[pdf-embedder url=’http://appliancetechmanuals.com/wp-content/uploads/whirlpool/tech-sheet-3977371.pdf’ title=’tech-sheet-3977371′]TECH SHEET – DO NOT DISCARD PAGE 1

Electrical Shock Hazard Disconnect power before servicing. Replace all panels before operating. Failure to do so could result in death or electrical shock.

IMPORTANT

Electrostatic Discharge (ESD) Sensitive Electronics

Do not open package until it is time to install the electronic board.

ESD problems are present everywhere. ESD may damage or weaken the electronic board. The new board may appear to work well after repair is finished, but failure may occur at a later date due to ESD stress.

s Use an anti-static wrist strap. Connect wrist strap to green ground connection point or unpainted metal in the appliance, -OR- Touch your finger repeatedly to a green ground connection point or unpainted metal in the appliance.

s Before removing the part from its package, touch the anti-static bag to a green ground connection point or unpainted metal in the appliance.

s Avoid touching electronic parts or terminal contacts; handle electronic board by edges only.

s When repackaging failed electronic board in anti-static bag, observe above precautions.

AUTO DRY PLUS FABRIC WRINKLE GUARD SIGNAL PUSH TO START with TEMPERATURE III ELECTRONIC MOISTURE SENSING

NORMAL DRY MORE DRY

DAMP DRY KNIT END OF CYCLE SOFT LOW

OFF EXTRA DELICATE NORMAL OFF ON HAND WASHABLES PERM PRESS WRINKLE GUARD III WRINKLE GUARD III OFF LOUD EXTRA LOW MEDIUM

OFF AIR FLUFF COTTON NO HEAT HIGH

10 80 TOUCH UP TIMED DRY 20 70 30 40 60 50

Exclusive EVENHEAT Drying System Heavy Duty Super Capacity Plus Quiet Pak Plus Kenmore 90 Plus Series

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 3977371

PAGE 2 TECH SHEET – DO NOT DISCARD

Gas Dryer Wiring Diagram IMPORTANT: Electrostatic (static electricity) discharge may cause damage to electronic con- trol assemblies. See page 1 for details.

L1 LINE – BLACK WHITE – NEUTRAL N

DRUM LAMP 120 VOLTS

BLACK DL BROWN

TIMER EVEN HEAT CONTROL D2 BK BLACK PT-1 TIMER D1 WHITE

DOOR P2-6 BLUE D DOOR

BU P1-1 MTR SWITCH

MOIST P2-5 G/Y

V P1-2 T2 GND SENSOR MOIST. P2-4 G/Y R P1-3 T3 TEMP. P2-3 Y/R RED THERMISTOR

W P1-4 T4 MODEL P2-2 WHITE W/R W/R

BU P2-1 WHITE

BLUE NEUTRAL GRAY P3-8 WRINKLE WHITE 5M TAN BLUE CENTRIFUGAL RED HEATER P3-7 1 GUARD 4 SWITCH RELAY VIO COM WGUARD P3-6 MAIN HEATER R/W 4M 2.4-3.6

P3-1 HI FABRIC BELT START 3 SWITCH 2.4-3.8 R/W FS-1 NO BLK HEATER 2 4 3M 6M

P3-2 LOW FS-2 DRIVE MOTOR 1V IG IGR

BU FS-3 P3-5 1 5 IGNITOR

NO MOTOR PK/BK ORG 50-500 VALVE NO.1 VALVE NO.2 RELAY T/W SIGNAL 2 1 3 FLAME COM P3-4 SENSOR PTS P2-7 MOTOR LOUD 2 4 HOLD ASSIST START

BU PK/BK SOFT P3-3 1 NC BLUE 3V 4 5 START W/BK BLK BU/BK RED TF1 TF2 RED/WHITE MAIN P1-5 SENSE

BLUE THERMAL FUSE HS1 HI LIMIT HS2 FS1 FS2 196°F THERMOSTAT RED 205°F 22,000 BTU/HR

CONTACTS BLUE VIOLET WHITE GREEN/ Drum Size: Drum Speed: 7.0 cubic feet 48 ± 3 RPM CCW Centrifugal FUNCTION 3M 5M 6M BLACK YELLOW Switch START (Motor) RUN RED RED

