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UI Diagnostics
No display or LED’s will light (excluding model
GDF510)
1. Check for 120 VAC entering the main control. If
no volts are found, check the home breaker.
2. Check the Service LED on the main control for a
and 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.
3. Attempt to enter Consumer Error Mode. If LED’s
light, the CSM is tripped. Consult On the Main
Control Board CSM section of this service guide
to diagnose and repair.
4. Check the door harness connections.
5. For all models except GDF510J, 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,
then replace the main control.
Main Control
13.5 VDC #2 Black/Green
to #5 Yellow/Blue
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.
Page 44
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