Ui Diagnostics - GE CDT865SxJ0 Series Technical Service Manual

UI Diagnostics

Check for 120 VAC entering the machine control. If
no voltage is found, or voltage disappears when
Start button is pressed, a house electrical fault is
suspected.
Check the Service LED on the machine control for a
repair (using the Service LED as a reliable diagnostic
tool).
Blink Pattern Meaning
1x per 3 seconds Dishwasher in not running a
cycle. Select a cycle and press
Start.
2x per 3 seconds Dishwasher is in Delay Start
and waiting to start a cycle.
The cycle will begin once the
delay expires.
3x per 3 seconds Dishwasher is running a cycle.
4x per 3 seconds Dishwasher is paused. Close
the door and press Start to
resume the cycle.
5x per 3 seconds Dishwasher has completed a
cycle and the Clean Light is on
(door has not been opened).
6x per 3 seconds Dishwasher is in Demo Mode.
To exit Demo Mode, press and
hold Start and Heated Dry for
5 seconds.
7X per 3 seconds Current Sense Module is
tripped. See the CSM section of
this guide.
1x per second Communications lost between
control boards. Check
connections, replace UI or MC
as needed.
Flashing rapidly Software error, replace MC.
(4x per second)
Dishwasher is not powered.
Check supply voltage, replace
MC as needed.
Steady On UI personality not set,
communications lost between
UI and MC.
Attempt to enter
the CSM is tripped. Consult On the Main Control
Board CSM section of this service guide to diagnose
and repair.
If the service LED on the machine control has a
door harness and follow the below DCV checks.
For all models, the UI operational voltage is output
from the main control on connector J722 pin 2
black/green to pin 5 yellow/black. If 13.5 VDC is not
found here, replace the main control.
Main Control
13.5 VDC #1 Black/Green
to #2 Yellow/Blue
UI operational voltage is input at the UI control on
connector J401 pin 1 black/green to pin 2 yellow/
blue. If voltage is not found here, but was found
in the previous step, check and replace the door
harness (if needed). If 13.5 VDC is found and the
control does not function in Consumer Error Mode,
replace the UI.
A door harness may become pinched and damaged
within the door or at the tub lip where the harness
exits the inner door assembly. Sleeving may cover
the damaged area and make a visible check not
viable. The harness must be checked by using an
ohm meter and checking continuity of each wire at
each end of the harness at the connectors. Moving
the harness in various directions may be helpful in
diagnosing the harness.
If buttons function properly but the LCD display is
not functional, check for proper voltage at the UI. If
volts are correct, replace the UI.
– 50 –
13.5 VDC #2 Black/Green
to #5 Yellow/Blue