= CONTACTS CLOSED

Pluggable BLACK WHITE Drive Motor Switch BLUE WHITE BLUE BU PK/BK Gas Valve

PK/BK

BU V

Motor Relay

RED B W R/W U

B B K K

3976594 R/W R

Even Heat Electronic RED Timer Control Assembly Heater Relay

PART NO. 3977371 FOR SERVICE TECHNICIAN’S USE ONLY

TECH SHEET – DO NOT DISCARD PAGE 3

Component Location

L.H. 3390646 (2) Control 3388228 (2) Heater 3398893 Rear Panel Signal Push To Start R.H. Heater Relay Relay Control Bracket (PTS) End Cap End Cap Timer Screw Bracket Ground Switch Screws Ground Wire Timer Relay or Switch

R

KB B K

W B U

V

Trim 3390646 (2) Console Even Heat Fabric/Temp Wrinkle Guard 3390646 3388228 (2) Motor Trim Switch Motor Relay Relay R.H. L.H. End Cap Panel Control Switch Ground Screw End Cap Screws End Cap Screws Asm

Part Number Damp Dry Test

MODEL NOS. MODEL NOS. Begin with an empty dryer and clean lint screen.

COMPONENT 78932792 78934792 1. Set the following configuration: s Timer – DAMP DRY Console Panel (Basic) 78942892 78944892 s Fabric/Temperature switch – COTTON HIGH for White Models: s Wrinkle Guard switch – OFF 78972892 78974892 s Signal switch – LOUD s Door – must be closed (White) (Almond) 2. Press the PUSH TO START switch. After approxi- 78932792 3406530 – mately 16 seconds, the Timer will start to advance to the OFF position, and the “End of Cycle” signal 78942892 3976549 – will sound. If one or more of these functions do not occur, proceed to the Factory Test. 78972892 3977004 – Factory Test for Almond Models: 78934792 – 3406531 The Factory Test allows factory/service personnel to 78944892 – 3976550 test and verify all inputs to the Even Heat Control. The basic operation of this test is to notify the operator with 78974892 – 3977005 an audible beep every time the status of an input to the control changes state. End Cap – R. H. 3949274 3949275 Activating the Test Mode End Cap Trim – R. H. 3951009 3951010 1. Set the following configuration: End Cap – L. H. 3949280 3949281 s Door – must be open s Fabric/Temperature switch – AIR FLUFF End Cap Trim – L. H. 3951013 3951014 s Signal switch – LOUD s Timer – TIMED DRY or AUTO DRY PLUS selection P.T.S. Switch 3395382 3395382 2. Turn the Wrinkle Guard switch from OFF to ON P.T.S. Knob * 3402566 3402568 three times within a five second period. A double beep will sound to indicate that the factory test Control Knob * 3402572 (3) 3402574 (3) mode is activated.

Signal Switch 3405151 3405151 NOTE: If any of these initial conditions are not sat- isfied, the control will not enter the test mode. Wrinkle Guard Switch 3405152 3405152

Temperature Switch 3399643 3399643

Motor Relay 3405281 3405281

Heater Relay 3405281 3405281

Even Heat Control Assembly 3976594 3976594

Timer Knob * 3402594 3402596

Console Harness * 3976590 3976590

Main Harness * 3976592 3976592

Door Switch * 3392266 3392266

Thermal Fuse * 3390719 3390719

Gas Burner Assembly * 3402243 3402243

Hi-Limit Thermostat * 3403140 3403140

Drive Motor * 3395654 3395654

Thermistor – NTC 10K Ohms * 3406294 3406294

Timer for Models:

