Whirlpool WGD9500E SERIES, Service Manual

Page: 44 / 64

3-22
n
Whirlpool & Maytag 9.2 Cu. Ft. Steam Dryer
COMPONENT TESTING
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
STRIP CIRCUITS
MOTOR CIRCUIT
HEATER (ELECTRIC)
HEATER (GAS)
THERMISTORS (INLET/OUTLET)
MOISTURE SENSORS
WATER VALVE CIRCUIT
L1
BK
J9-1
K1
MOTOR RELAY
ACU
DRIVE MOTOR
1/3 HP
MAIN
START
2.7-3.0
Ω
3.3-3.6
Ω
5M
3M 6M
2M
1M
See Heater Circuit
LBU
BU
N.O.
DOOR
SWITCH
W
N
J9-2
CENTRIFUGAL
SWITCH
LBU
THERMAL
FUSE
LBU
4M
JUMPER
L1
ACU
BK
HEATER RELAY 1
K2
K3
HEATER RELAY 2
N.O.
N.O.
COM1
COM2
BK
V
V
HEATER 1
HEATER 2
19.6
Ω
R R-W
N.C.
HIGH LIMIT
THERMOSTAT
CENTRIFUGAL SWITCH
See
Motor
Circuit
1M
2M
3M
5M
6M
R
L2
THERMAL
CUT-OFF
19.6
Ω
L1
ACU
BK
K2
HEATER RELAY 1
N.O.
50-500
Ω
HIGH LIMIT
THERMOSTAT
CENTRIFUGAL SWITCH
1M
2M
3M
5M
6M
N
COM
R
N.C.
BK
THERMAL
CUT-OFF
R-W
MOV
BK
LBU
FS1
FS2
4 5
1 3
2
1V IG
IGR
HEATER GAS VALVE
1400 ± 70
Ω
570 ± 28.5
Ω
1300 ± 65
Ω
W
W
W
FLAME
SENSOR
VALVE 1
VALVE 2
IGNITOR
R
R LBU
See
Motor
Circuit
BU W
DOOR
SWITCH
BU
ACU
J14-2
50K
Ω
R
J14-3
R-W
R
R-W
10K
Ω
INLET TEMP THERMISTOR
OUTLET TEMP THERMISTOR
J14-1
J14-6
INLET THERMISTOR
OUTLET THERMISTOR
ACU
INLET THERMISTOR RTN
OUTLET THERMISTOR RTN
ACU
J13-1
BK
MOISTURE SENSOR
ACU
MOISTURE SENSOR RTN
MOISTURE SENSOR 1
J13-2
J8-2
CHASSIS GND
Y-R
MOV MOV
BK R
G-Y G-Y
G-Y
CHASSIS GND
L1
N
WATER VALVE
J8-1
K4
VALVE RELAY
510-590
Ω
BK R
ACU
J8-3
W
Figure 13 - Strip circuits.
For Service Technician Use Only
TEST #9: Water Valve
Activate Service Test Mode (see page 2-5). Skip to Step 8 in
Service Test Mode Chart (see page 2-5). Verify that water is
being sprayed into the drum. See figure 1.
NOTE: Refer to the strip circuit below (Figure 2) to diagnose
water valve.
If water leaks from the dryer/too much water being sprayed
into the drum:
1. Inside the drum, unscrew the water nozzle.
2. Inspect nozzle opening for residue buildup; clean and
replace it.
If no water is sprayed in the drum:
1. Verify that water is connected and turned on.
2. Unplug dryer or disconnect power.
3. Remove console to access the machine electronics.
4. Verify that the red wire coming from the water valve is
connected to the ACU, J8-1. Refer to wiring diagrams on
pages 3-4 and 3-5.
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Failure to do so can result in death or
electrical shock.
Replace all parts and panels before operating.
WATER VALVE STRIP CIRCUIT
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
TEST #8: Drum LED
This test is performed if the drum LED does
not light.
1. Unplug dryer or disconnect power.
2. Remove the console to access ACU
and user interface (UI).
3. Verify that the drum LED connector J6
(see figure 2, page 12 and wiring diagrams,
pages 26 and 27) is securely connected
to the ACU.
4. Check harness and inline connections
between the drum LED and ACU.
¾
If the harness and connections are good,
go to step 5.
¾
If not, repair or replace as needed.
5. Unplug the drum LED connector J6
(see figure 2, page 12 and wiring diagrams,
pages 26 and 27) from the ACU.
6. With a multimeter set to milliamps, connect
multimeter to ACU connector J6 , pins 1 and
3. Plug in dryer or reconnect power. Open
the door. Measure the current across ACU
connector J6 , pins 1 and 3. If the drum LED
driver is working properly, there should be a
measurement of 150 mA.
¾
If the current is present, unplug dryer or
disconnect power and replace the drum LED.
¾
If the current is not present, unplug dryer
or disconnect power and replace the ACU.
7. Reassemble all parts and panels.
TEST #9: Water Valve
Activate Service Test Mode (see page 3).
Skip to Step 8 in Service Test Mode Chart (see
page 6). Verify that water is being sprayed into
the drum. See figure 12.
NOTE: Refer to strip circuit on page 25 to
diagnose water valve.
If water leaks from the dryer/too much water
being sprayed into the drum:
1. Inside the drum, unscrew the water nozzle.
2. Inspect nozzle opening for residue buildup;
clean and replace it.
If no water is sprayed in the drum:
1. Verify that water is connected and turned on.
2. Unplug dryer or disconnect power.
3. Remove console to access the machine
electronics.
4. Verify that the red wire coming from the
water valve is connected to the ACU, J8-1.
Refer to wiring diagrams on pages 26 and 27.
5. Check Water Valve & Harness—using an
ohmmeter, measure the resistance between
the ACU J8-1 (red wire) and J9-2 (black wire).
¾
If the resistance is 1300
1
(±5%), go to
step 6; if not, replace the water valve.
¾
If an open circuit is detected, go to step 7.
6. Inside the drum, unscrew and replace the
water nozzle using a 7/16 " wrench or socket.
Retest water valve.
¾
If water does not dispense, go to step 7.
7. Access the water valve by removing the
back panel.
¾
Check that the hose and wires are connected
to the water valve assembly (see figure 12).
¾
Check that the water valve assembly hose
is connected to the nozzle.
8. If everything is connected and the water
still does not dispense:
¾
Unplug dryer or disconnect power.
¾
Replace the valve assembly and retest.
9. If the preceding steps did not correct
the problem, replace the ACU.
Water Valve Assembly
Figure 12 - Water System Components.
Figure 1 - Water System Components
5. Check Water Valve & Harness—using an ohmmeter,
measure the resistance between the ACU J8-1 (red wire)
and J9-2 (black wire).
¾
If the resistance is 1300 Ω (±5%), go to step 6; if not,
replace the water valve.
¾
If an open circuit is detected, go to step 7.
6. Inside the drum, unscrew and replace the water nozzle
using a 7/16” wrench or socket. Retest water valve.
¾
If water does not dispense, go to step 7.
7. Access the water valve by removing the back panel.
¾
Check that the hose and wires are connected to the
water valve assembly (see Figure 1).
¾
Check that the water valve assembly hose is connected
to the nozzle.
8. If everything is connected and the water still does not
dispense:
¾
Unplug dryer or disconnect power.
¾
Replace the valve assembly and retest.
9. If the preceding steps did not correct the problem, replace
the ACU.
Figure 2 - Water Valve Strip Circuit