Whirlpool WED9500E SERIES Service Manual page 35

GAS DRYER ONLY:
1. Verify the gas supply to the dryer is turned on.
2. Unplug dryer or disconnect power.
3. Perform TEST #4c: Thermal Cut-Off on page 3-15. If the
thermal cut-off is OK, go to step 4.
4. Locate the high limit thermostat (see figure 2, page 3-13).
Measure the continuity through it by connecting the
meter probes to the red and black wire terminals.
¾ If there is an open circuit, replace both the high limit
thermostat and the thermal cut-off.
¾ Otherwise, go to step 5.
5. Perform TEST #4d: Gas Valve on page 3-16. If the gas valve
is OK, go to step 6.
6. If the preceding steps did not correct the problem,
suspect the centrifugal switch before replacing the ACU.
7. Reassemble all parts and panels.
8. Plug in dryer or reconnect power.
9. Perform steps under "Service Test Mode", page 2-5, to
verify repair.
Heat will not shut off:
ALL DRYERS:
1. Unplug dryer or disconnect power.
2. Remove console to access the machine electronics.
3. Remove connector J14 from the ACU and measure the
STRIP CIRCUITS
resistance between J14-3 and J14-6 at the connector.
Refer to "Outlet Thermistor Resistance" table on page
3-14, for temperatures and their associated values.
MOTOR CIRCUIT
¾ If the resistance corresponds to the temperature, the
L1
outlet thermistor is good.
ACU
¾ If the thermistor resistance does not agree with the
table, replace the outlet thermistor.
4. Check heater coil(s) for a short to ground (usually inside
BK
J9-2
the heater box). Repair or replace if necessary.
K1
5. Plug in dryer or reconnect power.
MOTOR RELAY
6. Run an "AIR" only timed dry cycle (no heat). Check heater
HEATER (ELECTRIC) STRIP CIRCUIT (FIGURE 3)
HEATER (ELECTRIC)
L1
BK BK
THERMAL
CUT-OFF
HEATER (GAS) STRIP CIRCUIT (FIGURE 4)
HEATER (GAS)
L1
ACU
BK
N.O. COM
K2
HEATER RELAY 1
THERMISTORS (INLET/OUTLET)
ACU
For Service Technician Use Only
FOR SERVICE TECHNICIAN'S USE ONLY
LBU LBU
J9-1
THERMAL
FUSE
ACU
HEATER RELAY 1
K2
N.O.
N.O.
K3
HEATER RELAY 2
THERMAL
N.C.
CUT-OFF
R-W
BK
R
HIGH LIMIT
THERMOSTAT
relay output(s) on ACU. Unplug dryer or disconnect
power. With a voltmeter set to AC, connect voltmeter
to terminals 1 & 2 for heater relay #1. Plug in dryer or
reconnect power. Measure the voltage across terminals
1 & 2 for heater relay #1. If equipped, repeat procedure
with heater relay #2.
¾ If voltage is present (~240 VAC for electric, ~120 VAC
for gas), the relay is open and working normally.
¾ If little or no voltage is present, the relay is closed and
1. Unplug dryer or disconnect power.
heater is activated. Unplug dryer or disconnect power
2. Slide the top back, remove the front panel,
and replace the ACU.
front bulkhead, and drum to access thermal
components.
7. Unplug dryer or disconnect power.
3. Check Heaters—on the ACU, use an
8. Reassemble all parts and panels.
ohmmeter to measure the resistance between
9. Plug in dryer or reconnect power.
the violet wire terminal on heater relay #1
and the violet wire terminal on heater relay #2.
10. Perform steps under "Service Test Mode", page 2-5, to
verify repair.
If the resistance is 50 , go to step 5.
If an open circuit is detected, go to step 4.
Inlet Thermistor/High Limit
Thermostat Assembly
FOR SERVICE TECHNICIAN'S USE ONLY
Thermal
Cut-Off
1. Unplug dryer or disconnect power.
2. Slide the top back, remove the front panel,
front bulkhead, and drum to access thermal
components.
3. Check Heaters—on the ACU, use an
ohmmeter to measure the resistance between
the violet wire terminal on heater relay #1
and the violet wire terminal on heater relay #2.
If the resistance is 50 , go to step 5.
If an open circuit is detected, go to step 4.