78932792, 78934792 3976586 78942892, 78944892, 78972892, 78974892 3976585

* not shown

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 3977371

PAGE 4 TECH SHEET – DO NOT DISCARD

Test Mode Functionality Fabric/Temperature Switch Test

When the control is in the Factory Test mode, every Remove the wires from Orange Violet Tan input change of state will result in a beep (with the the switch to complete exception of the Signal switch). This includes: this test. 1 23

s Door switch Reference contact 4 5 s Moisture Sensor (short/open Sensor will result in continuity to Pin 4 (White). FABRIC a beep) NOTE: A moistened finger or damp cloth may also be used White s Fabric/Temperature switch s Wrinkle Guard switch Fabric/Temperature Switch Table s Push To Start (PTS) switch (with the door switch closed) SWITCH CONTACTS FUNCTION s Timer (any cam input change will result in a POSITION 321 beep) NOTE: Timer will advance during test. 9 O’clock OOO AIR FLUFF If any of the inputs do not result in a beep, proceed to the following component tests. 10 O’clock OOX DELICATE

Timer Test 12 O’clock OXO KNITS

Perform the Factory Test to determine that the timer 2 O’clock OXX PERM PRESS motor advances (should run continuously). 3 O’clock XOO COTTON To determine if the Even Heat Control Board is sending the required pulse sequences to the timer motor: O=OPEN X=CLOSED

1. Set the Volt/Ohmmeter to read up to 120VAC. Wrinkle Guard Switch (On/Off) Test

2. Place the probes at PT01 and P1-1 on the Even Remove the wires from Gray 1 Heat Control Board. the switch to complete White this test. 4 3. Operate the dryer in the TIMED DRY cycle. Meter should read ON 7 sec., OFF 113 sec. Reference contact WRINKLE continuity to Pin 4 GUARD Remove the wires (White) from timer terminals V to complete this test. Wrinkle Guard Switch Table Reference contact B W SWITCH POSITION CONTACTS FUNCTION continuity to U Timer – BK. Eleven O’clock Open Wrinkle Guard Off One O’clock Closed Wrinkle Guard On

B B K K

R

Timer Encoding Table “End of Cycle” Signal Switch Test

TIMED DRY MODE Remove the wires from Tan/White the switch to complete White/Black TIMER CONTACTS TIMED DRY COOL DOWN WRINKLE GUARD OFF this test.

W to BK O O O O Reference contact 12 continuity to Pin 4 4 R to BK X X O O (White). SIGNAL

V to BK O X X O

BU to BK X X X O White

AUTO DRY PLUS MODE

TIMER CONTACTS MORE NORMAL DAMP WRINKLE OFF Signal Switch Table DRY DRY DRY GUARD

W to BK X X O O O SWITCH CONTACTS FUNCTION POSITION R to BK O O O O O 1 2 Ten O’clock V to BK X O O X O Twelve O’clock OO OFF

BU to BK X X X X O Two O’clock X O SOFT End of Cycle Signal

O=OPEN X=CLOSED O X LOUD End of Cycle Signal

O=OPEN X=CLOSED

PART NO. 3977371 FOR SERVICE TECHNICIAN’S USE ONLY

TECH SHEET – DO NOT DISCARD PAGE 5

High Limit s Timer Dial – TOUCH UP Thermostat s Fabric/Temperature switch – COTTON HIGH s Wrinkle Guard switch – OFF Flame s Signal switch – LOUD Sensor s Door – must be closed

Thermal 2. Press the Push To Start switch. Fuse a. If you hear three short beeps and the dryer shuts Thermistor off after several seconds, the thermistor is either shorted or open and must be replaced. To re- Figure 1 place the thermistor, unplug the dryer and re- move the front toe panel. Remove the two wires Heater Box High-Limit Thermostat and replace the thermistor as shown in Figure 1. Test b. If the dryer appears to operate correctly, pro- Remove the thermistor from the fan housing and plug ceed to step 3. the hole. Protect the thermistor and leads from ground- ing against any metal parts. See Figure 1. Completely 3. Remove exhaust vent and start the dryer. block the exhaust outlet. Turn dryer on and allow the high-limit thermostat to cycle once, then measure the a. Turn Fabric/Temperature switch to desired tem- time elapsed until the high-limit thermostat trips. It perature to be tested, and select 20 minutes on should trip between 21 and 38 seconds. the Timed Dry dial. Hold a glass bulb thermometer IMPORTANT: Be sure to reinstall the thermistor after capable of reading from 90°F to 180°F in the cen- testing thermostat. ter of the exhaust outlet. Measure exhaust tem- peratures with heater off and on. The correct Thermal Fuse Test exhaust temperatures are as follows:

