For Service Technician Use Only
COMPONENT TESTING
(
Cont.
)
3-8
n
Whirlpool
®
24" Compact Condensing Dryer
n
If the resistance is OK, the outlet thermistor is good.
Proceed to step 4.
n
If the thermistor resistance does not agree with the
table, replace the heater module and test again.
4.
Check CN15 - 6 and CN15 - 2 to dryer cabinet ground. If
either pin indicates continuity to ground (short), replace
wiring harness; otherwise, proceed to step 5.
5.
If the preceding steps did not correct the problem, replace
the ACU.
NTC Air Channel (Condenser Dryer)
NOTE:
Begin with an empty dryer at ambient temperature and a
clean lint screen.
1.
Unplug dryer or disconnect power.
2.
Remove top panel, left side panel, and console to access
the machine electronics.
3.
Remove connector CN15 from the ACU and measure the
resistance between CN15 - 1 and CN15 - 2 at the connector.
The following table gives temperatures and their associated
resistance values.
NOTE:
All thermistor resistance measurements must be
made while dryer is unplugged and connector removed
from ACU.
n
If the resistance is OK, the compressor thermistor is
good. Proceed to step 4.
n
If the thermistor resistance does not agree with the
table, replace the compressor thermistor.
Compressor Thermistor Resistance (Heat Pump Dryer)
and
NTC Air Channel Resistance (Condenser Dryer)
Temperature
°F (°C)
Resistance
k ohms
Resistance Tolerance
(%)
32° (0°)
35.975
± 5.8
86° (30°)
9.786
± 3.7
104° (40°)
6.653
± 3.1
122° (50°)
4.608
± 2.6
140° (60°)
3.243
± 2.0
158° (70°)
2.332
± 2.5
203° (95°)
1.093
± 3.7
4.
Check CN15 - 1 or CN15 - 2 to dryer cabinet ground. If
either pin indicates continuity to ground (short), replace
wiring harness; otherwise, proceed to step 5.
5.
If the preceding steps did not correct the problem, replace
the ACU.
Test #5: Moisture Sensor
This test is performed when an automatic cycle stops too soon,
or runs much longer than expected.
NOTE:
Dryer will shut down automatically after 4 hours and 40
minutes. The following items are part of this system:
Part of Moisture System
Electric Dryer
Harness/connection
Metal sensor strip
Machine control electronics
1.
Unplug dryer or disconnect power.
2.
Remove top panel, left side panel, and console to access
the machine electronics.
3.
Access moisture sensor inside front of drum to verify
continuity between moisture sensor in drum and CN1 on
ACU.
NOTE:
You may need to clean sensor strip in drum before
testing.
n
Verify continuity between CN2 (green/yellow wire) pin
on ACU and ground screw on cabinet.
n
If continuity is found in the steps above, proceed to
step 5. If no continuity, proceed to step 4.
4.
Remove front panel and check CN1 wire connection to
moisture sensor in drum (connector is located below the
door opening between the front panel and bulkhead) and
wire connection to sensor. If still no continuity replace the
main harness.
5.
Reassemble all parts and panels.
6.
Plug in dryer or reconnect power.
7.
Run the moisture sensor diagnostic test (Service Test Cycle
). If the moisture sensor diagnostic
test passes (no F03 error code), check the outlet thermistor:
see Test #4b,
.
n
If the problem persists after replacing the moisture
sensor and thermistor, consider adjusting the dryness
level.
8.
If the preceding steps did not correct the problem, replace
the ACU.
