Service manual

Quest Installation and Service Manual
Revision B - 14 - 720506904
Warm Drink • Ambient air around dispenser is
too warm
• Relocate dispenser
• Excessive demand on dispenser • Add water pre-cooler or second
dispenser
• Dirty condenser coil • Clean condenser coil
• Inoperative condenser fan • Replace condenser fan motor
• Defective Ice Bank Control • Test and replace if necessary
• Loss of refrigerant charge due to
leak in system
• Repair leak and recharge system
Water continuous-
ly drips from noz-
zle when in OFF
mode
• Main water solenoid at base of
unit or water solenoid on pump
platform not shutting off tightly
• Clean solenoid(s), replace parts
as necessary (refer to the
Planned Maintenance Section)
Concentrate
warm, water cold
• Cabinet fan inoperable • Check/replace fan
• Agitator motor/pump inoperable
or restricted
• Check/replace agitator motor
• Loss of refrigerant charge due to
leak in system
• Repair leak and recharge system
Brix Problem • Water supply pressure too low,
less than 20 psi (1.4 bar) flowing
water pressure fluctuates sharply
• Correct water supply problem to
ensure a constant 40 psi (3 bar)
flowing to the dispenser
• Water flow control binding or
spring is defective
• Clean and/or replace parts as
necessary
• Improperly thawed concentrate.
Brix changes as the concentrate
temperature changes (concen-
trate becomes thinner as temper-
ature rises)
• Concentrate should be 35-40°F
(1.7-4.5°C) prior to loading
Pump Inoperative • Pump motor defective • 28VDC should be present at
pump motor during dispense. If
voltage is present and motor
does not start, replace pump
motor
• No power to transformer or no
28VAC output from transformer
• Confirm transformer has line volt-
age present on primary side. If no
28VAC output from the second-
ary replace transformer
• Defective voltage regulator board
(VRB) located inside front electri-
cal box
• Confirm board produces 28VDC
present when the dispense but-
ton is pressed (refer to the Elec-
trical Box Wiring Diagram for
VDC output location). Replace
VRB if necessary
• Defective dispense control board
(Push button or portion control)
• Test and replace if necessary
PROBLEM PROBABLE CAUSE REMEDY