Control Board Test Points - Viking FDB451 Service Manual

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.

Control Board Test Points

The unit has a control board that controls the functions of the dishwasher. Components can be
diagnosed via the control board. With the control board accessed (see Control Board Disassem-
bly procedure, Page 31), the following can be measured:
P8 Moisture
sensor / Tem-
perature sensor
P4 Door switch,
Dispenser
Component
Door Switch
Dispenser
Wash Motor
Water Valve
Drain Pump
Diverter
Moisture Sensor
Temperature Sensor
Water Heater
©2012 Viking Preferred Service
!
P9 User Inter-
face Port
Control Board Test Point
P4-1 (Yellow) – P4-2 (RD/WH)
P4-1 – P4-4
P5-1 (Red) – P5-2 (White)
P6-3 (Blue) – P10-1 (White)
P6-4 (Brown) – P10-1 (White)
P6-2 (Gray) – P10-1 (White)
P8-1 (Red/White) – P8-2 (Purple)
P8-3 (Black/White) – P8-4 (Blue)
P12 (Gray) – P10-1 (White)
WARNING
P12 Water
Heater
Troubleshooting
P6 Water valve,
Drain pump,
Diverter
P10
Circulation
Water valve,
Drain pump
Readings (Typical)
0 Ω door closed
∞
Ω door open
8.3 Ω
6.3 Ω
1.1K Ω
15.1 Ω
2.7K Ω
175K Ω
47K Ω @ 77˚ (varies based on temp)
12.00 Ω
P5
Motor
35