A thermal fuse is used on this model. The thermal fuse FABRIC/TEMP. HEAT TURNS HEAT TURNS is wired in series with dryer gas valve. If the thermal fuse opens, power is shut off to the valve. SWITCH SETTING OFF ON Once the thermal fuse has opened, it must be re- placed. Check for failed thermistor or other cause of COTTON HIGH 150°±10°F 10° – 15°F failure. Replace failed parts. Refer to Figure 1. below heat off

Thermistor Test NORMAL PERM 140°±10°F 10° – 15°F PRESS MEDIUM below heat off An electronic temperature sensor called a thermistor is used in this model in place of an operating thermo- KNIT LOW 125°±10°F 10° – 15°F stat. The Even Heat Control monitors the exhaust tem- below heat off perature using the thermistor and cycles the heater relay on and off to maintain the desired temperature. EXTRA DELICATE 115°±10°F 10° – 15°F Procedure below heat off Begin with an empty dryer and a clean lint screen. EXTRA LOW

1. Set the following configuration: b. If the exhaust temperature is not within the specified limits, check the resistance of the ther- mistor.

THERMISTOR THERMISTOR RESISTANCE RESISTANCE

TEMP. ° F RES. K TEMP. ° F RES. K

50° 19.9 100° 5.7 60° 15.3 110° 4.7 70° 11.9 120° 3.7 80° 9.2 130° 3.1 90° 7.4 140° 2.5

c. If the thermistor resistance checks within nor- mal limits, replace the Even Heat Control.

Gas Valve Diagnosis

Using an ohmmeter, it is possible to determine if either gas valve is defective. Remove harness plugs. Meas- ure resistance across terminals indicated in the follow- ing chart. Readings should match those shown in chart. If not, replace coil.

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 3977371

PAGE 6 TECH SHEET – DO NOT DISCARD

TERMINALS RESISTANCE 5. If the motor does not start, check the Door switch (D to D1). There should be continuity when the 1 to 2 1365 ± 25 door is closed. If not, replace the Door switch. 1 to 3 560 ± 25 4 to 5 1220 ± 50 6. Press the PUSH TO START switch. If the motor starts but does not continue to run, replace the IMPORTANT: Be sure all har- Even Heat Control. ness wires are looped back through the strain relief after 7. Press and hold the PUSH TO START switch. If mo- checking or replacing coils. tor does not start, replace motor.

PROBLEM: Dryer Will Not Run PROBLEM: Dryer Will Not Heat

(Refer to Motor Strip Circuit, page 8) (Refer to Heater Strip Circuit, page 8)

If the motor will not start, check the following: If the heat will not turn on, check the following:

– LINE VOLTAGE – BELT/BELT SWITCH – LINE VOLTAGE (120V) – HEATER – HARNESS/CONNECTION – MOTOR – HARNESS/CONNECTION – CENTRIFUGAL SWITCH – MOTOR RELAY – DOOR SWITCH – HEAT RELAY – THERMISTOR – PUSH TO START SWITCH – EVEN HEAT CONTROL – THERMAL FUSE – EVEN HEAT CONTROL – HI LIMIT THERMOSTAT

IMPORTANT: Electrostatic (static electricity) IMPORTANT: Electrostatic (static electricity) discharge may cause damage to electronic discharge may cause damage to electronic control assemblies. See page 1 for details. control assemblies. See page 1 for details.

