Whirlpool WED99HEDW0 Technical Education page 89

7. If the connections looks good, check for continuity
between the violet wire terminal on the compressor relay
(K2) and terminal "C" (common) on the compressor.
¾ If there is continuity, go to step 9.
¾ If there is no continuity, go to step 8.
8. Remove the compressor cover and check for continuity
across the thermo-switch on the compressor (see Figure
1).
¾ If there is continuity, go to step 9.
¾ If there is no continuity, replace the thermo-switch.
9. Remove the compressor cover and remove all three (3)
motor wires; Common (C)=Black, Run (R)=Red, Start
(S)=Yellow). See Figure 1.
Compressor
Motor
Connections
Figure 1 - Compressor Connections/Thermo-Swtich
10. Using the following chart and the strip circuit below, check
for the resistance values of the compressor's Run and
Start winding coils as shown in the following table.
NOTE: Run and Start winding coils must be checked at the
compressor.
COMPRESSOR STRIP CIRCUIT
COMPRESSOR
L1
CYCLE CONTROL UNIT
BK
BK
N.O.
RELAY K2
For Service Technician Use Only
Thermo-Switch
V V
COM1
Winding Resistance
in ohms
RUN 4.13 ±10%
START 6.27 ±10%
START & 10.4 ±10%
RUN
¾ If the resistance at the compressor is correct, go to step
11.
¾ If the Run or Start winding resistance is much greater
or less than the values listed in the table above, replace
the heat pump base assembly.
11. If the preceding steps did not correct the problem and L1
and L2 were both detected in Step 1, replace the CCU.
12. Reassemble all parts and panels.
13. Plug in dryer or reconnect power.
14. Perform steps under "Install Diagnostics", page 5-4, to
verify repair.
Thermo-Switch
C
S
R
Compressor
Figure 2 - Compressor Circuit
COMPRESSOR
RUN
4.13 ohms
BK
C
6.27 ohms
THERMAL
HIGH LIMIT
SWITCH
START
GND
HybridCare™ Dryer with Heat Pump Technology
TESTING
Contact Points
of Measurements
Compressor terminal "C" to
terminal "R"
Compressor terminal "C" to
terminal "S"
Compressor terminal "R" to
terminal "S"
AC Power
Run Capacitor
R
R
R R
Y PK
S
17uF CAP
L2
R
n
6-13