Bake Relay (Inner And Outer); Broil Element - Viking VDSC548T Series Service Manual

Service Diagnostics and Procedures
Control Board Diagnosis

Bake Relay (Inner and Outer)

When a bake element is selected by the EOC
board, 12 VDC is sent to the bake relay coils. A
red LED in front of each coil verifies coil voltage is
being sent to that particular relay. However, this
does not indicate that the relay is functioning.
When the individual element relays are energized,
(L1-black) power is sent through the relay to the
bake elements. (L1 power is controlled by the line
break relay).
Inner Bake Relay
Select a cooking program. When the inner relay
contact is energized (red LED lit at base of relay)
check for 240 VAC between the yellow wire at the
line break relay and the orange wire on P5.
If 0 VAC is read, disconnect power and remove
P5 Molex plug.
Using your
Ohmmeter, check for
continuity between
the two relay contacts
(refer to photo, right).
When the relay is not
energized, infinite
ohms should be
measured. If 0 Ohms
is found, this indicates a bad relay and the control
board should be replaced.
Outer Bake Relay
Select a cooking program. When the outer relay
contact is energized (red LED lit at base of relay),
check for 240 VAC between the yellow wire at
the line break relay and the blue wire on P5.
If 0 VAC is read, disconnect power and remove
P5 Molex Plug.
Using your
Ohmmeter, check
for continuity
between the two
relay contacts, (refer
to photo, right).
When the relay is not
energized, infinite ohms should be measured.
If 0 Ohms is found, this indicates a bad relay and
the control board should be replaced.
© 2011 Viking Preferred Service
Place meter
leads here
LED
Place meter
leads here
LED

Broil Element

Locate the P6 connector and the line break relay
on the control board. The P6 connector will have a
Molex plug containing a violet, black, and gray wire.
The violet wire goes to the outer broil element, the
black wire is L1 input from main power supply, and
the gray wire goes to the inner broil element.
P-6
With the power off and Molex connector removed
from the P6 control board connection, use an
Ohmmeter to measure resistance between the
violet wire in the Molex plug and the yellow wire at
the line break relay. This will measure the resistance
of
Line Break Relay
the outer broil element and should be
approximately 33 . Likewise, the inner broil
element can be measured by reading resistance
between the gray wire in the Molex plug and the
yellow wire at the line break relay. A resistance
of approximately 30 should be found. If either
element fails to read resistance, remove the
element to repair or replace (see Broil Element,
page 111).
P-6
Line Break Relay
75