© 2012 Viking Preferred Service
29
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 (D25 and D27) 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 (D25 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 Ohm meter,
check for continuity
between the two
relay contacts.
When the relay is
energized; if you read
infinite ohms (
Ω
) 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 (D27 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 Ohm
meter, check for continuity between the two relay
contacts. When the relay is energized; if infinite
ohms (
Ω
) 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 P2 connector and the line break relay
on relay 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 relay board connection, use an Ohm
meter 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
Ω
. If the element fails to read resistance,
remove element to repair or replace as necessary
(see Convection Element Disassembly)
.
