Left Oven Cooling Fan-Vdsc548T; Hall Effect Sensor - Viking VDSC548T Series Service Manual

Service Diagnostics and Procedures–Disassembly
To avoid risk of electrical shock, personal injury, or death, disconnect electrical power to unit using power
switch before servicing. Wires removed during disassembly must be replaced on proper terminals to insure
correct earth ground and polarization. After servicing, reconnect power using power switch.
Left Oven Cooling Fan–VDSC548T
The VDSC is designed to circulate air around the
burner box area whenever the oven is switched on.
The oven cooling fan has a Hall Effect sensor that
monitors the fan and communicates information to
the control board.
To access oven cooling fan:
1. Remove main back cover (see Main Back
Access section, pages 114-116).
2. Remove screws securing cooling fan.
Cooling Fan
Screws
3. Slide fan out, disconnect wiring to fan motor,
and wiring to Hall Effect Sensor.
4. Repair/replace as necessary.
5. Reverse procedure to reinstall.
© 2011 Viking Preferred Service
WARNING
Connections

Hall Effect Sensor

The cooling motor incorporates a device called a
Hall Effect Senor. The sensor is connected to the
main control board. Below you see the three wire
connectors to the Hall Effect Sensor, which consists
of black (1), white (2) and red (3) wires. The Hall
Effect Sensor is built into the cooling motor.
If you receive a COOLING FAN ERROR alert, the
first thing to do is to access the diagnostics and
see if the cooling fan is operating. If the fan is not
turning, then check to see if there is power going
to the motor (as shown on page 79). If the fan is
running, locate the three-wire Molex plug on the
EOC. With the oven switched OFF, unplug the
connector from the board as shown above and set
your volt meter to DC voltage.
You should read +5 volts between the pin (1) wire
and pin (3) wire. You will also read +5 volts between
the pin (2) wire and pin (3) wire. You should read
0 volts between pin (1) and pin (2). If the voltages
are not correct and there is 120-volts supplied to
the board, replace the EOC.
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