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DIVA HF
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.
Table of faults
Table. 8 - List of faults
Fault
Fault
code
A01
No burner ignition
Flame present signal with
A02
burner off
Overtemperature protection
A03
intervention
F04
Card parameter fault
Air pressure switch (fails to
F05
close contacts within 20 sec.
of fan activation)
No flame after the ignition
A06
phase
Air pressure switch (contacts
F07
closed on activation of fan)
A09
Gas valve fault
F10
Delivery sensor fault
F11
DHW sensor fault
A16
Gas valve fault
A23
Card parameter fault
A24
Card parameter fault
F34
Supply voltage under 140VAC
F35
Faulty mains frequency
Incorrect system water pres-
F37
sure
All manuals and user guides at all-guides.com
Possible cause
Cure
Check the regular gas flow to the
No gas
boiler and that the air has been elim-
inated from the pipes
Check the wiring of the electrode
Ignition/detection
and that it is correctly positioned and
electrode fault
free of any deposits
Check the gas valve and replace it if
Faulty gas valve
necessary
Ignition power too
Adjust the ignition power
low
Check the ionisation electrode wir-
Electrode fault
ing
Card fault
Check the card
Heating sensor
Check the correct positioning and
damaged
operation of the heating sensor
No water circulation
Check the circulating pump
in the system
Air in the system
Vent the system
Safety thermostat
Check safety thermostat operation
intervention
Wrong card parame-
Check the card parameter and mod-
ter setting
ify it if necessary
Air pressure switch
Check the pressure switch / Fan /
contact open
Fan socket
Faulty air pressure
Check the wiring
switch wiring
Wrong baffle
Make sure the baffle is correct
Flue obstructed or
Check the length of the flues / Clean
not correctly sized
the flues
Low pressure in the
Check the gas pressure
gas system
Burner minimum
Check the gas pressures
pressure setting
Air pressure switch
Check the pressure switch / Fan /
contact open
Fan socket
Faulty air pressure
Check the wiring
switch wiring
Wrong baffle
Make sure the baffle is correct
Flue obstructed or
Check the length of the flues / Clean
not correctly sized
the flues
Wiring disconnected Check the wiring
Check the gas valve and replace it if
Faulty gas valve
necessary
Sensor damaged
Check the wiring or replace the sen-
Wiring shorted
sor
Wiring disconnected
Sensor damaged
Check the wiring or replace the sen-
Wiring shorted
sor
Wiring disconnected
Wiring disconnected Check the wiring
Check the gas valve and replace it if
Faulty gas valve
necessary
Wrong card parame-
Check the card parameter and mod-
ter setting
ify it if necessary
Wrong card parame-
Check the card parameter and mod-
ter setting
ify it if necessary
Electric mains trou-
Check the electrical system
ble
Electric mains trou-
Check the electrical system
ble
Pressure too low
Fill the system
Water pressure
switch damaged or
Check the sensor
not connected
cod. 3541E613 - Rev. 00 - 02/2016
Fault
Fault
Possible cause
code
No system H
Exchanger protection inter-
F43
culation
vention.
Air in the system
Controller DBM32
F50
Controller DBM32 fault
internal error
Controller DBM32
F51
Controller DBM32 fault
internal error
Cure
O cir-
2
Check the circulating pump
Vent the system
Check the earth connection and
replace the controller if necessary.
Check the earth connection and
replace the controller if necessary.
EN
19
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