Dishwasher Service Manual
91
Troubleshooting and Repair
CONTROLLER FAILURE CODES
FAULT
CAUSE
EFFECT
SOLUTION
Drain
Pressure Switch is in
the closed position
after two full drain
procedures
Three long beeps, red light
flashes below door.
Press Cancel key twice to re-
set this fault. Fault will occur
again in the first Drain if the
conditions are still true. See
component diagnosis section
for troubleshooting.
Water in
Base Pan
Floor Guard switches
to a open position
caused by a flood con
-
dition in the base
Cycle will stop, followed by
three long beeps. Drain pump
will activate until the floor
-
guard switch is reset. Floor-
guard LED will turn ON and
red light will stay steady below
door.
Floorguard switch will reset
and clear this fault, when
water is removed from the
base pan.
F3
Controller failure to
communicate with the
Atmel 16 on the power
board. The dishwasher
loads will not function.
A fault can be visible in the
first 15 seconds of initial pow
-
er-up. “F3” will flash on the
display and will be visible to
the user. Dishwasher will be
disabled.
Check Control and Power
Board Compatibility. Check
power/controller board com-
munication cable.
F4
No response signal
from the WPS
Wash cycle will go into a
default timetable and soil=3;
temp=0. F-4 appears for the
failure test mode.
Check WPS connection. Re-
place WPS
F5
Controller failure to
communicate with PIC
or no PIC software in
the power board PIC
Microcontroller
There is no temp or soil infor-
mation reported to the control-
ler.
Controller will default to soil=2
& temp=0. F-5 appears in the
ailure test mode.
Replace power board.
F9
Heater failure
Temperature does not increase See component diagnosis
section for troubleshooting.
(Table 2)
NOTE: There will never be an F4 and F5 error at the same time.
