Control Board Diagnostics; Door Switch; Detergent Dispenser; Circulation Motor - Viking VDB200 Service Manual

Service Diagnostics and Procedures
Control Board Diagnosis
With the control board removed (see Control Board
Disassembly procedure, page 34), the following
components can be diagnosed without removal of
the components:

Door Switch

The door interlock switch controls 12 VDC to the
control board. When the door is open, the contact
opens and the board stops the operation. To check
the switch, unplug the molex connector and check
for continuity between P4-1 (red/white) and P4-2
(yellow). With the door closed, the reading should
be 0 ohms. Open the door and the reading
Ω
should be infinity (∞). If the readings are incorrect,
check the wiring to the door switch and inspect the
door switch.
P-4

Detergent Dispenser

The dishwasher uses a detergent dispenser to
release detergent into the tub. As voltage is
applied, the latch mechanism releases the dispenser
door allowing detergent to enter the tub. Voltage
between P4-1 and P4-4 should be 12 VDC when the
dispenser is activated. If no voltage is measured,
verify wiring.
P-4
Note: Testing the soap cup can be achieved in the
diagnostic mode.
© 2010 Viking Preferred Service
(Some measurements require power and others require the unit not to be powered.)
P-4
P-4

Circulation Motor

The 200 Series Dishwasher uses a single speed,
capacitor assist wash motor. Voltage between P5-1 and
P5-2 should be 120 VAC when the motor is activated.
If voltage is not present, verify wiring. If voltage is
present and the motor is not running, check the
capacitor and motor windings for proper readings.
P-5
Note: Testing the circulation motor can be
achieved in the diagnostic mode.

Fill Valve

The dishwasher uses a fill valve to fill the machine
with water. Verify as the valve is energized 120 VAC
is present between P6-3 and P10-1. If voltage is
present and no water enters, check the water supply
and shut off valve to make sure water is being
supplied to the unit. If water is present, unplug the
wires to the fill valve and using an ohmmeter, check
for approximately 1.1k
Ω
0 ohms are read, replace the fill valve (see Fill
Ω
Valve Disassembly procedure, page 33).
P-6
P-10
Note: Testing the fill valve can be achieved in the
diagnostic mode.
P-5
ohms at the coil. If
P-6
P-10
16