For Service Technician Use Only
COMPONENT TESTING
(
Cont.
)
Whirlpool
®
24" Compact Condensing Dryer
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3-5
Troubleshooting Tests
IMPORTANT:
The following procedures may require the use of
needle probes to measure voltage. Failure to use needle probes
will damage the connectors.
To properly check voltage, complete the following steps:
1.
Unplug appliance or disconnect power.
2.
Attach voltage measurement equipment to proper
connectors.
3.
Plug in appliance or reconnect power and verify voltage
reading.
4.
Unplug appliance or disconnect power after completing
voltage measurements.
Test #1: ACU Power Check
This test is used to determine if power is present at the machine
control electronics. This test assumes that proper voltage is
present at the outlet.
1.
Unplug dryer or disconnect power.
2.
Check for appropriate line voltages at the outlet: 240 VAC
(electric 2-phase) or 208 VAC (electric 3-phase).
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If line voltage is present, go to step 3.
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If line voltage is not present, check for tripped circuit
breaker or blown household fuse. If CB (circuit breaker)
is not tripped, have customer check with qualified
electrician.
3.
Remove top panel, right side panel, and console to access
the machine electronics.
4. ACU VAC
– With voltmeter set to AC, connect black probe
to ACU CN03 - 2 (L2) and red probe to CN03 - 1 (L1). (See
Figure 1.) Plug in dryer or reconnect power.
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If 240 VAC is present, unplug dryer or disconnect power
and go to step 5.
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If 240 VAC is not present, unplug dryer or disconnect
power and perform
: Supply Connections,
page 3-5.
5. ACU +5 VDC
– With voltmeter set to DC, unplug connector
CN13 from the ACU and connect black probe to CN13 - 4
(ground) and red probe to CN13 - 2 (+5 VDC). Plug in dryer
or reconnect power.
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If +5 VDC is present, unplug dryer or disconnect power
and go to step 8.
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If +5 VDC is not present, go to step 6.
6.
Unplug dryer or disconnect power. Unplug CN15 from the
ACU. Plug in dryer or reconnect power and repeat step 5.
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If +5 VDC returns, one of the thermistors has shorted.
To diagnose thermistors, see Test #4b,
.
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If +5 VDC is not present, go to step 7.
7.
Unplug dryer or disconnect power. Reconnect disconnected
harness to the ACU and unplug CN13 from the ACU. Plug
in dryer or reconnectpower and repeat step 5. Perform
voltage check between CN13 - 3 (WIN) and CN13 - 4
(GND)—DO NOT SHORT PINS TOGETHER.
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If +5 VDC is still missing, unplug dryer or disconnect
power and replace the ACU.
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If +5 VDC returns, unplug dryer or disconnect power
and check harnesses and connections between the ACU
and HMI. If acceptable, replace the HMI.
8.
ACU +12 VDC – with voltmeter set to DC, connect black
probe to ACU CN13 - 4 (ground) and red probe to CN13 - 1
(+12 VDC). Plug in dryer or reconnect power.
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If +12 VDC is present, go to step 9.
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If +12 VDC is not present, unplug dryer or disconnect
power and replace the ACU.
9.
Unplug dryer or disconnect power.
10.
Reassemble all parts and panels.
11.
Perform the Service Test Cycle on
to verify repair.
Test #2: Supply Connections
This test assumes that proper voltage is present at the outlet,
and a visual inspection indicates that the power cord is securely
fastened to the terminal block.
U.S. Installations:
1.
Unplug dryer or disconnect power.
2.
Remove the cover plate from the lower left corner of the
back of the dryer. See figure 2.
3.
With an ohmmeter, check for continuity between the
neutral (N) terminal of the plug and the center contact on
the terminal block. See figure 3a.
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If there is no continuity, replace the power cord and test
the dryer.
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If there is continuity, go to step 4.
4.
In a similar way, check which terminal of the plug is
connected to the left-most contact on the terminal block
and make a note of it. This will be L1 (black wire) in the
wiring diagram. Follow the same procedure for L2 (red
wire). See figure 3a.
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When this is found, go to step 5.
Figure 2 - Remove the cover plate
