Check the card
Check the gas pressure
Check the card parameter and modify
it if necessary
Check the wiring
Check the gas valve and replace it if
necessary
Check the wiring or replace the sen-
sor
Check the wiring or replace the sen-
sor
Check the wiring or replace the sen-
sor
Check the wiring
Check the gas valve and replace it if
necessary
Check the fan and fan wiring
Check the baffle and replace it if nec-
essary
Check the flue
See fault F20
Check the card parameter and modify
it if necessary
Check the card parameter and modify
it if necessary
Check the electrical system
Check the electrical system
Fill the system
Check the sensor
Check the wiring or replace the sen-
sor
Reconnect the external sensor or dis-
able the sliding temperature
Check the correct positioning and
operation of the sensors
Replace the sensor
O system circulation
Check the circulating pump
2
Vent the system
Check the wiring
Check the gas valve and replace it if
necessary
Check the flue
5. TECHNICAL DATA AND CHARACTERISTICS
Table. 10 - Key of figures cap. 10
5 Sealed chamber
7 Gas inlet
8 Domestic hot water outlet
9 Cold water inlet
10 System delivery
11 System return
14 Safety valve
16 Fan
19 Combustion chamber
22 Burner
27 Copper exchanger for heating and hot water
28 Fume manifold
29 Fume outlet manifold
32 Heating circulating pump
36 Automatic air vent
37 Cold water inlet filter
5.1 General view and main components
5
16
278
81
22
194
95
cod. 3541D120 - Rev. 00 - 10/2012
38 Flowswitch
39 Water flow limiter
42 DHW temperature sensor
44 Gas valve
56 Expansion tank
72 Room thermostat (not supplied)
74 System filling cock
81 Ignition and detection electrode
95 Diverter valve
114 Water pressure switch
138 External probe (not supplied)
139 Room unit (not supplied)
187 Fume baffle
194 DHW exchanger
241 Automatic bypass
278 Double sensor (Safety + Heating)
29
187
10
42
8
44
7
39
9
38
37
fig. 21 - General view
28
56
27
19
14
36
114
74
11
32
19
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