Rtd Sensor; Rtd Characteristics - Viking RDSCG230-5B Service Manual

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 P15 connector on control board. The grey
wires go to the oven sensor.
With the Molex plug removed, use an ohmeter to
measure resistance between the 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.
©2012 Viking Preferred Service

RTD Characteristics

RTD (Resistance Temperature Detector)
Temperature (°F)
50
75
100
200
300
350
400
450
500
550
600
650
700
750
800
850
900
NOTE: Door switch must be depressed in order for
the convection fan to operate when the door is
opened.
Troubleshooting
Approximate Resistance (
1038
1090
1143
1350
1553
1654
1754
1852
1950
2047
2153
2238
2332
2425
2518
2609
2700
W
)
15