Bosch WFK 2401 Service Bulletin

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This will show how to use and interpret the
To enter test program for WFK 2401 washers:
♦
Set cycle knob to any "X" (reset) position
♦
Press and hold Pre-Wash and Start buttons at the same time. While still holding Pre-Wash and Start
buttons, turn unit on by pressing On/Off button.
♦
Keep holding Pre-Wash and Start buttons (only) until digital display comes on (~ 5 seconds).
♦
When test program has been entered:
♦
Start light will flash
♦
Digital display will show 00 for no faults or will show fault codes below:
HINT: Fault codes customers could
see during normal washing:
D
01 = No water filling
D
02 = No heating
D
03 = No draining
D
04 = Overheating
D
06 = Door open or won't lock
Test # 1 -- Motor & drain pump:
Rotate cycle selector knob to Regular/Cotton (1), then push Start button. Test ends automatically after ~ 3
minutes.
♦
Start light flashes when test has been selected, stays on when test has started and flashes when test has ended.
♦
During test, motor turns drum clockwise for 5 seconds (@ 50 RPM), then counterclockwise for 5 seconds. Drain
pump comes on while motor turns drum clockwise @ 100 RPM for 30 seconds (to test if drum unbalanced), gradually
accelerates to top speed, slows and stops.
Test # 2 -- Hot & dual cold water valves, pressure switch, heater & drain pump:
Rotate cycle selector knob to Regular/Cotton (2), then push Start button. Test ends automatically after ~ 3-
1/2 minutes.
♦
Start light flashes when test has been selected, stays on when test has started and flashes when test has ended.
♦
Display shows 00 at start of test. In left side of dispenser, hot water pulses for 12 seconds, then flows for 15
seconds. Then, cold water flows into right side of dispenser for 10 seconds. Display shows 01 when pressure switch
trips, then water fills, heater comes on (drawing 6.5 A) and motor occasionally turns drum clockwise &
counterclockwise. Water fills totally until display shows 02 (~ 1-1/2 minutes), then drain pump comes on (and motor
and heater shut off). While washer drains, display goes from 02 to 01 to 00.
NOTE:
During test # 2,
display shows fault code 01
since water doesn't totally
fill & 02 since water isn't
fully heated. This is normal.
1st Edition/Rev. 2
Service Bulletin

Using WFK 2401 Washer Test Program

HINT: Fault codes displayed during testing:
D
01 = No water filling
D
02 = No heating
D
03 = No draining
D
04 = Overheating
D
05 = Motor erratic
HINT: Water valves are tested in order:
•
•
•
B
WFK 2401 washer test program.
HINT: Turning washer off at any time will end test program.
D
D
D
D
D
Hot water valve – pulses & flows into left side of dispenser.
Left side of cold water valve (Pre-wash) – flows into right
side of dispenser.
Left & right sides of cold water valve (Wash) – flows into left
side & center of dispenser.
06 = Door open or won't lock
08 = Motor won't run
09 = NTC failed (open circuited)
10 = NTC failed (shorted)
12 = Motor reversing relays
failed
Wednesday, February 6, 2002