Cornelius QUEST ELITE 4000 Service Manual page 26

Quest Elite 4000 Service Manual
Symptom
Warm drinks
Water continuously
drips from nozzle in
OFF mode.
Concentrate warm,
water cold.
BRIX problem
Pump inoperative
Machine continues to
dispense after dis-
pense button is
released or dis-
penses without oper-
ator input.
Publication Number: 620048956SER
Table 2
Probable Cause
A. Ambient air around dispenser is too
warm.
B. Excessive demand on dispenser.
C. Dirty condenser coil.
D. Inoperative condenser fan.
E. Defective Ice Bank Control.
F. Loss of refrigerant charge due to leak
in system.
A. Main water solenoid at base of unit or
water solenoid on pump platform not
shutting off completely.
A. Cabinet fan inoperable.
B. Agitator motor/pump inoperable or
restricted.
C. Loss of refrigerant charge due to leak
in system.
A. Water supply pressure too low, less
than 20 psi (1.4 bar) flowing water
pressure.
B. Water flow control binding or spring is
defective.
C. Improperly thawed concentrate. BRIX
changes as concentrate temperature
changes (concentrate becomes thinner
as temperature rises)
A. Pump motor defective.

B. No power to transformer or no 24VAC
output from transformer.
C. Defective voltage regulator board
(VRB) located inside front electrical
box.

D. Defective dispense control board
(Push button or portion control).
A. Push button or portion control pad
stuck in ON position.

B. Relay on voltage regulator board
(VRB) stuck on.
- 22 -
Remedy
A. Relocate dispenser.
B. Add water pre-cooler or second dis-
penser
C. Clean condenser coil.
D. Replace condenser fan motor.
E. Test & replace if necessary.
F. Repair leak and recharge system.
A. Clean solenoid(s), replace parts as
necessary (refer to Planned Mainte-
nance section).
A. Check/replace fan.
B. Check/replace agitator motor.
C. Repair leak & recharge system.
A. Correct water supply problem to
ensure a constant 50 psi (3.5 bar)
flowing to dispenser.
B. Clean and/or replace parts as neces-
sary.
C. Concentrate should be 35 to 40
°
to 4.5 C) prior to loading.
A. 28VDC should be present at pump
motor during dispense. If voltage is
present & motor does not start,
replace motor.
B. Confirm transformer has line voltage
present on primary side. If no 24VAC
output from secondary, replace trans-
former.
C. Confirm board produces 28VDC pres-
ent when dispense button is pressed
(refer to Electrical Box Wiring Diagram
for VDC output location). Replace VRB
if necessary.
D. Test & replace if necessary.
A. Disconnect wire harness from rear of por-
tion control and close the door. If unit
does not dispense on its own, dispense
control board is bad (stuck on).
B. Disconnect 4-wire harness from lower
right comer of VRB. If unit continues to
dispense on its own VRB is defective
(relay stuck on).
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