Control Board Diagnosis; Line Break Relay; Bake Element - Viking DSOE301SS Service Manual

Service Diagnostics and Procedures

Control Board Diagnosis

With the control board assembly removed, the
following components can be diagnosed without
removal of the components:

Line Break Relay

The line break relay breaks the L2 side of line
voltage. As the relay is energized, the relay closes
and allows L2 to the convection, broil, and bake
element. Locate the line break relay on the control
board. The relay will have a red wire and a yellow
wire connected to it. The red wire is L2 input from
the main power supply and the yellow wire supplies
L2 when the line break relay energizes.
Line Break Relay
When heating is selected by the control input,
voltage is sent to the line break relay coil. A red
LED (D30) in front of the coil verifies coil voltage is
being sent to the relay. This means that 12 VDC is
being sent to the relay coil. It does not indicate that
the relay contacts are closing. To check the relay
contacts, verify input voltage to the relay between
the red wire (L2) and (L1) black at the main terminal
block is 240 VAC.
Select a cooking program. When the relay contact
is closed (D30 LED at base of relay is illuminated
red) 240 VAC should be measured between the
yellow wire and (L1) black. If 0 VAC is measured,
disconnect power and remove the red and yellow
wire off the relay. With power applied, use an Ohm
meter to check for continuity between the two
relay contacts with the relay energized. If infinite
resistance (∞) is measured, this indicates a bad relay
and replacement of the control board is necessary.
© 2010 Viking Preferred Service
Line Break Relay

Bake Element

Locate the P5 connector and the line break relay
on the control board. The P5 connector will have a
Molex plug containing a blue and black wire. The
blue wire goes to the outer bake element and the
black wire is L1 input from the main power supply.
P-5
Line Break Relay
With the power off and the Molex connector
removed from the P5 control board connection, use
an Ohm meter to measure the resistance between
the blue wire in the Molex plug and the yellow
wire from the line break relay. This will measure the
resistance of the outer bake element and a reading
of 23.7 should be measured. If the element fails
Ω
to read resistance, repair or replace bake element
as necessary (see Bake Element Disassembly,
page 55).
P-5
Line Break Relay
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