Rtd Sensor; Rtd Characteristics - Viking RDSCE2305B Service Manual

Troubleshooting
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.
22
! WARNING

RTD Characteristics

NOTE: Door switch must be depressed
in order for the convection fan and all
convection cycles to operate when the door
is opened.
©2012 Viking Preferred Service