TKA 9110 UC Coffeemaker Training Program Bosch Dryer WTA35 WTL54

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50

WTA/WTL Service Tips -- Test Program (1)
WTA 35 & WTL 54 dryers have test programs enabling them to selfdiagnose problems, including listing the last fault code.
To enter/exit test program for WTA 35 & WTL 54 dryers:
♦ Rotate Auto-cycle and Timed cycle knobs to Off position.
♦ Push and hold Start and Delicate buttons at the same time, then turn dryer on by pushing On/Off button. After pushing
On/Off button, keep holding Start and Delicate buttons until Start light flashes rapidly. Dryer is now in the test program.
♦ Lights will flash for drying faults -- fault shown will be the last fault code on the dryer (see fault chart on next page).
♦ When test program has been entered:
♦ Start light flashes rapidly.
♦ Select individual parts to test by rotating Auto-cycle knob as shown on next page.
♦ Don’t rotate Auto-cycle knob or push any button while individual tests are being run (so tests won’t stop).
♦ Once part to test has been selected, start test by pushing Start button. Start light will stay on continually while tests
are running. Push Start button again to end any test. Tests have finished once Start light flashes rapidly again.
♦ To exit test program, push Start button (while Start light flashes rapidly).

NOTE: Fault displayed
will be 1st fault that
occurred since last time
dryer was turned on.
Timed cycle
knob

Auto-cycle
knob

1st Edition/Revision 2 (1/27/03)

51

WTA/WTL Service Tips -- Test Program (2)
Test parts individually as follows:
♦ Indicating lights & digital display – To start test, rotate Auto-cycle knob to Regular/Cotton Extra Dry, then push Start button. To
end test, rotate Auto-cycle knob out of Regular/Cotton Extra Dry position.

Cycle buttons & selector switches – To start test, rotate Auto-cycle knob to Regular/Cotton Very Dry, then push Start button. To
end test, push Start button again (since test doesn’t end).

♦ Pump, motor, heater & NTC’s – To start test, rotate Auto-cycle knob to Regular/Cotton Regular Dry, then push Start button. Test
ends automatically.

♦ Sensor conductance – To start test, rotate Auto-cycle knob to Regular/Cotton Light Dry, then push Start button. To end test, push
Start button again (since test doesn’t end).

Fault
Drying time too long

Possible Causes

Flashing Lights
Anti-Crease/
End

‰
‰

Control module failed.
Moisture sensor(s) failed.
Hi-Limit (“overheat”) thermostat tripped and failed to
reset.
Water level switch failed (WTL 54 only).
Supply voltage too low.

Overheating

‰
‰

Control module failed.
Heater failed.

Extra Dry

R3 NTC failed (short or open circuited)

‰

NTC # R3 failed.

Damp Dry

R2 NTC failed (short or open circuited)

‰

NTC # R2 failed.

Regular Dry

Condensed water not pumped out
(WTL 54 condensation models only)

‰

Pump failed.

‰
‰
‰

Digital Display

E1
1st Edition/Revision 2 (1/27/03)

52

WTA/WTL Service Tips -- Test Program (3)
SELECTOR
KNOB

KNOB PROGRAMS

KNOB
POSITION

LIGHTS
Drying

Program
Selector
Knob

Off

NOTE: Red
Regular/
Cotton Very
Dry lights stay
lit during this
test no matter
what program
selector
position is
chosen – no
other Regular/
Cotton or
Permanent
Press lights
comes on.

Regular/Cotton Very Dry

Timed Cycle
Knob
NOTE:
program
selector knob
MUST be
straight up for
tests to run.

Regular/Cotton Extra Dry

Damp
Dry

Regular
Dry

Extra
Dry

AntiCrease/End

On
On

Regular/Cotton Regular Dry

NOTES:
On

Regular/Cotton Light Dry

•

Pushing "START" button
after test has ended will
repeat it.

•

Door can be opened (if
desired) during this test.

•

Delicates, End of Cycle
Signal and Cycle Time
Minutes
lights stay lit
whenever button underneath
them is pushed and held.
Digital display does not
come on during this test.

On

Regular/Cotton Econo Dry

On

Regular/Cotton Damp Dry

On

Permanent Press Econo Dry

On

Permanent Press Light Dry

On

Permanent Press Regular Dry

On

On
On
On
On

Permanent Press Very Dry

On

Permanent Press Extra Dry

On

Timed cycle Heated Dry

On

•

On
On
On

Timed cycle

On

Timed cycle

On

Timed cycle Air Fluff

Cycle Buttons &
Selector
Switches Test
Chart

On
On
On

On

1st Edition/Revision 2 (1/27/03)

53

WTA/WTL Service Tips -- Test Program (4)
Pump, motor, heater & NTC’s Test Sequence Chart
PART
TESTED

TEST ORDER & TIME (SECONDS)
START

15
3

Pump

5

5
5

2

2

5

29

NOTES
END

5 1 5 1 5 1 5 1 5

START
OF
TEST

Motor –
right
rotation
Motor –
off
Motor –
left
rotation

END
OF
TEST

For WTL 54
condensation
dryer only
During 29
second drum
reversing cycle,
drum runs for 5
seconds on / 1
second off –
check drum
rotation with
door open.

Heater
(E2)

Feel for heat
with door open.

Heater
(E3)

Feel for heat
with door open.

NOTES:
• Test
ends
automatically.
Pushing Start
button after test
has ended will
repeat it.
• Opening
door
stops test –
closing
door
resumes
test.
To
check if
drum is turning
and if heat is
coming out of
drum, run test
with door open
by tripping door
latch (by gently
pushing it with a
screwdriver).

To exit test program (from any test), turn unit off by pressing "ON/OFF" button.
1st Edition/Revision 2 (1/27/03)

54

WTA/WTL Service Tips -- Test Program (5)
Sensor Conductance Test
HINTS:
• Tests can be run with door closed. Opening door during testing stops the test.
• To run 2nd test with sensors and drum connected, remove top panel and connect jumper
to copper braids (for two "brushes" touching outside of drum).
• Drum must be empty during these tests – damp clothes in drum will give wrong results.
• Lights won't flash during this test.

To exit test program (from
any test), turn unit off by
pressing "ON/OFF" button.

LIGHTS SHOWING CONDUCTANCE OF MOISTURE SENSORS
Test

"Drying" light

"Damp Dry" light

Comments

Drying

Damp Dry

No fault

Drying

Damp Dry

Fault – short circuit

Drum empty – with sensors and drum connected

Drying

Damp Dry

No fault

HINT: Remove top panel and jumper between copper

Drying

Damp Dry

Fault – open circuit or
circuit resistance is too high

Drum empty –sensors and drum not connected

braids (to "brushes" touching outside of drum).

HINT: Using the test program can cut down repair
times & eliminate repeat calls from misdiagnosing
problems. The pump, motor, heaters, NTC’s and
moisture sensor conductance tests are more helpful
than the buttons, knobs, lights and display tests.

1st Edition/Revision 2 (1/27/03)



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Title                           : TKA 9110 UC  Coffeemaker Training Program
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