Viking VCSF036SS Service Book page 20

Troubleshooting Chart
Symptom
Auto Light mode
does not operate.
Ice or Water
dispenser
mechanism runs
continuously.
Filter Status LED
never changes to
red.
Auger motor
operates in Cubed or
Crushed mode but
ice door chute never
opens.
Auger motor
operates in Cubed or
Crushed mode but
ice door chute never
closes.
No LED lit, Water
dispenser operates,
auger motor
operates only in
Cubed mode and ice
chute door does not
open or remains
open.
No LED lit, Water
dispenser operates,
auger motor
operates only in
Cubed mode and
dispenser light is on
continuously.
20
Possible Cause
Failed MPCB.
Failed Main dispenser
switch (failed short).
Failed MPCB.
Failed PCB.
Failed solenoid.
Failed MPCB.
Failed MPCB.
Failed MPCB.
Failed MPCB.
Test Procedure
With unit powered and Auto Light
activated, cover the light sensor.
Measure voltage on VT/BK of 6-
pin door connector to WH on 2-pin
door connector. Voltage should
read 1/2 the AC power supply (120
VAC).
Disconnect power. Remove both
leads from the switch and
measure resistance across switch
terminals. Resistance should read
higher than 10 MΩ when switch is
open and less than 1 Ω when
switch is closed.
With unit powered, measure
voltage on pin 1, 2, or 3 of J1.
Voltage should read 0 VAC.
Verify with the user if unit has
been unplugged for a long period.
Demonstrate reset operation to
customer.
Disconnect power. Remove both
leads from the solenoid and
measure the resistance across
solenoid terminals. Resistance
should read 101.2 ± 10%.
With unit powered and auger
motor operating, measure
approximately 55 VAC on pin-4 of
J1 on MPCB.
Measure voltage on pin-4 of J1 on
MPCB. Voltage should read
approximately 55 VDC when ice
chute door is open (solenoid
energized) or 0 VDC when closed
(solenoid not energized).
Corrective Action
Incorrect voltage,
replace MPCB.
Replace switch.
Voltage present,
replace MPCB.
Replace water filter
and reset Filter
Status. Replace
MPCB if problem
continues. Customer
education.
Replace solenoid.
No 55 VAC, replace
MPCB.
Incorrect voltage,
replace MPCB.
Replace MPCB
Replace MPCB.
©2007 Viking Preferred Service