Factory Test Mode - GE EDW4000 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 con-
tained 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.
• If the turbidity sensor check fails, the control

Factory Test Mode

e. Drain pump activates. Allow the dishwasher
– 26 –
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.
• If the turbidity sensor check passes, the
control module will automatically move to
the next step in the factory test mode
sequence.
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 approximately 2 minutes and
then return to normal operation. The
dishwasher will automatically exit factory test
mode 1 hour and 10 minutes after the test
was initiated if the START/RESET keypad is
not pressed to exit.