Relay Board Diagnosis - Viking RDSOE306SS Service Manual

Service Diagnostics and Procedures

Relay Board Diagnosis

Convection Relay
When the convection element is selected, voltage
is sent to the convection relay coils. A red LED (D26)
in front of each coil 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 convection
element relay is energized, power (L1-black) is sent
through the relay to the convection element. Power
(L2-red) is supplied by the line break relay).
To test, select a cooking program. When the
convection relay contact is energized (D26 at base
of relay illuminates red), check for 240 VAC between
the yellow wire at the line break relay and the white/
red wire on P2. If 0 VAC is measured, disconnect
power and remove P2 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 you will need
to replace the relay
board. If 0 ohms are measured, the relay contact is
closing.
© 2012 Viking Preferred Service
Cooling Fan
Locate the P11 connector on the relay board. The
P11 connector will have a Molex plug containing
white/black wires.
With the Molex connector removed from the P11
board connection, use an Ohm meter to measure
resistance between one of the white/black wires
and neutral at P1 on the power supply board.
The resistance should be approximately 18
no resistance is measured, remove fan to repair
or replace as necessary (see Oven Cooling Fan
Disassembly).
With the Molex connector attached to the P11 board
connection, use a voltmeter to measure voltage
between the white/black wire of the Molex plug and
the white wire in the Molex plug at the P1 power
supply board. The voltage should be
120 VAC. If 120 VAC is present and no fan rotation,
replace the cooling fan (see Oven Cooling Fan
Disassembly). If no voltage is present, verify wiring.
If wiring is OK, check the relay on the relay board.
. If
Ω
30