Defrost Thermostat - Viking VCFF136D 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.

Defrost Thermostat

The defrost terminator is a bimetal switch that is
normally open. When the temperature drops below
12˚F ± 5˚ (Need to verify threshold), the defrost
thermostat closes. This will allow voltage to flow to
the defrost heater.
Once the freezer section reaches 42˚F ± 7˚, the
terminator opens and power to the heater is
broken.
To access defrost thermostat:
1. Remove upper bins (see upper bin section,
page 59).
2. Remove freezer door and rail assemblies
(see freezer door and rail assembly section,
page 60).
3. Remove left and right glide adapters (see glide
adapter section, page 60).
4. Remove evaporator cover (see evaporator cover
section, page 61).
5. Disconnect wiring and un-clip thermostat.
© 2010 Viking Preferred Service
WARNING
Defrost Thermostat
6. Repair or replace defrost thermostat.
7. Reverse procedure to reinstall.
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