T-ONE C HE
26 EN
cod. 3541D730 - Rev. 00 - 05/2013
3.5 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.
Certain faults cause permanent boiler shutdowns (marked with the letter “A”): to restore operation, press the RESET
button (detail 6 - fig. 1) for 1 second or RESET on the optional remote timer control if installed; if the boiler fails to start,
it is necessary to firstly eliminate the fault.
other faults (indicated 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. 6 - List of faults
Fault
code
Fault Possible cause Cure
A01 No burner ignition
No gas
Check the regular gas flow to the boiler and that the air has been purged
from the pipes
Detection or Ignition electrode fault Check that the electrodes are correctly positioned and free of any deposits
Defective gas valve Check and change the gas valve
Incorrect inlet gas pressure Check inlet gas pressure
Siphon obstructed Check and if necessary change the siphon
A02
Flame detected with
the burner off
Ionisation electrode defective Check the ionising electrode wiring
Main board defective Check the PCB
A03 High limit protection
Flow temperature sensor not active or correctly
located
Check the correct positioning and operation of the flow sensor
No system circulation
Check pump and radiator valves present in the system
Check operation of the internal by-pass
A04 Flue gas fault Fault F07 happened 3 times in the last 24 hours Check the flue
A05 Fan problem Tachometer signal interrupted for 1 hour or longer Check the wiring and the fan
A06
No flame after the
ignition phase (6
times in 4 minutes)
Detection electrode fault Check that the electrodes are correctly positioned and if necessary change it
Flame unstable Check the burner
Incorrect valve gas Offset Check the Offset at the minimum power
Flue gas circuit obstructed Check if flue gas circuit is free
Siphon obstructed Check and if necessary change the siphon
A41
Flow sensor
disconnected
Sensor disconnected Check the correct positioning and operation of the flow sensor
A42 Flow sensor fault Sensor damaged Change the sensor
F07
High fume
temperature
The exchanger probe detects and excessive
temperature for over 2 minutes
Check the exchanger
F10 Flow sensor fault
Sensor damaged or short circuited
Check the wiring or change the sensor
Sensor damaged or wiring broken
F11 Return sensor fault
Sensor damaged or wiring shorted
Check the wiring or change the sensor
Sensor damaged or wiring broken
F12 DHW sensor fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F13
Exchanger probe
fault
Sensor damaged or wiring shorted
Check the wiring or replace the probe
Sensor damaged or wiring broken
F14 Flow sensor fault
Sensor damaged or short circuited
Check the wiring or change the sensor
Sensor damaged or wiring broken
F15 Fan problem
Tachometer signal interrupted, fan connection Check the wiring and the fan
Fan damaged, debris in fan Check the fan, clean debris
F34
Supply voltage under
170V
Electric supply problem Check the electrical system
F35
Irregular mains
frequency
Electric supply problem Check the electrical system
F37
Incorrect system
water pressure
Pressure too low Fill the system
Sensor damaged Check the sensor
F39 External probe fault Sensor damaged or short-circuited Check the wiring or change the sensor
F43
Exchanger
protection activation.
No system H
2
O circulation
Check the circulating pump
Air in the system Vent the system
F52 Flow sensor fault Sensor damaged Change the sensor
A61
Controller ABM03
fault
Controller ABM03 internal error Check the earth connection and replace the controller if necessary.
A62
No communication
between controller
and gas valve
Controller not connected Connect the controller to the gas valve
Valve damaged Replace the valve
A63
A64
F66
Controller ABM03
fault
Controller ABM03 internal error Check the earth connection and replace the controller if necessary.
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