Diagnosing Electronic Control Boards; Main Control Diagnostics - GE CDT865SxJ0 Series Technical Service Manual

Diagnosing Electronic Control Boards

Diagnosing the main control and UI control are
covered in this section. Many components can
be checked from the main control, which can be
accessed with the door on or removed, if needed.
Some connectors are located through the bottom
cover to allow easy access to AC supply connector,
door harness and RJ45 connector.
WARNING: GE Factory Service Technicians are
REQUIRED to follow Lockout / Tagout (LOTO) 6
Step Process prior to beginning repair.
Single Speed Motor Main Control
Service
DC Power
LED
Connector
Drain & Circ. Connector
AC Power Connector (backside of board)
Variable Speed Motor Main Control
DC Power Connectors
Heat
Personality
Connector
Jumper
Service LED
– 48 –

Main Control Diagnostics

Diagnostics are aided with the addition of a green
Service LED on the machine control board that
indicates the status of the control board. To view the
LED, disconnect power and place the main control
in service position (under To Access Main Control
Board, found on the next page), then repower the
dishwasher to view the Service LED.
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.
(Continued next page)