Troubleshooting
18
©2012 Viking Preferred Service
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
RTD Sensor
Proper diagnostics of the RTD (Resistance Temperature
Detector) will eliminate unnecessary replacement.
The RTD is designed to change resistance as the
temperature in the oven cavity changes. As the
temperature increases, so does the resistance. At 75°F,
the resistance should be approximately 1090 ohms.
Locate the P14 connector on control board. The violet
and grey wires go to the oven sensor.
With the Molex plug removed, use an ohmeter to
measure resistance between the violet and grey wires
in the Molex connector. At ambient temperature, you
should read around 1090 ohms (±10%). An open reading
(∞) indicates either a broken wire or an open RTD.
Finally, test each wire to ground to check for a pinched
wire to the oven frame. If wiring is OK, replace the
sensor.
If the RTD resistance is within the specifications given,
it is not necessary to replace the RTD. If the RTD test
resistance is within specifications and the consumer
is having erratic oven temperatures, please call Viking
Technical support (1-800-914-4799) for assistance.
RTD Characteristics
RTD (Resistance Temperature Detector)
Temperature (°F)
Approximate Resistance (
W
)
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
2518
850
2609
900
2700
NOTE:
Door switch must be depressed in order for
the convection fan and all convection cycles to
operate when the door is opened.