To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
WARNING
!
Control Board Diagnosis
With the control board assembly accessed
(see page 33), 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 power to the
convection, broil, and bake elements. 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. The yellow wire is L2
output from the line break relay.
When heating is selected by the control input,
voltage 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 black wire (L1) at the connector P12. 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 black (L1). If 0 VAC is read, disconnect
power and remove the red and yellow wires
off the relay. Reconnect power and using
your ohmeter to check for continuity between
the two relay contacts when the relay is
energized. If you read infinite ohms (∞), this
indicates a faulty relay and you will need to
replace the control board.
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.
Blue Wire
Black Wire
Orange Wire
With the power off and the Molex connector
removed from the P5 control board
connection, use an ohmeter to measure
resistance between the blue wire in the
Troubleshooting
©2012 Viking Preferred Service
11
Содержание RDSCE230-5B
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