Viking VISC530 - Oven Sensor & Line Break Relay Testing

© 2009 Viking Preferred Service
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Service Diagnostics and Procedures
Oven Sensor
The oven sensor is a resistive thermal device that
has a positive temperature coefficient. The sensor
measures change in resistance and communicates
this to the control board. The chart below shows
the characteristics of the sensor.
RTD Resistive Thermal Device
Temperature (˚F) Resistance (Approximate)
50 1038
75 1090
100 1143
200 1350
300 1553
350 1654
400 1754
450 1852
500 1950
550 2047
600 2153
650 2238
700 2332
750 2425
800 2318
850 2609
900 2700
To access the oven sensor, open the oven door,
remove the securing screws and guide wiring into oven
cavity. Disconnect wiring and sensor is accessible.
Check the oven sensor per the resistance chart above.
If the sensor is out of range replace the sensor.
Line Break Relay
The line break relay is a device that breaks the L2
side of line voltage. As the relay is energized, the
relay closes allowing L2 to flow to the convection,
broil and bake element.
To access the line break relay, remove the lower access
panel, slide the control board out and the line break
relay is mounted on the board. To check the relay,
verify 120VAC. If power is present and no output to
the elements, replace the line break relay. If 120VAC
is not present, check source voltage and wiring.
Oven and Surface Area Cooling Fans
The VISC incorporates two cooling fans. Both fans
are wired in parallel to each other. The top fan
is designed to circulate air around the Induction
modules whenever the oven is switched on, as is the
lower cooling Fan. NOTE: The hall effect sensor only
monitors the lower fan, not the upper!
To access the upper fan assembly, remove control
panel, main top, screw securing right induction
module and set module to side. Upper fans is
now accessable at right rear. To access lower fan
assembly, pull unit out of installation. Remove rear
cover, remove screws securing lower fan assembly.
Lower fan is now accessible.
To check fan, measure the resistance and voltage. If
all checks are good and the unit still stops working,
replace the control board.
Oven Sensor
Line Break Relay
Induction Area Cooling Fan
Oven Cooling Fan