Dunkirk DWB Series - Manual (Page 37)

37
13 - TROUBLE SHOOTING
Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault, the display will fl ash indicating the
fault code.
There are faults that cause permanent shutdown (marked with the letter “A”): to restore operation just press the RESET
button (detail 6 - Section 10.4, Control, page 25) for 1 second or RESET on the optional remote timer control if installed;
if the boiler fails to start, it is necessary to fi rst eliminate the fault.
Other 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
- List of faults
Fault
code
Fault Possible cause Cure
A01 No burner ignition
No gas
Check the regular gas fl ow to the boiler and that the air has
been eliminated from the pipes
Ignition/detection electrode fault
Check the wiring of the electrode and that it is correctly
positioned and free of any deposits
Faulty gas valve Check the gas valve and replace it is necessary
Ignition power too low Adjust the ignition power
A02
Flame present signal with burner
off Electrode fault Check the ionisation electrode wiring
Card fault Check the card
A03
Overtemperature protection
activation
Heating sensor damaged Check correct heating sensor positioning and operation
No water circulation in the system Check the circulating pump
Air in the system Vent the system
F05
The air pressure transducer does
not receive a suffi cient minimum
value within 25 seconds Incorrect air pressure transducer wiring Check the wiring
Flue not correctly sized or obstructed Check the length of fl ue and that it is clean
A06 No fl ame after the ignition stage
Low pressure in the gas system Check the gas pressure
Burner minimum pressure setting Check the pressures
F10 Delivery sensor 1 fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected
F11 DHW sensor fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected
F14 Delivery sensor 2 fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected
A15 Air signal protection activation
Fault F05 generated 5 times in the last
15 minutes
See fault F05
F34 Supply voltage under 170V. Electric mains trouble Check the electrical system
F35 Faulty mains frequency Electric mains trouble Check the electrical system
F37 Incorrect system water pressure
Pressure too low Fill the system
Sensor damaged Check the sensor
F39 External probe fault
Probe damaged or wiring short circuit Check the wiring or replace the sensor
Probe disconnected after activating the
sliding temperature Reconnect the external probe or disable the sliding
temperature
A41 Sensor positioning Delivery sensor detached from the pipe Check correct heating sensor positioning and operation
F42 Heating sensor fault Sensor damaged Replace the sensor
F43 Exchanger protection activation.
No system H
2
O circulation Check the circulating pump
Air in the system Vent the system
A44
DHW sensor disconnected Sensor disconnected
Check the correct positioning and operation of the DHW
sensor.
A48 Air signal protection activation Fault F05 for 150 seconds See Fault F05
F50 Modulation regulator fault Wiring disconnected Check the wiring
F51 Low water cutoff warning
Pressure too low Fill the system
Low water cutoff damaged Check the contact