Procedure: Procedure:

1. Set the following configuration: 1. Set the following configuration: s Door – must be closed s Door – must be closed s Timer – TIMED DRY s Fabric/Temperature switch – COTTON s Fabric/Temperature switch – AIR FLUFF s Timer – TIMED DRY

2. Check the voltage at the Timer (reference Neutral): 2. Press the PUSH TO START switch. The dryer will start, and the heater will take several seconds to turn on. a. At Timer BK voltage should be 120VAC. If not, check the input voltage line (L1). 3. Check the voltage at the Heater Relay: s P3-1 to P3-2 should be 48VDC b. If voltage is okay at BK, check Timer voltage at s COM to NO should be ~0VAC BU. If voltage is not 120VAC, replace Timer. a. If the voltage is 48VDC at the P3-1 to P3-2 3. Check for 120VAC at the PTS switch and Motor terminals, and ~120VAC at the COM and NO Relay. 120VAC (reference Neutral) should be pre- terminals, replace the Relay. sent at: s one side of the PTS switch b. If the voltage is 0VDC at the P3-1 to P3-2 termi- s one side of the Motor Relay contacts (large nals, replace the thermistor. terminals) c. If, after replacing the thermistor, the voltage is If 120VAC is not present at these locations, check still 0VDC at the P3-1 to P3-2 terminals, replace the harness connections. If harness connections the Even Heat Control. are good, go to Step 4. PROBLEM: Dryer Heats During Air 4. Press and hold the PUSH TO START switch. Fluff/No Heat Cycle

a. Check the voltage at the PTS switch. If 120VAC is (Refer to Heater Strip Circuit, page 8) not present at both terminals, replace PTS switch. If the dryer heats when the Fabric/Temperature switch b. Check the voltage at the Motor Relay: Both sides of the Motor Relay contacts (large terminals) is set to AIR FLUFF (No Heat), check the following: should be 120VAC with reference to Neutral. – HARNESS/CONNECTION – EVEN HEAT CONTROL – HEAT RELAY If 120VAC is not present at one of the Motor Relay contacts, then check for 48VDC from P2- IMPORTANT: Electrostatic (static electricity) 7 to P3-2. If 48VDC is correctly shown, replace the Motor Relay. If not 48VDC, then replace the discharge may cause damage to electronic Even Heat Control. control assemblies. See page 1 for details.

PART NO. 3977371 FOR SERVICE TECHNICIAN’S USE ONLY

TECH SHEET – DO NOT DISCARD PAGE 7

Procedure: PROBLEM: Dryer Shuts Off Before Clothes Are Dry 1. Set the following configuration: s Door – must be closed (Refer to Thermistor Test, page 5, and s Fabric/Temperature switch – AIR FLUFF Moisture Sensor Strip Circuit, page 8) s Timer – TIMED DRY If the dryer shuts off too soon when set to the AUTO DRY PLUS cycle, check the following: 2. Press the PUSH TO START switch. – HARNESS/CONNECTION a. Check voltage on Heater Relay. If P3-1 to P3-2 – MOISTURE SENSOR is 0VDC, replace the Heater Relay. – EVEN HEAT CONTROL – THERMISTOR b. If P3-1 to P3-2 is 48VDC, replace the Even Heat Control. IMPORTANT: Electrostatic (static electricity)

PROBLEM: Dryer Won’t Shut Off discharge may cause damage to electronic control assemblies. See page 1 for details. (Refer to Motor and Moisture Sensor Strip Circuits, Procedure: page 8) 1. Test the Moisture Sensor by following the proce- If the dryer will not shut off, check the following: dure outlined in “Factory Test”, beginning on page 3. s If Moisture Sensor fails the “Factory Test” (does – PUSH TO START (PTS) SWITCH – MOISTURE SENSOR not produce a beep sound), replace Moisture – HARNESS/CONNECTION – EVEN HEAT CONTROL Sensor. – MOTOR RELAY 2. If Factory Test is passed, verify thermistor by per- IMPORTANT: Electrostatic (static electricity) forming the test procedures outlined in “Thermistor Test”. discharge may cause damage to electronic control assemblies. See page 1 for details. 3. If problem persists after replacing Moisture Sensor and thermistor, replace the Even Heat Control. Procedure: PROBLEM: Timer Continuously 1. Set the Timer to OFF. If the dryer starts running as Advances soon as it is plugged in, replace the Timer. (Refer to Timer Drawing, page 2, and 2. Set the following configuration: Motor Strip Circuit, page 8) s Dryer – power cord plugged in If the dryer continues to advance past the OFF posi- s Door – must be closed tion, check the following: s Fabric/Temperature switch – COTTON s Timer – TIMED DRY for less than 10 minutes – HARNESS/CONNECTION – TIMER 3. If the dryer starts running before the PUSH TO START switch is pressed, replace the PTS switch. IMPORTANT: Electrostatic (static electricity)

