Whirlpool 4.3 CU FT Service Manual page 42

COMPONENT TESTING
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.
TEST #10: Fan, Post Condenser (FM)
This test is performed when the fan for the post condenser is
not spinning.
NOTE: To test the post condenser fan, plug in dryer or
reconnect power. Press POWER, select Timed Dry, and press
START. The fan should start running.
The following items are part of this system:
Part of Post Condenser Fan System
Harness/connection
Post Condenser Fan
Appliance Control Unit (ACU)
1. Unplug dryer or disconnect power.
2. Remove the fan grille on the back panel to access the
fan. Verify that the grille and fan blades are free from
obstructions and that the fan can spin.
3. Remove top panel, left side panel, and console to access
the machine electronics.
4. Visually check that the J2 connector is inserted all the way
into the ACU.
¾ If visual check passes, go to step 5.
¾ If connector is not inserted properly, reconnect J2 and
retest.
FAN
FAN STRIP CIRCUIT
ACU
L1
BK
J13-1
n
3-18 Whirlpool Compact Heat Pump Dryer
For Service Technician Use Only
Heat Pump Dryer
BR
J2-1
TR2
5. Remove connector J2 from the ACU. With an ohmmeter,
measure the resistance across pins 1 and 3.
6. Resistance should be approximately 464 Ω ±10%.
¾ If the reading is infinite (open), go to step 7.
¾ If the reading is correct, go to step 11.
7. Remove the rear panel to access the post condenser fan.
8. Visually check that the in-line fan connector is securely
connected.
¾ If visual check passes, go to step 9.
¾ If connections are loose, reconnect the in-line fan
connector and retest.
9. With an ohmmeter, check the harness for continuity
between the fan and the ACU J2-1 and J2-3 connector.
¾ If there is continuity, go to step 10.
¾ If there is no continuity, repair or replace the upper
dryer harness and retest.
10. With an ohmmeter, measure the resistance across the
two fan connector terminals. Resistance should be
approximately 464 Ω ±10%.
¾ If the reading is infinite (open), replace the fan and
retest.
¾ If the reading is correct, go to step 11.
11. With a voltmeter set to AC, connect the black probe to
ACU J13-1 (L1) and the red probe to J13-2 (L2). Plug in
dryer or reconnect power.
¾ If 240 VAC is present, unplug dryer or disconnect
power and go to step 12.
ü
¾ If 240 VAC is not present, unplug dryer or disconnect
ü
power and perform TEST #2: Supply Connections, page
13.
ü
12. With a voltmeter set to AC, follow Test #1: ACU Power
Check, page 12, AC and 5V verification.
¾ If 240 VAC is present, go to step 13.
¾ If 240 VAC is not present, go to step 13.
13. If the preceding steps did not correct the post condenser
fan problems, replace the ACU.
¾ Unplug dryer or disconnect power.
¾ Replace the ACU.
¾ Reassemble all parts and panels.
¾ Retest fan operation.
FAN
F
W W
415 - 510 OHMS
Figure 1 - Fan Strip Circuit
ACU
BR
J2-3
L2
R
J13-2