Test #3: Motor Circuit - Whirlpool WED99HEDW0 Technical Education

Canadian Installations:
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the top right corner of the
back of the dryer. See figure 1.
3. Access the machine electronics without disconnecting any
wiring to the CCU.
4. With an ohmmeter, check the continuity from L1 and N
plug terminals of the power cord to the terminals for L1
and N on the CCU. See figure 3.
¾ If continuity exists for both connections, go to step 6.
¾ If an open circuit is found, check the integrity of the
connections of the power cord to the harness in the
dryer; harness to the CCU; and the integrity of the
power cord itself.
Power Cord
Plug
N Neu
L1
COM
Figure 3 - Plug-to-terminal connections for electric dryer
Figure 4b - Plug-to-terminal connections
5. If it is necessary to replace the power cord, remove the for electric dryer.
retaining clip that secures the cord to the back panel.
Disconnect the cord from the main harness and the
If continuity exists for both connections,
ground wire from the rear panel, then pull out the power
go to step 6.
cord.
6. Visually check that ALL connectors are fully inserted into If an open circuit is found, check the integrity
the CCU.
of the connections of the power cord to the
7. Visually check that ALL connectors are fully inserted into
harness in the dryer; harness to the CCU;
the UI.
and the integrity of the power cord itself.
8. Reassemble all parts and panels.
5. If it is necessary to replace the power
9. Plug in dryer or reconnect power.
cord, remove the retaining clip that secures
10. Perform steps under "Install Diagnostics", page 5-4, to
verify repair.
the cord to the back panel. Disconnect the
cord from the main harness and the ground
wire from the rear panel, then pull out the
power cord.
6. Visually check that ALL connectors are
fully inserted into the CCU.
7. Visually check that ALL connectors are
fully inserted into the UI.
8. Reassemble all parts and panels.
9. Plug in dryer or reconnect power.
10. Perform steps under "Install Diagnostics",
page 6, to verify repair.

TEST #3: Motor Circuit

For Service Technician Use Only
FOR SERVICE TECHNICIAN'S USE ONLY
CCU
P9
L1
1
5
N
Neu
1
P8
1. Unplug dryer or disconnect power.
2. Remove top panel to access the machine
electronics.
3. Check for loose, worn, or damaged drum
belt—repair as necessary.
4. Door Switch problems can be uncovered
by following procedure under TEST #7: Door
Switch, page 18; however, if this was not
done, the following can be performed without
applying power to the dryer. Connect an
ohmmeter across CCU P8-3 (neutral, white
wire) and P8-4 (door, tan wire).
With the door properly closed, the ohmmeter
should indicate a closed circuit (0–2 ).
If not, check harnesses and connections
between CCU and door switch. If good,
replace the door switch assembly.
5. Motor Circuit Check - Access the CCU and
measure the resistance across P8-4 and P9-1.
If resistance across P8-4 and P9-1 is in
the range of 1 to 6 , the motor circuit is
acceptable. Replace the CCU.
Otherwise, continue to step 6.
6. Check the wiring and components in the
path between these measurement points by
referring to the wiring diagram on page 23.
7. Check the drive motor. Slowly remove the
drum belt from the spring-loaded pulley, gently
letting the pulley down. See figure 5.
Pulley
HybridCare™ Dryer with Heat Pump Technology
TESTING
n
6-7