Control Board Diagnosis; Line Break Relay; Bake Element - Viking vdsc530t Service Manual

Service Diagnostics and Procedures

Control Board Diagnosis

With the control board assembly removed (see
page 65), 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 line break relay energizes.
Line Break Relay
When heating is selected by the control input,
12 VDC is sent to the Line break relay coil. A red
LED in front of the coil verifies coil voltage is being
sent to the relay. This does not indicate however
that the relay is functioning.
To check the relay contacts, verify input voltage to
the relay between the red wire (L2) and (L1) black at
the main terminal block. You should read 240 VAC.
Select a cooking program. When the relay contact
is closed (red LED lit at base of relay) check for
240 VAC between the yellow wire and (L1) black.
If 0 VAC is read, disconnect power and remove
the red and yellow wire off the relay. Reconnect
power and using your Ohm meter to check for
continuity between the two relay contacts when the
relay is energized. If you read infinite ohms (∞), this
indicates a bad relay and you will need to replace
the control board.
© 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, black, and orange wire.
The blue wire goes to the outer bake element, the
orange wire goes to the inner 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 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 should
be approximately 38 . Likewise, the inner bake
Ω
element can be measured by reading resistance
between the orange black wire in the Molex plug
and the yellow wire from the line break relay. A
resistance reading of approximately 38
be found. If either element fails to read resistance,
remove element to repair or replace (follow bake
element disassembly procedure).
P-5
Line Break Relay
should
Ω
38