For Service Technician Use Only
COMPONENT TESTING
(
Cont.
)
3-10
n
Whirlpool
®
24" Compact Condensing Dryer
7.
Measure the voltage across pins CN14 - 4 (GND) and
CN14 - 3. It should read 5 V.
8.
Access the drain system cover by removing the left side
panel and the pump cover; verify that the drain hose
connections are OK, and that the drain harness (line to
line connection) and water level sensor harness (line to
line connection) are connected to the drain system. Check
pump cover and water level sensor pocket for evidence of
water. If there is water in the pocket or the sensor appears
to be damaged. Please replace the sensor following these
steps:
•
Drain the water from the sump by removing the pump
cover and sucking up all of the water. Dry it as best as
possible.
•
Install pump cover back, and remove the sensor wire
and holder.
• Install new sensor and connector.
•
Re-attach hoses and put machine back together.
•
Plug in or reconnect power.
•
Power machine up, this calibrates the sensor.
Check the continuity of the harness. If there are
connectivity and continuity issues, replace the harness and
verify that the “water tank full” indicator is off and that the
pump is active in Service Test Cycle step S04.
9.
If everything is connected and the drain pump still does not
drain water from the sump, measure the resistance across
pins 1 and 2; the resistance should be approx. 210 Ω. If the
reading is infinite (open), replace the drain pump.
10.
If the preceding steps did not correct the problem, replace
the ACU.
Test #9: Secondary Lint Filter Switch
This is a test to perform when the “Check bottom filter” error is
displayed, and the machine will not operate.
1.
Open the cover to access the bottom filter.
2.
Verify that the release levers are in place and in good
condition to hold the bottom filter in place.
3.
Remove the filter and make sure that it is not blocked by
lint.
4.
Put the filter back in place and make sure that the release
levers are securely holding it.
5.
If the icon is still lit, remove the top panel and console to
access the machine electronics. Remove the left side panel
to access the reed switch connection.
6.
Verify continuity between CN15-3 and CN15-4: When the
filter is removed, there should be high resistance (open
contact); when the filter is in place, there should be low
resistance (closed contact). If not, replace the harness.
NOTE:
The harness includes the reed switch and the water
level switch.
7.
If the failure persists after replacing the harness, replace
the ACU.
Test #10: Communication Between HMI
and ACU
This is a test to perform when the HMI turns on and the button
LEDs flash, but does not display the cycles and options and will
not turn off.
1.
Remove top panel, left side panel, and console to access
the machine electronics.
2.
Verify that the harness is in good condition and check the
HMI and CN13 connections; check for continuity. If no
continuity, replace the harness.
3.
If the problem persists, replace the ACU.
4.
If the problem persists, replace the HMI.
