Viking VDB325 - Component Diagnosis - Door and Dispenser; Door Switch and Detergent Dispenser Diagnosis

© 2011 Viking Preferred Service
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Service Diagnostics and Procedures
Control Board Diagnosis The diagnostic program on the 325 and 450 (when activated) will run all the
components and compare the test results to the stored readings in memory. If the results are incorrect, an error
code will be displayed. Suggest running the diagnostics program on pages 14-15 before removing unit
for testing. ( Some measurements require power and others require the unit not to be powered.)
With the unit removed from the cabinet and lying
on its side, remove the bottom base pan to gain
access to the machine controller. (see page 47 for
removal of board).
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 їohms. Open the door and the reading
should be infi nity (). If the readings are incorrect,
check the wiring to the door switch and inspect
the door switch.
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 P4-2 should be 12 VDC when the
dispenser is activated. If no voltage is measured,
verify wiring.
Note: Testing the soap cup can be achieved
in the diagnostic mode.
.
Door Switch
P-4
Main Control Board
Detergent Dispenser
P-4
Main Control Board