Figure A-24. Dispenser Resets But Will Not Dispense Product - Wayne Dresser Vista 1 Series Service Manual

C h e c k f o r : 1 1 0 VA C o u t p u t
f r o m S o l e n o i d D r i v e B d t o
r e l a y ( s ) a n d A C v a l v e ( s )
i f N o n - B l e n d e r o r
2 4 V D C ( J 3 ) o u t p u t t o
v a l v e ( s ) i f B l e n d e r .
Check for: 110VAC
on relay select wires and
valve(s) in junction box if
Non-Blender or
24VDC on proportional
valve(s) and 110 VAC on
relay select wires if Blender.
Check actuator, or
Blender, or relay coil

FIGURE A-24. DISPENSER RESETS BUT WILL NOT DISPENSE PRODUCT.

February 1997
Dispenser resets but
will not dispense
product(s).
Check F1 fuse on
the solenoid drive
board. Replace if it
is open.
Is 110VAC
NO
or ( 24VDC)
present?
YES
Is 110VAC
NO
or ( 24VDC)
present?
YES
proportional valve if
for continuity.
Is the
coil reading
YES
an open circuit?
NO
Replace defective
actuator, relay, or
if Blender, the
proportional valve.
Is the
problem
YES
corrected?
NO
If Non-Blender, replace
solenoid drive board.
If Blender, replace solenoid
drive board if 24VDC is
present at J4. If not present
check F1 on 24VDC
power supply board. Replace
F1 if it is open and replaceable.
Repair or replace the
defective internal
dispenser wiring.
Replace
the actuator coil,
proportional valve if Blender,
or the relay.
END
Is the
problem
YES
corrected?
NO
If Non-Blender, replace
computer assembly.
If Blender, wiring harness
that comes with computer
assy and/or computer assy
is faulty. Replace computer
assembly.
Part No. 920160 Rev A
97