© 2010 Viking Preferred Service
65
Service Diagnostics and Procedures
Defrost Heater–Non Dispenser Model
1. Follow steps 1-4 under evaporator fan
non-dispenser model.
2. Remove screws securing rear panel and remove
rear panel.
3. Remove clips securing defrost heater,
disconnect wiring, and repair/replace defrost
heater (see step 4 dispenser model).
4. Reverse procedure to reinstall.
Defrost Terminator
The defrost terminator is a bimetal switch that is
normally open. Below 20+/-8.5 ˚F, the terminator is
closed. In order to test, first switch the main power
switch to “Off”. Locate the brown wire on E5 of the
HV board. Unplug the wire and check for
continuity between the brown wire and the black
wire at E10. If “0” is read then the bimetal is closed.
It infinity (∞) is read, the bimetal is open.
Note: Freezer temp must be below 20+/-8.5 ˚F
in order to check for a defective bimetal.
Another method to test can be achieved by testing
at the 15-wire Molex plug on the right side of the
Control Housing. Refer to page 82 pin locations.
To access the defrost terminator:
1. Follow steps 1-4 under Defrost Heater
disassembly.
2. Unclip the terminator, disconnect wiring, repair/
replace terminator.
3. Reverse procedure to reinstall.
WARNING
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.
Evaporator Cover
Freezer Thermistor
Defrost Terminator
To Next Page
Loading...
