Hall Effect Sensor - Viking RDSOE306SS Service Manual

Service Diagnostics and Procedures

Hall Effect Sensor

The cooling motor incorporates a device called
a Hall Effect Sensor. The sensor is connected to
the relay board. Below you will see the three wire
connectors to the Hall Effect Sensor, which consists
of a black (1), white (2), and red (3) wire. The Hall
Effect Sensor is built into the cooling motor.
To check the cooling fan, verify the cooling fan is
operating. If the fan is not turning, then verify power
is being supplied to the motor. If the fan is running,
locate the 3-wire Molex plug on the relay board. With
the oven switched OFF, unplug the connector from
the board as shown above and set the voltmeter to
DC voltage.
A voltage of +5 volts between the pin (1) black
and pin (3) red should be measured. Measure the
voltage between pin (2) white and pin (3) red and
+5 volts should be measured as well. Measure the
voltage between pin (1) black and pin (2) white and
0 volts should be measured. If the voltages are not
correct and there is 120 volts supplied, replacement
of the relay board is necessary. If the voltages are
correct, reconnect the 3-wire Molex plug. Place
meter leads in pin (1) black and pin (2) white.
© 2012 Viking Preferred Service
Activate the oven so that the fan is energized. With
the fan turning, 2.5 VDC should be measured. If 2.5
VDC is present, then connect meter leads between
pin (2) white and pin (3) red. A voltage of 2.5 VDC
should be measured. If 2.5 VDC is not measured,
but a full 5 VDC is measured, then the Hall Effect
Sensor is defective and replacement of the cooling
fan is necessary.
Another test that can be made is with the oven
shut off and the Molex plug connected, place meter
leads between pin (1) black and pin (2) white. With
the voltmeter set to DC voltage, a reading of 0 or 5
volts should be measured depending on where the
motor is positioned. If the motor is spun manually the
voltage should jump between 0 – 5 volts. The same
is true if the meter leads are placed between pin (2)
white and pin (3) red. As the fan is manually spun a
voltage of 0 to 5 volts will be measured. Therefore,
in any position, one side will read 0 volts while the
other will read 5 volts. This is a good test to see
that the three wire cable and Hall Effect Sensor has
closed contacts.
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