Thermal Cut Out (Tco); Component Testing-Ice Maker - Viking RDDFF236 Service Manual

Service Diagnostics and procedures–Disassembly
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power to unit using power
switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure
correct earth ground and polarization. After servicing, reconnect power using power switch.
Ice Maker (continued)
cube release. Mineral content can also restrict
saddle valves. Verify water supply line is ON, water
pressure is not below 20 psi, saddle valve is fully
open and clear of restrictions. Fully close and open
valve to dislodge sediment (if necessary, remove
valve and enlarge pierced hole to 3/16" diameter
with a drill and reinstall saddle valve). Ensure water
line to unit is not pinched/kinked/or clogged, ice is
not present in inlet tube blocking water flow, or water
pressure is not above 120 psi.
Water fill can be increased by turning the adjustment
screw counterclockwise and decreased by turning
the screw clockwise. One-half turn will adjust the fill
by approximately two thirds of an ounce. If supply
is OK replace water valve. If no voltage is present,
verify harness. If OK, replace module.
Component Testing–Ice maker

Thermal Cut out (TCo)

Module ohmmeter Checks with no power to Ice maker and ejector Blades in end of Cycle
Test points
L-H
L-M
Module voltage Checks with Motor or Test light power to Ice maker
Test points
T-Module
T-H
L-H
L-M
N-V
© 2012 Viking Preferred Service
WARNING
Component
Mold & Heater
Motor
Component
Power ON
Bimetal
Heater
Motor
Water Valve
The TCO is a safety device and must NOT be
bypassed. If the TCO is found to be electrically
open, this indicates an overheat in the ice maker and
the ice maker must be replaced.
Module position
Attached to Support
Separate from Heater
line voltage
Power OFF
Open
ON
ON
ON
TCO
ohms
264
16,100
0 volts
Power OFF
Closed
OFF
OFF
OFF
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