NECTA SPA TECHNICAL MANUAL
“ Snakky “
Manual
Snakky
19
/ 23
10 – TROUBLESHOOTING
Problem
(and/or indication on the
display)
Possible cause
Solution
The display indicates
the message:
“Compressor”
If the compressor runs for 24 hours
consecutively without the cabinet reaching
the temperature set via the SW, the machine
is locked and the selection disabled.
The following could be the cause:
Lack of gas in the refrigerating circuit.
Failure to the evaporator’s electric fan.
Failure to the condenser’s electric fan or PTC
triggered.
Clogged rear and/or side grille
Failed probe (in this case the message “probe
failure” will be displayed)
Normally two to four hours are required to
reach the operating temperature (according to
the load). A longer time means that there is a
malfunction: check for any small leaks in the
refrigerating gas circuit; if necessary repair the
leak and charge with the correct dose of gas.
Check that the electric fans work correctly.
Check for the correct cooling airflow inside the
refrigerated box. In the case of failure to
components, replace with original parts.
The display indicates
the message
“Coin mechanism”
If the CPU for more than 30 seconds does
not receive communication impulses from an
Executive serial coin mechanism, or 75
seconds from a BDV serial coin mechanism,
or if it receives an impulse for longer than 2
seconds, the machine locks and the
selections are disabled.
Replace the coin mechanism with one that is
certain to work and check the communication.
Check connections.
Check the CPU board, and if necessary replace
with that is certain to work.
Check that the 24 V DC power supply fuse is
intact.
The display indicates
the message
“RAM data”
One or more areas of the RAM contain wrong
data, which could change the operating
default values.
The machine will continue working, but some
parameters could have been changed, with
consequences to the general functioning -
the RAM needs to be initialised as soon as
possible to recover data from the EPROM.
Initialise the CPU again.
After initialising, all data settings will go back to
the default settings; restore the customised
data using the programmer or a PC.
If, in spite of initialising, the malfunction
persists, replace the CPU board with an already
tested one that is certain to work. It the
malfunction persists, replace the cables or
check the suitability of connections.
The machine was designed to comply with the
EMC directive, but if located in an environment
subject to high interference immunity problems
could arise, therefore in the event of such
interference persisting the vending machine
should be moved to a different location.
The display indicates
the message
“Probe”
The temperature control probe in the
refrigerated box is of the NTC type, with the
internal resistance that changes as the
temperature changes.
If the probe is interrupted, the machine locks
after 5 minutes from the failure and the
selections are disabled (THE DISPLAY WILL
INDICATE THE TEMPERATURE – 5 ° C)
If there is a short-circuit in the probe, the
machine locks after 60 minutes and the
selections are disabled (THE DISPLAY WILL
INDICATE THE TEMPE32° C)
NB
: AFTER THE SENSOR FAILURE HAS BEEN
DISPLAYED FOR TWO HOURS, A
COMPRESSOR FAILURE WILL ALSO BE
INDICATED.
Check the internal resistance in the NTC probe
using a digital multimeter: A resistance of 730
ohm corresponds to a temperature of 30° C.
A resistance of 2612 ohm corresponds to a
temperature of 0° C (melting ice).
Replace the probe with an original one; before
installing the new one check that the internal
resistance corresponds to the above
parameters.
Reset the failures by accessing the special
function