A washing machine inspection should run selected units through the main operating stages. Switching on the display is not enough. The checked samples should fill, wash, rinse, drain, and spin without uncontrolled leakage, unsafe operation, repeated program failure, abnormal mechanical noise, or excessive movement.

Before arranging the inspection, our office team reviews the purchase order, approved specification, user manual, approved sample information, rating-label artwork, packaging files, accessory list, and buyer inspection instructions. Numerical limits and special-test conditions should only be applied when they are stated in the approved documents, the applicable working instruction, or the buyer-approved inspection plan.

Routine factory-site inspection and controlled performance testing serve different purposes. On-site checks can review the actual production order, basic functions, workmanship, labels, packaging, leakage, and selected electrical items. Washing efficiency, rinse performance, water use, energy use, long-term durability, and declared performance normally require controlled methods. IEC 60456:2024 defines methods for measuring household washing-machine performance and separates those methods from acoustic-noise measurement.^[1] Buyers can review the difference between product testing and product inspection before defining the project scope.

Check type	What may be reviewed	Important limit
Routine on-site inspection	Basic operation, visible workmanship, leakage, controls, accessories, labels, packaging, and observable noise or movement	Results apply to the checked samples and recorded site conditions
Measured on-site test	Input power, dimensions, weight, rotation speed, noise, or selected electrical checks	Requires suitable equipment, a defined method, and an approved acceptance value
Laboratory or controlled performance test	Wash performance, rinse performance, energy use, water use, endurance, and complete technical or safety evaluation	Cannot be replaced by a short random inspection

Wash Function

Wash-function inspection covers the operating sequence, not only the motor. A washing machine may power on but still fill incorrectly, stop during washing, fail to drain, skip the rinse stage, remain locked, or fail when the drum reaches a higher spin speed.

Setup

The machine must be installed correctly before a functional result can be judged. A wrong drain-hose position, retained transport bolt, uneven floor, unstable supply, or unsuitable test load can create a false failure.

Before adding water, our team checks:

• Model, color, declared capacity, voltage, frequency, and plug configuration
• Cabinet, control panel, display, drum, door, lid, detergent drawer, and external fittings
• Inlet hose, drain hose, sealing washers, tools, manuals, and model-specific accessories
• Transport bolts and other shipping restraints
• Adjustable feet and contact with the floor
• Water connection, drainage point, and power supply
• Hoses that may be crushed, folded, blocked, stretched, or installed at the wrong height
• Foam blocks, cable ties, tape, or loose accessories left in a moving area

For operating tests, transport bolts should be removed according to the user manual. After testing, draining, and drying, they should be reinstalled when the approved packing method requires the drum to be secured for shipment. The same stage-based rule applies to protective foam: packing material that blocks movement is removed for testing and restored before final packing.

The inspection record should identify the sample, program, supply condition, water connection, load, floor condition, hose arrangement, and functions completed.

Operating condition	Main purpose
Empty drum	Controls, water filling, basic rotation, drainage, leakage, error messages, and specified no-load observations
Representative load	Imbalance control, suspension, drum contact, door-seal leakage, spin performance, and operating stability
Rated-capacity test	Only used when the load material, weight, program, method, and acceptance criteria are defined

A few random garments do not prove rated capacity. They may also create an artificial imbalance. The report should state whether the sample was tested empty, lightly loaded, or with a buyer-defined load.

Inspection points vary by machine design.

Machine type	Main focus
Front-loading washer	Door gasket, door lock, transport bolts, drum suspension, pump filter, drainage, and spin stability
Top-loading washer	Lid control, pulsator or agitator, tub balance, water-level control, overflow path, and drain system
Twin-tub washer	Wash tub, spin tub, drain selector, timers, spin-cover control, and connections between separate systems
Washer-dryer	Wash and dry functions are reviewed separately; a successful wash cycle does not confirm drying performance
Compact or portable washer	Hose adapters, manual connections, drainage arrangement, cabinet stability, and lid operation

Depending on the available time and approved scope, the machine may be checked through a normal program, short program, rinse-and-spin program, separate drain program, separate spin program, or approved diagnostic mode. A shortened method should still reach every function listed as checked.

