Periodical Check; List Of Faults; Specifications; Troubleshooting - Ferroli DOMItech F 24 - 32 D Instructions For Use Manual

4.3 Maintenance

Periodical check

To ensure correct operation of the unit over time, have qualified personnel carry out a
yearly check, providing for the following:
• The control and safety devices (gas valve, flow meter, thermostats, etc.) must func-
tion correctly.
• The fume exhaust circuit must be perfectly efficient.
(Sealed chamber boiler: fan, pressure switch, etc. -The sealed chamber must be
tight: seals, cable glands, etc.)
(Open chamber boiler: anti-backflow device, fume thermostat, etc.)
• The air-fume end piece and ducts must be free of obstructions and leaks
• The burner and exchanger must be clean and free of deposits. For possible cleaning
do not use chemical products or wire brushes.
• The electrode must be properly positioned and free of scale.
= =
fig. 17 - Electrode positioning
• The gas and water systems must be airtight.
• The water pressure in the cold water system must be about 1 bar; otherwise, bring
it to that value.
• The circulating pump must not be blocked.
• The expansion tank must be filled.
• The gas flow and pressure must correspond to that given in the respective tables.

4.4 Troubleshooting

Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault,
the display will flash together with the fault symbol (detail 11 - fig. 1) indicating the fault
code.
There are faults that cause permanent shutdown (marked with the letter "A"): to restore
operation, press the RESET button (detail 6 - fig. 1) for 1 second or RESET on the op-
tional remote timer control if installed; if the boiler fails to start, it is necessary to eliminate
the fault.
Faults marked with the letter "F" cause temporary shutdowns that are automatically reset
as soon as the value returns within the boiler's normal working range.

List of faults

Table. 8
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
36
EN
Cure
5. TECHNICAL DATA AND CHARACTERISTICS
Check the regular gas flow to the
boiler and that the air has been elimi-
Table. 9 - Key of figures cap. 5
nated from the pipes
5 Sealed chamber
Check the wiring of the electrode and
that it is correctly positioned and free
7 Gas inlet
of any deposits
8 Domestic hot water outlet
Check the gas valve and replace it if
9 Cold water inlet
necessary
10 System delivery
Check the wiring
11 System return
Adjust the ignition power
14 Safety valve
Check the ionisation electrode wiring
16 Fan
Check the card
19 Combustion chamber
Check the correct positioning and
22 Burner
operation of the heating sensor
27 Copper exchanger for heating and hot water
28 Fume manifold
Vent the system
29 Fume outlet manifold
Check the card parameter and modify
it if necessary
32 Heating circulating pump
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
cod. 3540Z940 - 06/2012 (Rev. 00)
DOMItech F 24 - 32 D
Code
Fault Possible cause
fault
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 O system circulation
2
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 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
Check the circulating pump
Vent the system
Check the wiring
Check the gas valve and replace it if
necessary
Check the flue
36 Automatic air vent
38 Flowswitch
42 DHW temperature sensor
44 Gas valve
56 Expansion tank
72 Room thermostat (not supplied)
74 System filling cock
81 Ignition and detection electrode
114 Water pressure switch
138 External probe (not supplied)
139 Room unit (not supplied)
187 Fume baffle
340 Bypass pipe
278 Double sensor (Safety + Heating)