311
EN
cod. 3542A221 - Rev 00 - 10/2022
ALHENA TECH K 50
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 hold down the button
until the message
“Confirm?”
appears and confirm with the but-
ton
, or use the RESET of the remote 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 12- 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 extraction ducts, air inlet and ter-
minals.
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 inte-
rrupted
Fan damaged
Check the fan and replace it if necessary
Summary of Contents for ALHENA TECH 28 K 50
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Page 223: ...223 EL cod 3542A221 Rev 00 10 2022 ALHENA TECH K 50 FH Fh Stop 10 0 FH 2 Stop...
Page 234: ...234 EL cod 3542A221 Rev 00 10 2022 ALHENA TECH K 50 2 2 1 2 2 B 2009 142 5 C 15 C A 2 3 B...
Page 237: ...237 EL cod 3542A221 Rev 00 10 2022 ALHENA TECH K 50 2 5 B B 3 mm 3A...
Page 238: ...238 EL cod 3542A221 Rev 00 10 2022 ALHENA TECH K 50 B HAR H05 VV F 3x0 75 mm2 8 mm B 230 V...
Page 241: ...241 EL cod 3542A221 Rev 00 10 2022 ALHENA TECH K 50 2 6 B 200 Pa H1 C AUTO SE TUP...
Page 247: ...247 EL cod 3542A221 Rev 00 10 2022 ALHENA TECH K 50 B 2 7 B 0 5 lt B 37...
Page 256: ...256 EL cod 3542A221 Rev 00 10 2022 ALHENA TECH K 50 3 3 B B 1 1 41 2 41 2 3 1 1...
Page 257: ...257 EL cod 3542A221 Rev 00 10 2022 ALHENA TECH K 50 1 42 42 1 bar venturi OK NO 1 1...
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