Whirlpool 721.663398 manual Fuse blows

Page 28

(TROUBLE 2) Oven does not operate at all, Display window does not display any figures, and no input is accepted.

CONDITION

1. Fuse blows.

CHECK

RESULT

Check continuity

Continuity.

of monitor

 

switch (with

 

door closed).

No continuity.

 

Replace fuse

 

Check continuity

Continuity.

of primary

 

switch (with

 

door opened).

No continuity.

 

Disconnect one

Normal.

side of the wire

 

lead connected

 

from transformer

Fuse blows again

to the high

 

voltage

 

capacitor and

 

operate the unit.

 

CAUSE

Malfunction of the monitor switch.

Shorted contact at the primary switch.

Defective high voltage capacitor.

Defective high volt- age transformer.

REMEDY

Replace fuse, primary, monitor switches, and RELAY(RY2) of P.C.B Assembly.

Replace fuse, primary, monitor switches, and RELAY(RY2) of P.C.B Assembly.

Replace high voltage capacitor.

Replace high volt- age transformer.

2.Fuse does not blow.

 

Check continuity

 

 

 

No continuity.

 

 

 

 

 

 

 

 

 

of thermostat.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continuity.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check continuity No continuity. of power supply

cord.

Defective thermostat.

Defective power supply cord.

Replace thermostat.

Replace power supply cord.

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Contents Division Basic Field Manual For Microwave Oven Page Foreword Adjustment Procedures Check the Door Latch and Switch ClosingAdjust the Latch and Switch Closing Test the Latch and Switch SequenceLatch Latch Board Precautions on Installation Features and SpecificationsGeneral Precautions in USE Trial OperationSpecifications Switch TableSchematic Diagram Overall Circuit Diagram Matrix Circuit for Touch KEY Board Operating Procedures A. Oven Control Panel Easy USE Table Procedure for Measuring Microwave Energy Leakage Measuring Microwave Energy LeakageMeasurement with the Outer Case Removed EquipmentMeasurement with a Fully Assembled Oven Power Output MeasurementRecord Keeping and Notification After Measurement Disassembly Instructions Important NotesDoor Assembly / Removal Magnetron Removal High Voltage Transformer Removal Removing Sensor FAN Motor Assembly / RemovalHigh Voltage Capacitor and Diode Removal Interlock System Interlock MechanismPrimary Interlock Switch Test Secondary Interlock Switch TestMonitor Switch Test Components Test Procedure ResultsTest and Checkout PROCEDURES, and Troubleshooting Test Procedures ComponentsFilament Winding Primary Terminal MagnetronCapacitor High VoltageDiode Power RelayLevel FAN MotorCheckout Procedures for Fuse Blowing Checkout ProceduresProblems Causes Checkout Procedures for Relay Problem aProblem B YES GoodPage Trouble Shooting Condition Cause RemedyCheck ConditionResult Fuse blows Cause Remedy Condition Check ResultCondition Check Result Cause Remedy Check Result Exploded View Door Parts Controller Parts Oven Cavity Parts Latch Board Parts Interior Parts Base Plate Parts Sensor Parts No MFL30502909

721.663398 specifications

The Whirlpool 721.663398 is a versatile refrigerator designed to meet the demands of modern households while providing exceptional performance and energy efficiency. With its sleek design and innovative features, this model stands out in the realm of home appliances, offering both style and functionality.

One of the standout features of the Whirlpool 721.663398 is its spacious interior, which provides ample room for storing groceries and other food items. The refrigerator is designed with adjustable shelves that can be easily configured to accommodate various types of food and beverages, making it a practical choice for families of all sizes. Additionally, the inclusion of door bins adds to the organization, allowing for easy access to smaller items like condiments and snacks.

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Overall, the Whirlpool 721.663398 combines style, functionality, and energy efficiency into one cohesive appliance. Its spacious interior, advanced cooling technology, and convenient features make it an excellent choice for those seeking a reliable refrigerator that caters to the needs of modern living. Whether you're stocking up for a large family or hosting social gatherings, this refrigerator is well-equipped to handle it all.
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