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DOMIcompact F 30 D
3.4 Troubleshooting
Fault Diagnosis
The boiler is equipped with an advanced self-diagnosis system. In the event of a fault within the boiler,
the display will show the relevant code.
There are faults that cause shutdown (faults from F1 to F3): in order to restore operation it requires the
operator to press RESET for 1 second (ref. 2 - Fig. 1) if the boiler fails to start, it will be necessary to
resolve the fault indicated on the display.
Other faults (from F5 to F37) cause temporary shutdowns that are automatically reset as soon as the
value comes back within the boiler’s normal working range.
No gas
Detection or ignition
electrode fault
Defective gas valve
Ignition power too low
Safety thermostat trips
Heating sensor damaged
No water circulation in
the system
Air in the system
Air pressure switch
(fails to close the contacts
within 60 sec. of turning
on the fan)
Air pressure switch
contact open
Incorrect wiring to the
air pressure switch
Wrong restrictor
Flue not correctly sized
or obstructed
Fault
No burner ignition
Possible cause
Low system pressure
System empty
Low water pressure switch
not connected or damaged
Cure
Flame present with
burner off signal
Electrode fault
PCB trouble
Sensor fault
Sensor damaged
Wiring shorted
Wiring broken
Hot water sensor fault
Sensor damaged
Wiring shorted
Wiring broken
Check the regular gas flow to the
boiler and the air has been eliminated
from the pipes.
Check the wiring of the electrode
and that it is correctly positioned and
free of any deposits
Check the gas valve
Adjust the ignition power
Check the correct positioning and
operation of the heating sensor
Check the pump
Vent the system
Check the wiring
Check the fan
Check the pressure switch
Change the restrictor
Check the wiring or change
the sensor
Fill the system
Check the sensor
Check the wiring or change
the sensor
Display code
F1
F3
F2
F5
F37
F7
F9
Check the ionizing electrode wiring
Check the PCB
Summary of Contents for DOMIcompact F 30 D
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