© 2011 Viking Preferred Service
76
Service Diagnostics and Procedures
Control Board Diagnosis
Broil Relay (Inner and Outer)
When a broil element is selected by the EOC board,
12 VDC is sent to the broil relay coils. A red LED
in front of each coil verifies coil voltage is being
sent to that particular relay. This does not indicate
however that the relay is functioning. When the
individual element relays are energized,
(L1-black) power is sent through the relay to the
broil elements. (L1 power is controlled by the
line break relay).
Inner Broil 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 gray wire on P6. If 0 VAC
is read, disconnect power and remove the P6
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 Broil 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 violet wire on P6. If 0 VAC is
read, disconnect power and remove P6 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.
Convection Element
Locate the P2 connector and the line break relay on
control board. The P2 connector will have a Molex
plug containing a white/red and black wire. The
white/red wire goes to the convection element and
the black wire is L1 input from main power supply.
With the power off and Molex connector removed
from the P2 control board connection, use an
Ohmmeter to measure resistance between the
white/red wire in the Molex plug and the yellow
wire at the line break relay. This will measure the
resistance of the convection element and should
be approximately 18
ї
. If the element fails to read
resistance, remove element to repair/replace
(see Convection Element, page 110)
.
P-2
P-2
Line Break Relay
Line Break Relay
LED
Place meter
leads here
LED
Place meter
leads here
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