DRIVE MOTOR
Inlet Thermistor/High Limit
1/3 HP
Thermostat Assembly
Thermal Fuse
MAIN
Thermal
Cut-Off
3.3-3.6
4M
Figure 10a - Thermal components,
Figure 2 - Thermal components,
JUMPER 2.7-3.0
electric dryer, viewed from front.
gas dryer, viewed from front.
START
Thermal Fuse
HEATER 1
V
COM1
19.6
R
Figure 10a - Thermal components,
19.6
V
electric dryer, viewed from front.
COM2
THERMOSTAT
HEATER 2
DO NOT REMOVE OR DESTROY
1V
MOV
BK
1
2
BU
1400 ± 70
FS1
LBU
HEATER GAS VALVE
DO NOT REMOVE OR DESTROY
Whirlpool & Maytag 9.2 Cu. Ft. Steam Dryer
INLET TEMP THERMISTOR
COMPONENT TESTING
FOR SERVICE TECHNICIAN'S USE ONLY
Flame
Sensor
Figure 1 - Thermal components,
Heater
electric dryer, viewed from front.
Element
Thermal Fuse
Flame
Sensor
4. Visually check the wire connections between
each relay and their respective heaters. If the
connections look good, check for continuity
across each heater (violet wire to center red
CENTRIFUGAL
wire). Refer to strip circuit on page 25.
Heater
SWITCH
Replace the heater if it is electrically open.
Outlet
Element
Thermistor
5. Check Thermal Cut-off—on the ACU, use
5M
an ohmmeter to measure continuity between
Electric Dryer
J9-2 (L1) and the black wire terminal on heater
relay #1. Then, measure continuity between J9-2
Thermal Fuse
(L1) and the black terminal on heater relay #2.
3M 6M
If there is continuity, go to step 7.
See Heater Circuit
If an open circuit is detected, go to step 6.
Figure 10b - Thermal components,
6. Visually check the wire connections
between each relay (black wire) and the
4. Visually check the wire connections between
each relay and their respective heaters. If the thermal cut-off. If the connections look good,
connections look good, check for continuity
check for continuity across the thermal cut-off.
across each heater (violet wire to center red
Replace the thermal cut-off if it is
wire). Refer to strip circuit on page 25.
electrically open.
CENTRIFUGAL SWITCH
Replace the heater if it is electrically open.
Outlet
7. Check High Limit Thermostat—visually
Thermistor
5M
5. Check Thermal Cut-off—on the ACU, use
N.C.
check the wire connections from the heaters
an ohmmeter to measure continuity between
See
and centrifugal switch to the high limit
Electric Dryer
R-W
J9-2 (L1) and the black wire terminal on heater
Motor
thermostat. If the connections look good, check
relay #1. Then, measure continuity between J9-2
HIGH LIMIT Circuit
for continuity across the high limit thermostat.
(L1) and the black terminal on heater relay #2.
6M
3M
Replace the high limit thermostat if it is
If there is continuity, go to step 7.
electrically open.
If an open circuit is detected, go to step 6.
6. Visually check the wire connections
between each relay (black wire) and the
thermal cut-off. If the connections look good,
check for continuity across the thermal cut-off.
CENTRIFUGAL SWITCH
R
Replace the thermal cut-off if it is
electrically open.
IG IGR
5M
IGNITOR
7. Check High Limit Thermostat—visually
50-500
W
check the wire connections from the heaters
See
3
and centrifugal switch to the high limit
VALVE 1 Motor
570 ± 28.5
thermostat. If the connections look good, check
W Circuit
4 5 for continuity across the high limit thermostat.
VALVE 2
3M
1300 ± 65
Replace the high limit thermostat if it is
W
FS2
FLAME
electrically open.
SENSOR
Thermal
High Limit Thermostat
Cut-Off
Thermal
High Limit Thermostat
Cut-Off
Outlet
Thermistor
Gas Dryer
Figure 10b - Thermal components,
gas dryer, viewed from front.
N
LBU
2M
N.O.
BU W
DOOR
Outlet
SWITCH
Thermistor
1M
Gas Dryer
gas dryer, viewed from front.
L2
2M
R
1M
N
R LBU
2M
BU W
DOOR
1M
6M
SWITCH
3-13
n
ACU