© 2010 Viking Preferred Service
39
Service Diagnostics and Procedures
Relay Board Diagnosis
Broil Relay (Inner and Outer)
When a broil element is selected, voltage is sent
to the broil relay coils. A red LED (D19 and D20) in
front of the respective relay verifies coil voltage is
being sent to that particular relay. This means that
12 VDC is being sent to the relay coil. It does not
indicate that the relay contacts are closing. When
the individual element relays are energized, power
(L1-black) is sent through the relay to the broil
elements. Power (L2-red) is supplied from the line
break relay.
Inner Broil Relay
Select a cooking program. When the inner relay
contact is energized, (D20 LED at base of relay
illuminates red), check for 240 VAC between the
yellow wire at the line break relay and the violet
wire on P6. If 0 VAC is measured, disconnect power
and remove the P6 Molex plug.
Reconnect power
and using an
Ohmmeter, check for
continuity between
the two relay
contacts. When the
relay is energized;
if you read infinite
ohms (
ї
) this
indicates a bad relay
and replacement
of the relay board is necessary. If 0 ohms are
measured, the relay contact is closing.
Outer Broil Relay
Select a cooking program. When the outer relay
contact is energized (D21 LED at base of relay
illuminates red),
check for 240 VAC
between the yellow
wire at the line
break relay and the
gray wire on P6. If
0 VAC is measured,
disconnect power
and remove P6
Molex plug.
Reconnect power
and using an
Ohmmeter, check for continuity between the two
relay contacts. When the relay is energized; if
infinite ohms (
ї
) are measured this indicates a
bad relay and replacement of the relay board is
necessary. If 0 ohms are measured, the relay contact
is closing.
Convection Element
Locate the P7 connector and the line break relay
on relay board. The P7 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 relay 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 34.4
ї
. If the element fails to read
resistance, remove element to repair or replace as
necessary
(see Convection Element Disassembly,
page 58)
.
Place meter
leads here
P-7
LED
Place meter
leads here
LED
Place meter
leads here
Line Break Relay
Line Break Relay
