Turbidity Sensor; Factory Test Mode - GE Profile PDW8200 Series Technical Service Manual

Factory test mode is the most accurate way to test the turbidity sensor circuit (circuit contains control
module, wiring, and turbidity sensor). Factory test mode will test the thermistor (used for automatic
temperature control) that is contained in the turbidity sensor and will test the transmitter that is
contained in the turbidity sensor.
Entering Factory Test Mode
Note: This mode can only be entered within the first 2 minutes after power-up. After 2 minutes, factory
test mode is unavailable.
1. Disconnect power from dishwasher. Wait 10 seconds and connect power to dishwasher.
2. Press the NORMAL WASH keypad and POTS & PANS (or COOK WARE) keypad at the same time for
5 seconds (This step must be performed within 2 minutes of power-up).
3. The following sequence should occur:
a. All LEDs illuminate for a short period of time.
b. Water valve activates. The dishwasher will fill for the appropriate amount of time.
c. Circulation pump activates. The dishwasher will circulate for approximately 1 minute.
d. Turbidity sensor check. The control module will check the thermistor circuit, the turbidity
(transmitter) circuit, and calibrate itself to the turbidity sensor (transmitter). The turbidity sensor
check lasts for 20 to 30 seconds.
1). If the turbidity sensor check fails, the control module will beep continuously and the lock LED
will be illuminated. The control module, wiring, and turbidity sensor are suspect if the turbidity
sensor check fails. Press any keypad to stop the control module beeping and move to the next
step in the factory test mode sequence.
2). If the turbidity sensor check passes, the control module will automatically move to the next step
in the factory test mode sequence.
e. Drain pump activates. Allow the dishwasher to pump out all water (approximately 75 seconds).
After the water has been pumped out, the dishwasher will begin to fill again. Press the START/
RESET keypad while the dishwasher is filling. The dishwasher will then pump out for approxi-
mately 2 minutes and then return to normal operation. The dishwasher will automatically exit fac-
tory test mode 1 hour and 10 minutes after the test was initiated if the START/RESET keypad is not
pressed to exit.

Factory Test Mode

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