Whirlpool MFW 9700S, MFW 9600S manual Theory of Operation

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PRODUCT OPERATION

THEORY OF OPERATION

INTRODUCTION

The Maytag Epic Front-Loading Automatic Washer presents a number of new features and operating characteristics quite different from previous models. The washer contains a number of unique operating features designed to increase clothes cleaning ability while offer- ing very high water and energy conservation.

WATER SYSTEM

The water system consists of the hot and cold water inlet valves, a water temperature sensor, a water flowmeter and control, and the dis- penser distribution system along with a tradi- tional pressure switch.

WATER INLET VALVES

The hot and cold water inlet valves are located at the back of the washer. These valves re- ceive a control signal from the Central Control Unit to manage the temperature of incoming water. The temperatures are determined by the specific wash cycle selected and a tem- perature sensor located in the wash tub. To improve cleaning of heavily soiled clothing and to provide a sanitizing feature, the water tem- perature can be increased through the use of a heating element located in the bottom of the tub.

FLOWMETER

The flowmeter is also used to introduce addi- tional water into the tub for higher water levels, based on cycle requirements.

Flowmeter

DISPENSER DISTRIBUTION SYSTEM

All wash and rinse water is introduced into the wash tub through a Dispenser Distribution Sys- tem located in the top left corner of the washer. The system consists of a motor that turns a cam gear. The cam follower will divert the incoming water to one or more of the follow water inlet modes:

Detergent Dispensing

Bleach Dispensing

Fabric Softener Dispensing

Rinse Dispensing (no additives)

Water flow, or the quantity of water introduced throughout any cycle, is monitored by a flow- meter and Central Control Unit. When the flowmeter registers a maximum of 10.5 gal (40 L), and the Central Control Unit has not detected the pressure switch trip, the water valves will be shut off and an error code will show in the digital display.

Cam

Dispenser

Motor

Cam

Actuator

Water Follower

Distribution

Lever

3-1

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Contents Epic Forward Goals and ObjectivesTable of Contents Wiring Diagram Safety First GeneralModel & Serial Number Designations Model NumberSerial Number Model & Serial Number Label Tech Sheet Locations Specifications Maytag Corporation Major Appliance Warranty Page 1234566541728919243 7937226757947867 93278675445627 75445627834473#678#87968258928 $4487968258928Electrician+ 1233456768479346724 2273$%&%*$% ,&## 2$&+1234546#2&%2$!#2 &-.0$$+&. /+2+$ &+&+$&#0 7878 388787 #$%2&&8$87Theory of Operation AIR Vent System Pressure Switch Motor Control Unit MCU TOUCHPAD/LED AssemblyCentral Control Unit CCU Drive MotorPump Motor ECO ValveSuspension System Heating Element Temperature Sensor Door LOCK/SWITCH AssemblyInterlock Switches 971771997 7271792869795947679476 42OFF56789797797998234567896358769795947 346286979594767947Modifier6.766765677866767 123456789382945875694878594587 682 123455367892234563789345647 7397826739868934345$747 #5&61234567 Sturdy colorfast fabrics12345678935 888 88#$89777 8977897779 77 7#Ordisconnect83783power 83783### 123456376468with liquid detergent64326%9894 %24 352631234567 35 37 5 67 8312345674674 9728879Component Access Component LocationsRemoving the Console and the Touchpad / LED Assembly To remove the consoleTo remove the touchpad / LED assem- bly Door Lock/Switch Assembly Bellows Retaining Wire To remove the door lock/switch as- sembly To remove the front panel and bellowsOn the next Remove the end of the dispenser tube from the bellows Removing the Flowmeter Removing the Detergent Dispenser Motor & Assembly To remove the detergent dispenser motorTo remove the detergent dispenser as- sembly Removing the Inlet Valves Removing the Central Control Unit Removing the Interference Filter Removing the Pressure Switch Removing the Motor Controller Wire Standoff Removing the Temperature Sensor Heating Element To remove the temperature sensorTo remove the heating element Removing the Drain Pump Assembly Removing the Airtrap Removing AN Interlock Switch Rotate Switch Up Switch Holder Locking Tabs Removing the Drive Motor Pivot Stud Removing the TUB and Basket Assembly Align Tabs With Slots Support Weight While Removing Front Slot Front Holes Rear Half Of Tub Basket Front Half Of Tub Reassembly Notes Page Component Testing Water Level Setting Test PointsMotor & Switch Detergent DispenserTo test the door switch To test the door lock main switchesTo test the door lock/unlock solenoids Drain Pump Motor Interference FilterTemperature Results Interlock Switch Diagnostics Diagnostic GuideElectrostatic Discharge ESD Sensitive Electronics FAILURE/ERROR Display Codes Display Explanation and Recommended ProcedureLong Drain Motor Control Unit Error Dispenser Circuit Error CCU / Touchpad / LED Assembly Error Sud Diagnostic Test Starting the Test ModeTest Program Control Water Temperature Sensor Motor Continuity TestManually Unlocking Door Lock System To reassemble CCU To remove the touchpad/LED assemblyTo remove Central Control Unit CCU To remove Motor Control Unit MCUTroubleshooting Chart ProblemDrum will Incorrect Page Wiring Diagram Page Product Specifications Warranty Information Sources United States