NECTA SPA TECHNICAL MANUAL
“
SFERA
“
Manual
“ SFERA”
15 /
19
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 refrigeration circuit due to
possible leaks.
Failure to the evaporator’s electric fan.
Failure to the condenser’s electric fan or PTC
triggered.
Clogged lower 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 lowers as the
temperature rises.
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
software function. See programming
manual
7 – TROUBLESHOOTING
