Diagnostics
© 2008 Viking Preferred Service
48
Hall Effect Sensor
As shown on the previous page, the cooling motor incorporates a device called a Hall Effect Senor.
The sensor is connected to the main Control board. In Fig A below you see the three wire connector to the hall
sensor, which consists of a Red (1), White (2) and Black (3) wires. There is also a separate connection for the
lower Hall Effect sensor on all Double oven models. PU4 is for the upper and PL4 is for the Lower.
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 44). If the fan is running, locate the 3 wire Molex plug on the Main Control Board. With the oven
Switched OFF, Unplug the connector from the board as shown in FIG B and set your Volt meter to DC Voltage.
You should read +5 Volts between the Pin (1) wire and Pin (2) wire. You will also read +5 Volts between the Pin
(1) wire and Pin (3) wire. You should read 0 volts between Pin (2) and Pin (3). If the voltages are not correct,
replace the Main Control Board.
If the voltages are correct, reconnect the 3-Wire Molex Plug. Place your Meter leads into Pin (1) RED and Pin
(2) white. Activate the oven or the Diagnostic Program so that the fan is energized. With the fan turning, you
should be reading 2.5 Volts DC. If yes, then connect your meter between Pin (2) White and Pin (3) Black. Again
you should read 2.5 volts DC. If you do not read 2.5 volts but a full 5 volts DC, then the Hall Sensor is defective
and the fan motor (with S\sensor) will need to be replaced.
Another test that can be made is with the oven shut off and the Molex plug connected, place your Meter leads
into Pin (1) Red and Pin (2) White. Set your Meter to DC Volts. You will read either 0 or 5 volts, depending on
where the motor is positioned. If you manually spin the motor you will see the meter jump between 0-5 volts.
The same is true if you were to place your meter leads in Pin (2) White and Pin (3) Black.
As you manually spin the fan you will see 0 or 5 volts. Therefore, in any position, one side will read 0 volts while
the other will read 5 volts.
RTD Sensor
1 2 3
1 2 3
PU4
Summary of Contents for Designer DEDO530T
Page 31: ...Diagnostics 2008 Viking Preferred Service 31...
Page 32: ...Diagnostics 2008 Viking Preferred Service 32 Broil cycle chart TruConvec cycle chart...
Page 33: ...Diagnostics 2008 Viking Preferred Service 33 NOTE Convection fan is running at LOW speed...
Page 37: ...Diagnostics 2008 Viking Preferred Service 37...
Page 71: ...Wiring and Schematics 2008 Viking Preferred Service 71...
Page 72: ...Wiring and Schematics 2008 Viking Preferred Service 72...
Page 73: ...Wiring and Schematics 2008 Viking Preferred Service 73...
