Periodical Check; Troubleshooting; List Of Faults; Diagnostics - Ferroli DOMIcondens HE 26 C Instructions For Use, Installation And Maintenance

DOMIcondens HE 26 C
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. 22 - 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. 7
Fault
Fault
code
A01 No burner ignition
Flame present signal with
A02
burner off
Overtemperature protection
A03
activation
F04 Fume thermostat fault
Fume pressure switch fault
(contact fails to close)
F05
Fan fault
No flame after the ignition
A06
phase
F07 Card parameter fault
A09 Gas valve fault
F10 Delivery sensor 1 fault
F11 DHW sensor fault
F14 Delivery sensor 2 fault
A16 Gas valve fault
F20 Combustion control fault
A21 Poor combustion fault
Set nominal system water
A23 pressure not reached within
4 minutes
A24 4 fillings within 24 hours
F34 Supply voltage under 180V. Electric mains trouble
F35 Faulty mains frequency
Incorrect system water pres-
F37
sure
F39 External probe fault
A41 Sensor positioning
F42 Heating sensor fault
Exchanger protection activa-
F43
tion.
F50 Gas valve fault
A51 Poor combustion fault
cod. 3540Z852 - Rev. 01 - 08/2012
Possible cause Cure
Excessive condensate level Empty / clean the trap
Check the regular gas flow to the boiler
No gas and that the air has been eliminated
from the pipes
Check the wiring of the electrode and
Ignition/detection electrode fault that it is correctly positioned and free
of any deposits
Check the gas valve and replace it if
Faulty gas valve
necessary
Gas valve wiring disconnected Check the wiring
Ignition power too low Adjust the ignition power
Electrode fault Check the ionisation electrode wiring
Card fault Check the card
Check the correct positioning and
Heating sensor damaged
operation of the heating sensor
No water circulation in the system Check the circulating pump
Air in the system Vent the system
Exchangers dirty (clogged on
water side)
Clean the exchangers
Faulty water circulation
Fume thermostat contact open Check the thermostat
Wiring disconnected Check the wiring
Check the card parameter and modify
Wrong card parameter setting
it if necessary
Wiring disconnected Check the wiring
Faulty fan Check the fan
Card fault Check the card
Low pressure in the gas system Check the gas pressure
Burner minimum pressure setting Check the pressures
Check the card parameter and modify
Wrong card parameter setting
it if necessary
Wiring disconnected Check the wiring
Check the gas valve and replace it if
Faulty gas valve
necessary
Sensor damaged
Wiring shorted Check the wiring or replace the sensor
Wiring disconnected
Sensor damaged
Wiring shorted Check the wiring or replace the sensor
Wiring disconnected
Sensor damaged
Wiring shorted Check the wiring or replace the sensor
Wiring disconnected
Wiring disconnected Check the wiring
Check the gas valve and replace it if
Faulty gas valve
necessary
Fan fault Check the fan and fan wiring
Check the baffle and replace it if nec-
Wrong baffle
essary
Flue not correctly sized or
Check the flue
obstructed
Fault F20 generated 6 times in the
See fault F20
last 10 minutes
Check the card parameter and modify
Wrong card parameter setting
it if necessary
Check the card parameter and modify
Wrong card parameter setting
it if necessary
Check the electrical system
Electric mains trouble Check the electrical system
Pressure too low Fill the system
Water pressure switch damaged or
Check the sensor
not connected
Probe damaged or wiring shorted Check the wiring or replace the sensor
Probe disconnected after activat- Reconnect the external probe or disa-
ing the sliding temperature ble the sliding temperature
Delivery sensor or DHW sensor Check the correct positioning and
detached from the pipe operation of the sensors
Sensor damaged Replace the sensor
No system H O circulation
Check the circulating pump
2
Air in the system Vent the system
Modulating Operator wiring discon-
Check the wiring
nected
Check the gas valve and replace it if
Faulty gas valve
necessary
Inlet/exhaust flue obstruction Check the flue
EN
9