List Of Faults; Technical Data And Characteristics - Ferroli DIVAtech D HF24 Instructions D'utilisation, D'installation Et D'entretien

4.4 Troubleshooting
Diagnostics
The boiler has 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 shutdowns (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. At this point the display will show "d4" for about
30 seconds or "d5" for about 5 minutes which indicates the waiting time after which the
boiler will resume normal operation. if the boiler fails to restart, it is necessary to eliminate
the fault.
Other faults cause temporary shutdowns (marked with the letter "F") which are automat-
ically 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
F05 Wiring disconnected
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
10 EN
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

5. TECHNICAL DATA AND CHARACTERISTICS

Adjust the ignition power
Table. 9- Legend, fig. 27, fig. 28 and fig. 29
Check the ionisation electrode wiring
Check the card
5 Sealed chamber
Check the correct positioning and 10 System delivery - Ø 3/4"
operation of the heating sensor
11 System return - Ø 3/4"
14 Safety valve
Vent the system
16 Fan
19 Combustion chamber
Check the card parameter and modify
it if necessary
22 Burner
Check the card parameter and modify
27 Copper exchanger for heating and DHW
it if necessary
28 Fume manifold
Check the wiring
29 Fume outlet collar
Check the fan
32 Heating circulating pump
Check the card
36 Automatic air vent
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
cod. 3541P873 - Rev. 00 - 04/2021
Code
Fault Possible cause
fault
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
Sensor positioning
detached from the pipe
A41
Not increase the flow tem-
Failed complete burner ignition
perature
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
DIVAtech D HF
Cure
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
Increase parameter P1 up to a maxi-
mum of 19
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
44 Gas valve
56 Expansion vessel
74 System filling faucet
81 Ignition and detection electrode
95 Diverter valve
114 Water pressure switch
187 Fume baffle
209 Hot water tank delivery
210 Hot water tank return
241 Automatic bypass
278 Double sensor (Safety + heating)