Cornelius NITROPRO MINI Service And Preventative Maintenance Manual page 27

5.0 TROUBLESHOOTING (Cont.)
Table 5-4 - Dispensing-Function Troubleshooting
Malfunction
Nothing dispenses when tap
handle is pulled (refrigeration
is operating)
No water dispensed, concen-
trate only
No concentrate dispensed,
water only
Unit continues to dispense
after tap handle is released or
dispenses without operator
action
Product continuously drips
from dispense tube in OFF
mode
Pulsing effect in coffee stream
while dispensing
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Possible Causes
A. Door inner Dispense Motor switch is off
B. Mixing-Dispensing assembly wiring
harness is disconnected
C. Door interlock switch is open
D. Tap microswitch is not activating
E. Dispense solenoid valve or water inlet
solenoid not opening
F. Clogged orifice at dispense manifold valve
or in dispense-tube cap
G. No output from 24 Vdc power supply
H. No power to Main PCB or board has
failed
A. Water line inside cabinet is disconnected
from mixing-dispensing assembly
B. No water to dispenser, supply is off
C. Water inlet solenoid (at the rear of unit)
is clogged, binding or defective
D. Freeze-up of water coil in ice bank
A. BIB hose end not fully engaged into
connector on mixing-dispensing assembly
platform in cabinet
B. Concentrate too cold, not properly
thawed
C. Malfunctioning pump motor
D. No power to Main PCB or board failed
A. Dispense lever or dispense microswitch is
stuck in ON position
A. Water inlet solenoid at rear of unit or
dispense manifold solenoid valve is not
shutting off completely
A. Facility water pressure low, below 30 psi
B. Water inlet solenoid binding or pressure-
control components are malfunctioning
C. Concentrate pump malfunctioning
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Nitropro Mini Service Manual
Corrective Action
A. Turn on Dispense Motor switch
B. Connect harness in cabinet-wall socket
C. Door must be closed to allow
dispensing. Check interlock switch
operation & replace if necessary
D. Remove tap handle and inspect lever for
damage, verify switch operation, replace as
required (see section 6.10)
E. Verify 24 Vdc at both solenoids when
dispense switches are activated
F. Preform the weekly sanitize/cleaning
procedure in Install-Operator manual
G. Confirm power supply output voltage is
a steady 24 Vdc
H. Measure 24 Vdc input to board. Replace
fuse or board if necessary (see Fig. 6-1)
A. Reconnect water quick-disconnect
B. Restore water supply
C. Confirm 24 Vdc is present at solenoid
during dispensing; confirm solenoid coil is
not open-circuited; replace as required
D. Unplug dispenser & allow ice bank to
thaw for 2-4 hrs. Verify operation of
agitator motor & ice bank control; replace
components as required
A. Check connector o-rings, fully insert BIB
hose end into connector
B. Concentrate should be 35 to 40 °F (1.7 to
4.5 °C) with no ice prior to loading
C. Verify BIB hose connection and wiring
harness connection to pump
D. Measure 24 Vdc power input to board.
Replace fuse or board if necessary (see Fig.
6-1)
A. Remove tap lever shroud (sec. 6.10) and
inspect dispense switch and wiring harness
A. Flush/clean solenoid(s), replace parts as
necessary (see sections 6.4.3 & 6.6)
A. Correct water supply pressure to ensure
constant 35-90 psi (2.5-6.2 bar) is being
provided to unit
B. Clean and/or replace as necessary
C. Verify operation, replace as necessary
Publication Number: 548000106SER