4. If, after replacing the PTS switch, the dryer still discharge may cause damage to electronic starts before the PUSH TO START switch is pressed, control assemblies. See page 1 for details. replace the Motor Relay. Procedure: 5. If the dryer does not stop after the set time elapses, check the Motor Relay. 1. Verify the Blue wire and the Black L1 wires are in the correct positions: The Black wire goes next to a. If the voltage is 0VDC at COM to NO, replace the Red wire, and the Blue wire is located on the the Motor Relay. three terminals that are close to each other.

b. If the voltage is 120VDC at COM to NO, re- 2. Test the Timer by following the procedure outlined place the Even Heat Control. in “Factory Test”, beginning on page 3.

6. If the dryer will not terminate its cycle when set to 3. If the Timer continues to advance past OFF, then AUTO DRY PLUS, check the Moisture Sensor. replace the Timer.

a. If there is continuity to Ground for Y/R with no load, look for a short in the Sensor or Y/R wire. Replace Sensor if shorted.

b. If the Sensor and Y/R are good, replace the Even Heat Control.

FOR SERVICE TECHNICIAN’S USE ONLY PART NO. 3977371

PAGE 8 TECH SHEET – DO NOT DISCARD

MOTOR STRIP CIRCUIT WHITE – NEUTRAL N

L1 LINE – BLACK

120 VOLTS

TIMER EVEN HEAT CONTROL D2 D1 WHITE BK BLACK PT-1 DOOR P2-6 BLUE TIMER D DOOR SWITCH

BU P1-1 MTR

BU P3-2 HEATER LOW BLK BLUE BU PK/BK NO MOTOR RELAY 5M

PTS COM P2-7 MOTOR BLUE 4M MAIN CENTRIFUGAL BLK BU PK/BK START 2.4-3.6 SWITCH BU/BK BELT P1-5 START SWITCH START SENSE 2.4-3.8

3M 6M

BLUE DRIVE MOTOR

HEATER STRIP CIRCUIT 120 VOLTS WHITE – NEUTRAL N D1 WHITE D2 L1 LINE – BLACK DOOR BLUE D SWITCH EVEN HEAT CONTROL

P2-3 RED THERMISTOR TEMP. W/R W/R

NEUTRAL P2-1 WHITE 5M

CENTRIFUGAL SWITCH

3M 6M

1V IG IGR

RED COM HEATER HEATER 50-500 IGNITOR RELAY HI 3 P3-1 2 1 VALVE R/W HEATER ASSIST NO.1 NO P3-2 LOW NC BLUE 3V HOLD 5 VALVE R/W 4 NO.2 HI LIMIT HS2 MAIN RED TF1 TF2 RED/WHITE THERMOSTAT FLAME SENSOR THERMAL FUSE HS1 205 °F FS1 FS2

196 °F 22,000 BTU/HR

MOISTURE SENSOR STRIP CIRCUIT WHITE – NEUTRAL N

L1 LINE – BLACK

TIMER 120 VOLTS BK EVEN HEAT CONTROL BU BLACK PT-1

TIMER

BU P1-1 MTR MOIST P2-5 G/Y

GND

MOIST. P2-4 Y/R SENSOR G/Y

P2-1 WHITE NEUTRAL

PART NO. 3977371 PART NO. 3977371

NOTE: This sheet contains important Technical Service Data

FOR SERVICE TECHNICIAN ONLY DO NOT REMOVE OR DESTROY

FOR SERVICE TECHNICIAN’S USE ONLY