Whirlpool 72974 Fiche technique - Page 3
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Imprimer la pageTECH SHEET - DO NOT DISCARD
– BELT/BELT SWITCH
– MOTOR
– DOOR SWITCH
– EVEN HEAT CONTROL
IMPORTANT: Electrostatic (static elec-
tricity) discharge may cause damage to
electronic control assemblies. See page 1
for details.
Procedure:
1. Set the following configuration:
Door - must be closed
Timer - TIMED DRY
Fabric Care/Temperature switch -
AIR FLUFF
2. Check connector pins in P2 at the Even
Heat Control to make sure they are making
contact.
3. Check the voltage at the Timer (reference
Neutral):
a. At Timer BK voltage should be 120VAC.
If not, check the input voltage line (L1).
b. If voltage is present at BK, check Timer
voltage at BU. If voltage is not 120VAC,
replace the Timer.
4. Check for 120VAC at the PTS switch and
Motor Relay. 120VAC (reference Neutral)
should be present at:
one side of the PTS switch
one side of the Motor Relay contacts
(large terminals)
If 120VAC is not present at these locations,
check the harness connections. If harness
connections are good, go to Step 5.
5. Press and hold the PTS switch.
a. Check the voltage at the PTS switch. If
120VAC is not present at both terminals,
replace PTS switch.
b. Check the voltage at the Motor Relay:
Both sides of the Motor Relay contacts
(large terminals) should be 120VAC with
reference to Neutral.
If 120VAC is not present at one of the
Motor Relay contacts, then check for
48VDC from P2-7 to P3-2. If 48VDC is
correctly shown, replace the Motor Re-
lay. If not 48VDC, then replace the Even
Heat Control Assembly.
6. If the motor does not start, check the Door
switch (D to D1). There should be continu-
ity when the door is closed. If not, replace
the Door switch.
7. Press the PTS switch. If the motor starts but
does not continue to run, replace the Even
Heat Control Assembly.
8. Press and hold the PTS switch. If motor
does not start, replace the motor.
PROBLEM: Dryer Will Not Heat
(Refer to Heater Strip Circuit, page 6)
If the heat will not turn on, check the following:
–
LINE VOLTAGE (120V)
–
HARNESS/CONNECTION
–
HEATER RELAY
–
THERMAL FUSE
–
HIGH LIMIT THERMOSTAT
FOR SERVICE TECHNICIAN'S USE ONLY
–
HEATER
– CENTRIFUGAL SWITCH
– THERMISTOR
–
EVEN HEAT CONTROL
IMPORTANT: Electrostatic (static elec-
tricity) discharge may cause damage to
electronic control assemblies. See page 1
for details.
Procedure:
1. Set the following configuration:
Door - must be closed
Fabric Care/Temperature switch -
COTTON / TOWELS
Timer - TIMED DRY
2. Press the PTS switch. The dryer will start,
and the heater will take several seconds to
turn on.
3. Check the voltage at the Heater Relay:
P3-1 to P3-2 should be 48VDC
COM to NO should be ~0VAC
a. If the voltage is 48VDC at the P3-1 to
P3-2 terminals, and ~120VAC at the
COM and NO terminals, replace the
Relay.
b. If the voltage is 0VDC at the P3-1 to P3-2
terminals, replace the thermistor.
c. If, after replacing the thermistor, the
voltage is still 0VDC at the P3-1 to P3-2
terminals, replace the Even Heat Control
Assembly.
PROBLEM: Dryer Heats During
Air Fluff/No Heat Cycle
(Refer to Heater Strip Circuit, page 6)
If the dryer heats when the Fabric Care/Tem-
perature switch is set to AIR FLUFF (No Heat),
check the following:
– HARNESS/CONNECTION
– HEATER RELAY
– FABRIC CARE SWITCH
– EVEN HEAT CONTROL
IMPORTANT: Electrostatic (static elec-
tricity) discharge may cause damage to
electronic control assemblies. See page 1
for details.
Procedure:
1. Perform the Fabric Care/Temperature Switch
Test on page 2.
2. Set the following configuration:
Door - must be closed
Fabric Care/Temperature switch -
AIR FLUFF
Timer - TIMED DRY
3. Press the PTS switch.
a. Check voltage on Heater Relay. If P3-1
to P3-2 is 0VDC, replace the Heater
Relay.
b. If P3-1 to P3-2 is 48VDC, replace the
Even Heat Control Assembly.
PROBLEM: Dryer Won't Shut
Off
(Refer to Motor and Moisture
Sensor Strip Circuits, page 6)
If the dryer will not shut off, check the following:
–
PUSH TO START (PTS) SWITCH
–
HARNESS/CONNECTION
–
MOTOR RELAY
– MOISTURE SENSOR
– EVEN HEAT CONTROL
IMPORTANT: Electrostatic (static elec-
tricity) discharge may cause damage to
electronic control assemblies. See page 1
for details.
Procedure:
1. Set the Timer to OFF. If the dryer starts run-
ning as soon as it is plugged in, replace the
Timer.
2. Set the following configuration:
Dryer - power cord plugged in
Door - must be closed
Fabric Care/Temperature switch -
COTTON / TOWELS
Timer - TIMED DRY for less than 10
minutes
3. If the dryer starts running before the PTS
switch is pressed, replace the PTS switch.
4. If, after replacing the PTS switch, the dryer
still starts before the PTS switch is pressed,
replace the Motor Relay.
5. If the dryer does not stop after the set time
elapses, check the Motor Relay.
a. If the voltage is 0VAC at COM to NO,
replace the Motor Relay.
b. If the voltage is 120VAC at COM to NO,
replace the Even Heat Control Assembly.
6. If the dryer will not terminate its cycle when
set to AUTO MOISTURE SENSING PLUS,
check the Moisture Sensor.
a. If there is continuity to Ground for Yellow/
Red (Y/R) wire with no load, look for a
short in the Sensor or Y/R wire. Verify
harness connections both at the Sensor
and the Even Heat control.
b. If the Sensor and Y/R wire are good, re-
place the Even Heat Control Assembly.
PROBLEM: Dryer Shuts Off
Before Clothes Are Dry
(Refer to Thermistor Test, page 2, and
Moisture Sensor Strip Circuit, page 6)
If the dryer shuts off too soon when set to the
AUTO MOISTURE SENSING PLUS cycle,
check the following:
– HARNESS/CONNECTION
– MOISTURE SENSOR
– THERMISTOR
– EVEN HEAT CONTROL
IMPORTANT: Electrostatic (static elec-
tricity) discharge may cause damage to
electronic control assemblies. See page 1
for details.
Procedure:
1. Test the Moisture Sensor by following the
procedure outlined in "Factory Test",
beginning on page 1. If the Moisture Sen-
sor fails the "Factory Test" (does not pro-
duce a beep sound), check the Moisture
Sensor.
PART NO. 3979119
PAGE 3