Service Manual

COMPONENT TESTING
Whirlpool & Maytag Front-Load Dryers
n
3-23
For Service Technician Use Only
TEST #9: Water Valve (on some models)
Acvate Service Diagnosc Mode (see page 2-4). Perform Step
8 in Service Test Mode Chart (see page 2-6). Verify that water
is being sprayed into the drum. See gure 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 or
replace it.
If no water is sprayed in the drum:
1. Verify that water is hooked up and turned on.
2. Unplug dryer or disconnect power.
3. Remove top panel to access the ACU.
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 to 3-7, or the strip circuit below.
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 (on some models)
This test is performed if the drum LED does
not light.
1. Pressing the DRUM LIGHT button on the
console should toggle the button indicator on
and off (and the drum LED on and off).
¾If the button indicator toggles on and off,
go to step 2.
¾If the button indicator does not turn on, go
to TEST #6 – “Some buttons do not light,”
page 21.
2. Unplug dryer or disconnect power.
3. Remove the top panel to access ACU
and HMI.
4. Verify that drum LED connector J6
pins 1 and 2 align with the ACU.
5. Check harness and inline connections
between the drum LED and HMI.
¾If the harness and connections are good,
go to step 6.
¾If not, repair or replace as needed.
6. Unplug the drum LED connector J6
(see wiring diagrams, pages 26 and 27)
from the HMI.
7. With a multimeter set to milliamps, connect
multimeter to HMI connector J6, pins 1 and 3.
Plug in dryer or reconnect power. Press the
DRUM LIGHT button on the console until the
button indicator is on. Measure the current
across HMI connector J6, pins 1 and 3. If the
drum LED driver is working properly, there
should be a measurement of 150–370 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 HMI.
8. Reassemble all parts and panels.
TEST #9: Water Valve (on some models)
Activate the Service Test Mode (see page 5).
Perform Step 8 on page 7. Verify that water is
being sprayed into the drum. See figure 13.
NOTE: The motor and heater are also activated
during this test. Refer to strip circuit on page 23
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 hooked up and turned on.
2. Unplug dryer or disconnect power.
3. Remove top panel to access the ACU.
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 510–590 1, 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 back
panel; see page 24.
¾Check that the hose and wires are connected
to the water valve assembly (see figure 13).
Water Nozzle
Water Valve Wires
Water Valve Assembly
Figure 13 - 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 510-590 W, 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 sll 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
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
45
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-YG-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.
J9-2