Cycle Check

Stage	Main checks	Common problems
Power and controls	Display, indicators, buttons, selector, start, pause, lock, and error response	No power, missing display segment, delayed response, wrong selection, or repeated reset
Filling	Inlet valve, water route, level control, dispenser, and shut-off	No fill, continuous fill, overflow, wrong compartment, or inlet error
Washing	Drum, pulsator or agitator movement, direction change, motor response, and sequence	No movement, slipping, scraping, stalling, or wrong movement pattern
Rinsing	Refill, movement, drainage, and program transition	Skipped rinse, frozen program, unexplained restart, or incorrect sequence
Draining	Pump, hose, filter cap, remaining water, and error response	Blocked flow, pump failure, backflow, leakage, or water remaining in the drum
Spinning	Lock, balance control, speed increase, drainage, vibration, and safe stopping	No spin, repeated failed start, drum impact, sliding, or unsafe unlocking

Power and controls

The machine should start without smoke, visible sparking, burning odor, repeated rebooting, or an unexplained safety error. Buttons and selectors should operate the function printed beside them. A button that works only after repeated pressing can prevent normal use and should not be treated as a small cosmetic problem.

Where the approved checklist requires repeated control operation, buttons or selectors may be operated for 20 cycles or the buyer-defined count. They should remain fixed, readable, and functional after the check.

Water filling

The inlet valve should open when required and close when the selected water level is reached. Our team checks:

• Whether water enters through the correct valve and detergent channel
• Whether the selected water level produces the expected control response
• Whether filling stops without overflow
• Whether water continues to enter during pause or power-off when it should not
• Whether hot and cold inlets operate correctly on dual-inlet models
• Whether the machine shows an inlet error under suitable site conditions

Water pressure affects filling time. A fixed time limit should only be used when the pressure, water level, program, and acceptance value are defined.

Wash movement

The drum, pulsator, or agitator should move smoothly and follow the selected program. Our team looks for stalled movement, one-direction operation where alternation is required, belt slipping, scraping, heavy impact, repeated stopping, or a display that changes while the mechanical function does not.

Different programs may use different speeds, pauses, and direction patterns. A slower delicate program should not be judged against a normal program or another machine model. Visual observation can confirm basic operation, but it does not prove wash performance or exact rotation speed.

Heating

When the machine includes an internal heater and heating is part of the scope, our team checks whether the selected program enters the heating stage without an error, abnormal odor, overheating, or unexpected shutdown. A displayed temperature or warm door does not prove that the declared water temperature was reached. Actual temperature verification requires an approved measuring method.

Rinsing

The machine should refill, move the load, drain, and change stages in the correct order. A factory-site cycle can confirm the rinse sequence, but it does not establish detergent-removal performance unless the detergent, load, water condition, program, and test method are controlled.

Draining

Drainage should be reviewed in a fixed order:

1. Confirm that the hose position and installation height match the manual.
2. Check for folding, crushing, blockage, or an excessively deep drain connection.
3. Start the drain function and confirm that the pump operates.
4. Observe whether water flow remains continuous.
5. Check the filter cap, hose joints, pump area, and cabinet base.
6. Review the water remaining in the drum.
7. Confirm that the program can continue into spinning.

A hose installed too high can slow the flow. A hose installed too low can create siphoning. These setup conditions should be corrected before a pump or machine defect is assigned.

Spinning

The spin stage places a higher load on the motor, suspension, drum, cabinet, door lock, and drainage system. The machine should increase speed in a controlled way, remain stable, continue draining where required, slow down safely, and release the door or lid according to the approved design.

Normal imbalance control may stop the drum, turn slowly to redistribute the load, reduce speed, extend the cycle, or display a temporary message. Further review is needed when the machine repeatedly fails with a suitable load, strikes the cabinet, moves after correct leveling, enters high-speed spin before drainage is complete, or releases the door while the drum is still moving at an unsafe speed.

Safety Controls

For front-loading machines, the door should close firmly, prevent program start when not properly latched, remain locked during hazardous movement, and release only after the safe control sequence. Top-loading and twin-tub machines may use a lid switch, lid lock, or spin-cover control. The required response should match the approved design and user instructions.

Safety-related findings may include:

• High-speed operation with an ineffective door or lid control
• Water entering an electrical area
• Exposed wire or accessible live part
• Smoke, sparking, damaged insulation, or a burned terminal
• Accessible sharp metal edge
• Loose power-cord strain relief
• Loose internal parts that can contact wiring or moving components

IEC 60335-2-7:2024 addresses safety requirements for electric washing machines for household and similar use.^[2] A normal product inspection does not replace the complete safety evaluation required for a product design or destination market.

