Euroterm E25, Instructions For Use, Installation & Maintenance

Page: 11 / 24

E25 / E29
11 EN
cod. 3541M540 - Rev. 01 - 06/2017
4.5 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. 9
Fault
code
Fault Possible cause Cure
A01 No burner ignition
Excessive condensate level Empty / clean the trap
No gas
Check the regular gas flow to the
boiler and that the air has been elimi-
nated 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 if
necessary
Gas valve wiring disconnected Check the wiring
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 protec-
tion activation
Heating sensor damaged
Check the correct positioning and
operation of the heating sensor
No water circulation in the system Check the circulating pump
Air in the system Vent the system
F04 Fume thermostat fault
Exchangers dirty (clogged on water
side)
Clean the exchangers
Faulty water circulation
Fume thermostat contact open Check the thermostat
Wiring disconnected Check the wiring
F05
Fume pressure switch fault
(contact fails to close)
Wrong card parameter setting
Check the card parameter and mod-
ify it if necessary
Fan fault
Wiring disconnected Check the wiring
Faulty fan Check the fan
Card fault Check the card
A06
No flame after the ignition
phase
Low pressure in the gas system Check the gas pressure
Burner minimum pressure setting Check the pressures
F07 Card parameter fault Wrong card parameter setting
Check the card parameter and mod-
ify it if necessary
A09 Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve
Check the gas valve and replace it if
necessary
F10 Delivery sensor 1 fault
Sensor damaged
Check the wiring or replace the sen-
sor
Wiring shorted
Wiring disconnected
F11 DHW sensor fault
Sensor damaged
Check the wiring or replace the sen-
sor
Wiring shorted
Wiring disconnected
F14 Delivery sensor 2 fault
Sensor damaged
Check the wiring or replace the sen-
sor
Wiring shorted
Wiring disconnected
A16 Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve
Check the gas valve and replace it if
necessary
F20 Combustion control fault
Fan fault Check the fan and fan wiring
Wrong baffle
Check the baffle and replace it if nec-
essary
Flue not correctly sized or
obstructed
Check the flue
A21 Poor combustion fault
Fault F20 generated 6 times in the
last 10 minutes
See fault F20
A23
Set nominal system water
pressure not reached within
4 minutes
Wrong card parameter setting
Check the card parameter and mod-
ify it if necessary
A24 4 fillings within 24 hours Wrong card parameter setting
Check the card parameter and mod-
ify it if necessary
F34 Supply voltage under 180V. 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
Water pressure switch damaged or
not connected
Check the sensor
F39 External probe fault
Probe damaged or wiring shorted
Check the wiring or replace the sen-
sor
Probe disconnected after activating
the sliding temperature Reconnect the external probe or dis-
able the sliding temperature
A41 Sensor positioning
Delivery sensor or DHW sensor
detached from the pipe Check the correct positioning and
operation of the sensors
F42 Heating sensor fault Sensor damaged Replace the sensor
F43
Exchanger protection acti-
vation.
No system H
2
O circulation
Check the circulating pump
Air in the system Vent the system
F50 Gas valve fault
Modulating Operator wiring discon-
nected
Check the wiring
Faulty gas valve
Check the gas valve and replace it if
necessary
A51 Poor combustion fault Inlet/exhaust flue obstruction Check the flue
Fault
code
Fault Possible cause Cure