Troubleshooting Chart
18
©2007 Viking Preferred Service
Dispenser Troubleshooting Chart
Symptom
Possible Cause
Test Procedure
Corrective Action
Switch failure in freezer
door.
With unit powered, open freezer
door. Press freezer door switch in.
If freezer light does not turn off,
switch is defective.
Replace switch.
Incorrect harness wiring.
Verify wire color on MPCB 10-pin
connector (J4) and 4 pin connecter
(J1). Refer to Table A.
Verify wire color on Fountain
Display Board 4-pin (J1) and 2-pin
(J2) connectors.
Correct wiring.
No LED lit.
No power to the Fountain
Display Board.
With unit powered, measure
voltage between pin-3 (RD/BK)
wire and pin-1 (BK/GN) wire on
Fountain Display Board. Meter
should read 12VDC.
Replace Fountain
Display Board if
meter reads 12 VDC.
No 12 VDC, repair
open connection or
replace MPCB.
No continuity.
Disconnect power. Measure
continuity between VT/BK wire of
door 6-pin connector and WH wire
of door 2-pin connector.
Replace bulb or
repair open
connection.
No dispenser light
when water
dispenser pad is
pressed in Water,
Crushed, or Cubed
mode.
Failed light bulb or Fountain
Display Board.
With unit powered, press the Main
dispenser switch. Measure voltage
on VT/BK wire of door 6-pin
connector and WH wire of door 2-
pin connector. Voltage should read
120 VAC.
Replace dispenser
light bulb or Fountain
Display Board if
voltage reads 120
VAC. No 120VAC,
repair open
connection or
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
less than 1
Ω
in this position and
higher than 10 M
Ω
when switch is
open.
Replace switch.
Dispenser light is on
(light selections off)
without pressing the
Main or Water
dispenser switch in
Water, Crushed, or
Cubed mode.
Failed Fountain Display
Board.
With unit powered, measure
voltage on VT/BK wire of door 6-
pin connector and WH wire of door
2-pin connector. Voltage should
read 0 VAC.
120 VAC or 1/2 the
AC power supply
voltage present,
replace Fountain
Display Board or
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.
Water LED is
illuminated but does
not dispense water
when Main dispenser
switch is pressed.
Failed Fountain display
board or MPCB
With unit powered, close main
dispenser switch and press water
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-1
(YL/WH) on MPCB.
No 120 VAC, replace
MPCB.