Dispensing-Function Troubleshooting - Cornelius Nitropro Mini Service And Preventative Maintenance Manual

Nitropro Mini Service Manual
5.4 D -F
ISPENSING UNCTION
Malfunction
Nothing dispenses when tap
handle is pulled (refrigera‐
tion 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
Publication Number: 548000106SER
T
ROUBLESHOOTING
Possible Causes
A. Door inner Dispense Motor switch is off
B. Mixing‐Dispensing assembly wiring har‐
ness 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 con‐
nector on mixing‐dispensing assembly plat‐
form 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 dis‐
pense manifold solenoid valve is not shut‐
ting 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
‐ 22 ‐
Corrective Action
A. Turn on Dispense Motor switch
B. Connect harness in cabinet‐wall socket
C. Door must be closed to allow dispens‐
ing. 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 agita‐
tor motor & ice bank control; replace com‐
ponents 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 40‐65 psi (275.8‐448.2 Kpa) is
being provided to unit
B. Clean and/or replace as necessary
C. Verify operation, replace as necessary
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