Troubleshooting Tests - Whirlpool WTW7120HC Manual De Instrucciones

TROUBLESHOOTING TESTS

TEST #1: Main Control (ACU)
This test checks for incoming and outgoing power to and from main control.
This test assumes that proper voltage is present at the outlet.
1. Unplug washer or disconnect power.
2. Remove console to access main control.
3. Verify that ALL connectors are inserted all the way into the main
control.
4. With a voltmeter set to AC, connect black probe to J1-1 (Neutral) and
red probe to J1-2 (Line).Plug in washer or reconnect power.
➢ If 120 VAC is present, go to step 5.
➢ If 120 VAC is not present, check the AC power cord for continuity
(See Figure 11.)
5. Is the "Diagnostic LED" flashing or continuously "ON" or "OFF"?
See Figure 1 for LED location).
➢ Flashing: (+5 VDC present and micro operating) proceed to
➢ ON: (+5 VDC but micro failure) continue to step 8.
➢ OFF: (+5 VDC missing or micro failure) continue to step 6.
6. Check if console HMI is affecting the main control DC supply.
a. Unplug washer or disconnect power.
b. Remove connector J14 from main control.
c. Plug in washer or reconnect power.
d. Recheck the Diagnostic LED per step 5.
➢ If the diagnostic LED is now flashing, go to
is not flashing, continue to step 7.
7. Perform voltage checks inside header J14 on the board – do not short
pins together.
a. With a voltmeter set to DC, connect black probe to J14-4 (Circuit Gnd)
and red probe to J14-1 (+12.7 VDC).
➢ If DC voltage is not present, go to step 8.
➢ If the DC voltage is present, but the diagnostic LED is not flashing,
continue to step 8.
8. Main Control has malfunctioned.
a. Unplug washer or disconnect power.
b. Replace the main control.
c. Reassemble all parts and panels.
d. Plug in washer or reconnect power. Perform Service Diagnostic Cycle
to verify repair.
TEST #2: Valves
This test checks the electrical connections to the valves, and the valves
themselves.
1. Check the relays and electrical connections to the valves by performing
the Cold, Hot, Oxi (not on all models), and Fabric Softener Service Test
under Component Activation. Each test activates and deactivates the
selected valve. The following steps assume one (or more) valve(s) did
not turn on.
2. For the valve(s) in question check the individual solenoid valves.
a. Unplug washer or disconnect power.
b. Remove console to access main control.
c. Remove connector J8 from main control. Refer to
Control.
d. Check harness continuity and connection to solenoid valves.
DO NOT REMOVE OR DESTROY
FOR SERVICE TECHNICIAN'S USE ONLY
HMI Test.
HMI Test. If diagnostic LED
Figure 4 - Main
3. Check resistance of the valve coils across the following J16 connector
pinouts:
Valve
Fabric Softener
OXI (not on all models)
Hot
Cold
Resistance should be 890–1090 Ω.
➢ If resistance readings are tens of ohms outside of range, replace the
valve assembly.
➢ If resistance readings are within range, replace main control and
perform Service Diagnostics to verify repair.
TEST #3: Drive System
1. Enter Service Mode and view Fault Codes. If F7E3, F7E4, F7E6, F7E7,
F7E8, F7E9 or F7EA faults are shown then there is likely a motor or
shifter related issue. Take note of the faults and clear the faults.
2. Once the error codes are cleared, enter Component Activation Mode
and run the Slow Agitation test; if the motor runs after 15–20 seconds,
there is not a problem with the motor, control, or motor wiring harness
connections.
3. Next, within Component Activation Mode, run the Spin Low Speed
cycle. If the motor hums briefly and then shuts down, go to Fault Code
display Mode and check for fault codes.
4. After running agitation and spin test, check for fault codes.
TEST #3a: Drive System – Shifter
This test checks connections, shifter coil, and harness.
NOTE: Lid must be closed and locked for the motor to agitate or spin.
IMPORTANT: Drain water from tub before accessing bottom of washer.
Functional Check:
1. Check the shifter and electrical connections by performing both the
Spin and Agitate tests under Service Test Mode. The following steps
assume that this step was unsuccessful.
2. Unplug washer or disconnect power.
3. The motor and shifter should be able to be turned independently of
each other. If they are locked together, there is a shifter slider issue.
Proceed to step 11.
➢ If basket and impeller turn freely, go to step 4.
➢ If basket and/or impeller do not turn freely, determine what is causing
the mechanical friction or lockup.
4. Remove console to access main control.
5. Visually check that the J3 connector is inserted all the way into the
main control.
➢ If visual checks pass, go to step 6.
➢ If connector is not inserted properly, reconnect J3 and repeat step 1.
6. With a voltmeter set to AC, connect the black probe to J15-1 (N) and
red probe to J15-4. Plug in washer or reconnect power. Activate shifter
motor by switching the shifter output ON and OFF. Energize outputs
using Component Activation
toggle the shifter. Alternately, Spin and Agitate can be commanded to
switch shifter in Component Activation Mode.
IMPORTANT: Lid must be closed to run the Spin and Agitate tests.
➢ If 120 VAC is present, go to step 7.
➢ If 120 VAC is not present, unplug washer or disconnect power and go
to step 11.
Pinout
J16, 1 & 6
J16, 1 & 7
J16, 1 & 5
J16, 1 & 2
Mode. NOTE: Motor must be stopped to
15