Troubleshooting Chart
©2007 Viking Preferred Service
19
Symptom
Possible Cause
Test Procedure
Corrective Action
Failed Main dispenser
switch (failed short).
Disconnect power. Remove both
leads from the switch and
measure resistance across switch
terminals. Resistance should read
less than 1
Ω
in this position and
higher than 10 M
Ω
when switch is
open.
Replace switch.
Water starts to
dispense as soon as
Water mode is
selected without
pressing the Main
dispenser switch.
Failed Fountain Display
Board.
With unit powered, measure
voltage on pin-4 (LT/BU) to pin-1
(BK/GN) on Fountain Display
Board. Voltage should read
0 VDC.
If 12 VDC present
replace Fountain
Display Board. If 0
VDC present,
replace MPCB.
Failed Main dispenser
switch (failed open).
Disconnect power. Remove both
leads from the switch and
measure resistance across switch
terminals. Resistance should read
less than 1
Ω
in this position and
higher than 10 M
Ω
when switch is
open.
Replace switch.
Failed Fountain display
board or MPCB
With unit powered, close main
dispenser switch and press cubed
pad.
Measure 12 VDC between pin-1
(BK/GN) to pin-4 (LT/BU) on
Fountain Display Board.
No 12 VDC, replace
Fountain Display
Board. 12 VDC
present, check for
120 VAC on J1 pin-2
(OR/YL) on MPCB.
No 120 VAC, replace
MPCB.
Cubed LED is
illuminated but does
not dispense cubed
ice when Main
dispenser switch is
pressed.
Failed auger motor or PCB.
With unit powered, press the Main
dispenser switch. Measure voltage
on J1 pin-2 (OR/YL). Voltage
should read 120 VAC.
Replace auger motor
if voltage reads
120VAC. If no 120
VAC, replace MPCB.
Failed Main dispenser
switch (failed short).
Disconnect power. Remove both
leads from the switch and
measure resistance across switch
terminals. Resistance should read
higher than 10 M
Ω
when switch is
open and less than 1
Ω
when
switch is closed.
Replace switch.
Cubed ice starts to
dispense as soon as
Cubed mode is
selected without
pressing the Main
dispenser switch.
Failed Fountain Display
Board.
With unit powered, measure
voltage on pin-1 (BK/GN) to pin-4
(LT/BU) on Fountain Display
Board. Voltage should read
0 VDC.
If 12 VDC present
replace Fountain
Display Board. If
0 VDC present,
replace MPCB.
Dispenser operates
continuously even
when Dispenser
Lock mode is
activated.
Failed Fountain Display
Board.
With unit powered, measure
voltage on pin-1 (BK/GN) to pin-4
(LT/BU) on Fountain Display
Board. Voltage should read 0
VDC.
12 VDC present,
replace Fountain
Display Board. If
0 VDC present,
replace MPCB.