Trouble-Shooting - Necta Koro Service Manual

PROBLEM
(and/or indication on the display)
The machine does not
go into the boiler
heating phase and the
display shows the
message
"W
ATER FAILURE
(espresso versions)
The display indicates
the message
"N "
O COFFEE
The display indicates
the message
"W
ASTE CONTAINER FULL
The display indicates
the message
"A - "
IR BREAK
The display indicates
the message
"V
OLUMETRIC COUNTER
NW Global Vending – TECHNICAL MANUAL
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New dispenser "KORO"
28 – TROUBLE-SHOOTING
POSSIBLE CAUSE
If the micro-switch of the air-break (if
fitted) float in the instant boiler, or of the
float in the water supply tank, is not
activate within one minute, the software
disables the machine.
"
If the coffee grinder exceeds the grinding
speed for longer than 5 seconds, the
espresso coffee selections are disabled. All
instant product selections remain available.
When the float in the liquid waste tray
triggers the signal micro-switch.
"
The machine locks if after 10 selections the
float micro-switch does not change
position.
When the counter does not signal any
counting within a time-out set by default.
"
Check the following situations:
Machine with air-break: check that there is
water from the mains; if this is the problem,
wait for the water from the mains to be
resumed. Otherwise, check the operation of the
inlet solenoid valve from the mains, check the
operation of the air-break micro-switch
Machine with instant boiler: in this case it is
the boiler to perform the air-break function.
Then, repeat the above checks.
Machine with water supply tank:
Check the operation of the magnetic float, and
of the water supply pump.
Check the activation of relays K1 and K14
When an espresso coffee selection is made the
grinder is activated conveying coffee directly to
the brewing chamber of the Z3000 unit, and the
amount is determined by the number of
revolutions of the grinding wheels by means of
a special sensor.
Check the presence of coffee
Check the distance between the grinding wheels
Check the presence of the sensor
Check the functioning of the relay K16
Empty the tray, removing it from the lower
section of the cabinet.
Check the operation and correct functioning of
float and micro-switch.
Check the following situations:
Machine with air-break: check that there is
water from the mains; if this is the problem,
wait for the water from the mains to be
resumed. Otherwise, check the operation of the
inlet solenoid valve from the mains, check the
operation of the air-break micro-switch
Machine with instant boiler: in this case it is
the boiler to perform the air-break function.
Then, repeat the above checks.
Machine with water supply tank:
Check the operation of the magnetic float, and
of the water supply pump.
Check the activation of relays K1 and K14
The water amounts necessary for espresso
coffee selections are ensured by a volumetric
counter that with the water flow causes a wheel
to rotate and sends to the software a number of
pulses corresponding to the set water dose; if
such dose is not reached within 60 seconds it
means that there is a problem.
Check that there is water (see above); check
that there are no obstructions to the correct
flow of water.
Check the correct functioning of the impellers.
There must be 5 VAC on the terminals during
the counter operation. Check that coffee was
ground correctly and that dose is accurate.
Check that the coffee filters are not clogged.
07/10/2005
SOLUTION
page 36 / 42