Convection Relay; Cooling Fan - Viking vdsc530t Service Manual

Service Diagnostics and Procedures
Control Board Diagnosis

Convection Relay

When the convection element is selected by the
EOC board, 12 VDC is sent to the convection
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 convection element relay
is energized, (L1-black) power is sent through
the relay to the convection element. (L1 power is
controlled by the line break relay).
To test, select a cooking program. When the
convection 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 white/
red wire on P2. If 0 VAC is read, disconnect power
and remove P2 Molex plug.
Reconnect power and
using your Ohm meter,
check for continuity
between the two
relay contacts (refer to
photo). When the relay
is energized; if you read
infinite ohms (∞) this
indicates a bad relay and
you will need to replace
the control board. If you read 0 ohms, the relay
contact is closing.
© 2010 Viking Preferred Service
Place meter
leads here
LED

Cooling Fan

Locate the P11 connector on the control board.
The P11 connector will have a Molex plug
containing white/black wires.
P-11
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
resistance is read, remove fan to repair/replace
(follow cooling fan disassembly procedure).
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 (follow cooling fan
disassembly procedure). If no voltage is present,
verify wiring. If wiring is OK, check the relay on the
EOC board.
P-11
. If no
Ω
41