333
EN
cod. 3541V620 - Rev. 00 - 05/2021
ALHENA TECH H
3.4 Troubleshooting
Diagnostics
LCD display Off
If, even after touching the buttons, the display does not come on, check that the card is electrically
powered. Using a digital multimeter, check for presence of power.
In case of no voltage, check the wiring.
If the voltage is sufficient ( Range 195 – 253 Vac), check the fuse
(3.15AL@230VAC)
. The fuse
is on the card. To access it, see fig. 28.
LCD display On
In case of operation problems or faults, the display shows the fault identification code.
There are faults that cause permanent shutdowns (indicated with the letter "
A
"); to restore opera-
tion just press the button
for 1 second and confirm with the button
, or RESET via the re-
mote timer control (optional) if installed. If the boiler does not restart, the fault must be eliminated.
Other faults cause temporary shutdowns (indicated with the letter “
F
”) which are automatically re-
set as soon as the value returns within the boiler's normal working range.
Table of faults
Table 11- 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 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;
replace the electrode if necessary.
Insufficient gas supply pressure
Check the gas supply pressure
Trap blocked
Check the trap and clean it if necessary
Air/fume ducts obstructed
Remove the obstruction from the flue, fume extrac-
tion ducts, air inlet and terminals.
Wrong calibration
Do the Calibration procedure [AUTO SETUP].
Faulty gas valve
Check the gas valve and replace it if necessary
A02
Flame present signal with burner
off
Electrode fault
Check the ionization electrode wiring
Check the condition of the electrode
Electrode to ground
Cable to ground
Check the trap and clean it if necessary
Card fault
Check the card
F05
Fan fault
No 230V power supply
Check the 5-pin connector wiring
Tachometric signal interrupted
Fan damaged
Check the fan and replace it if necessary
Summary of Contents for ALHENA TECH 28 H
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