Service manual

Quest Installation and Service Manual
720506904 - 13 - Revision B
No water dis-
pensed, concen-
trate only
(continued)
• Water solenoid located on pump
platform clogged or defective
• Disassemble and clean sole-
noid. Replace if necessary.
• Main water solenoid/strainer
located at the rear of dispenser is
clogged, binding or defective
• Remove and clean strainer. Con-
firm 28VDC is present at solenoid
during dispense. Confirm sole-
noid coil is not open. Disassem-
ble and clean solenoid.
• Water supply pressure is greater
than 100 psi (7 bar) forcing the
brix flow control closed
• Add external regulator and lower
pressure to 40 psi (3 bar)
• Freeze-up of water coil in ice
bath
• Unplug dispenser and allow 2-4
hours to thaw. Check operation of
agitator motor and ice bank con-
trol.
• Refrigeration system may be low
on charge resulting in a deformed
ice bank and freeze-up of the
water coil in the ice bath.
No water and no
concentrate, re-
frigeration is work-
ing
• Black service switch located on
the rear of the cabinet door in
OFF position
• Turn on switch
• White door switch open • Door switch must be closed in
order to dispense. Check switch
operation and replace if neces-
sary.
• 6.25 amp fuse inside front electri-
cal box blown
• Replace with 6.25, 250VAC slow
blow fuse and test
• No output from Transformer • Confirm transformer output by of
26VAC +/- 2. Replace trans-
former if necessary.
• Defective voltage regulator board
(VRB) located inside front electri-
cal box
• Measure across the VDC output
of the board. There should be
28VDC present when the dis-
pense button is pressed.
Replaced VRB if necessary.
• Defective dispense push button
or portion control board
• Test and replace if necessary
No concentrate
dispensed, water
only
• Concentrate container not fully
engaged into receptacle on pump
platform
• Refer to Concentrate Loading
section of this manual
• Dispense/Flush lever in FLUSH
position
• Move lever to DISPENSE posi-
tion
• Concentrate too cold, not prop-
erly thawed
• Concentrate should be 35-40°F
(1.7-4.5°C) prior to loading
• Defective pump motor • Replace pump motor
PROBLEM PROBABLE CAUSE REMEDY