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FERSYSTEM TECH 38 C
Cod. 3540U330 - 09/2009 (Rev. 00)
3.4 Troubleshooting
Fault Diagnosis
In the event of operating problems or trouble, the display will flash and a fault identification code
appears.
There are faults that in order to restore operation the RESET button must be pressed (ref.6 - fig. 1); or
if the boiler fails to start, it will be necessary to repair the fault (code nos. F1 to F24). Other faults cause
temporary shutdowns that are automatically reset as soon as the value comes back within the boiler’s
normal working range (codes from 25 to 47).
When the boiler starts functioning normally again, the display stops flashing and the fault code disap-
pears.
Fault
Possible cause
Cure
A01
No burner ignition
No gas
Check the regular gas
fl
ow to the boiler and 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 ionizing 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
fl
ow sensor
No system circulation
Check the 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
fl
ue
A05
Fan problem
Tachometer signal interrupted for 1
hour or longer
Check the wiring and the fan
A06
No
fl
ame after the ignition phase (6
times in 4 min.)
Detection electrode fault
Check that the electrode is correct positioned and if
necessary change it
Flame unstable
Check the burner
Incorrect valve gas Offset
Check Offset at the minimum power
Flue gas circuit obstructed
Check if
fl
ue gas circuit is free
Siphon obstructed
Check and if necessary change the siphon
A41
Flow sensor disconnected
Sensor disconnected
Check the correct position and operation of the
fl
ow
sensor
F07
Flue gas fault
The exhaust gases temperature
becomes higher than 95°C for 2
minutes.
Check the
fl
ue
F10
Flow sensor fault
Sensor damaged or short circuited
Check the wiring or change the sensor
Sensor damaged or wiring broken
Check the wiring or change the sensor
F11
Return sensor fault
Sensor da maged or wiring shorted Check the wiring or change the sensor
Sensor damaged or wiring broken
Check the wiring or change the sensor
Summary of Contents for FERSYSTEM TECH 38 C
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