Selected on-site electrical checks may include input power, polarity, earth continuity, or dielectric-strength testing when they are part of the approved scope. The test voltage, duration, current limit, connection points, appliance class, and acceptance result should come from the approved method. Our team records the actual result but does not present a limited on-site check as full certification or complete regulatory approval.

Where independent laboratory evidence is required, the selected laboratory and test scope should be suitable for the requested work. ISO/IEC 17025 sets requirements for the competence, impartiality, and consistent operation of testing and calibration laboratories.^[3] UTS can coordinate applicable laboratory testing separately from routine inspection.

Water Leakage

Leakage should be observed during filling, washing, rinsing, draining, and spinning. A connection may remain dry during the first minutes and leak only after the water level rises, the drum moves, the pump starts, or vibration affects a hose or seal.

Inlet System

Before starting the cycle, our team dries the cabinet, hose joints, dispenser area, filter area, and surrounding floor. New water can then be distinguished from earlier factory-test water or setup spills.

The inlet system check covers:

• Correct hose type and quantity
• Hose cuts, crushing, hardening, deformation, or damaged threads
• Presence and condition of sealing washers
• Valve-body cracks
• Hot and cold inlet identification
• Caps on unused inlets where required
• Joint stability after correct tightening
• Detergent drawer alignment and water direction

A connection left loose during setup is not valid evidence of a product defect. A damaged thread, missing washer, cracked fitting, or joint that cannot seal after correct installation should be recorded.

The inlet joints should be observed when the valve opens and again after remaining under pressure. The detergent drawer should also be checked for cracking, blockage, incorrect assembly, overflow, or water entering the wrong compartment.

When water appears	Main areas to check
As filling begins	Tap connection, inlet hose, washer, valve body, and dispenser
After the water level rises	Water-level control, outer tub, overflow path, dispenser, and internal tubes
Only during drum movement	Door gasket, door alignment, tub joint, and internal hose movement
Only during drainage	Pump, filter cap, tub outlet, drain hose, and hose connection
Only during high-speed spinning	Door gasket, vibration-related joint movement, and drain-hose position
Slow dripping after the cycle	Valve closure, pressurized joint, retained water, and light seal seepage

Door and Tub

For front-loading machines, our team checks the door glass, hinge alignment, latch, gasket, retaining ring, and lower gasket area.

Common gasket findings include:

• Tear, puncture, or permanent deformation
• Folded or uneven sealing edge
• Loose retaining ring
• Poor contact with the door glass
• Foreign material on the sealing surface
• Blocked drainage holes
• Contact between the rotating drum and gasket

A gasket may look acceptable while the drum is still but leak when wet laundry lifts and falls against it. The door area should therefore be observed during wash movement and spin acceleration.

For top-loading and twin-tub machines, the main areas include the tub seam, shaft area, drain valve, overflow path, internal hoses, tub outlet, and connections below each tub.

Other possible internal leak points include the outer-tub joint, pump housing, pump filter, heater seal where fitted, water-level sensor tube, dispenser hose, inlet-valve outlet, internal drain hose, hose clamps, and bearing area.

Water evidence	How it should be recorded
Active leakage	New water appears from a joint, seal, pump, hose, tub, or cabinet during operation
Residual water	Water remains from earlier factory testing inside the pump, hose, filter, or tub
Setup spill	Water is released while attaching or removing a hose, opening a wet door, or opening a filter

Residual water is not automatically an active leak. It should still be reported when it wets the machine, creates odor, damages the packaging, or shows that the product was repacked without suitable draining and drying.

Drain System

Drainage can expose leakage that does not appear during filling because the pump creates a faster flow and the machine may begin to vibrate.

During the drain stage, our team checks whether:

• The drain hose remains attached and correctly positioned
• The hose splits, swells, collapses, or moves out of the drain
• The pump housing and filter cap remain dry
• Water leaves through the intended route
• Water appears below the cabinet
• Water returns to the tub
• The machine leaks during the change from drain to spin
• The pump runs without water for an unexplained period

A useful leakage record identifies the model, sample number, program, operating stage, exact source, flow pattern, effect, repeat result, and available photo or video evidence.

Sample ID	WM-07
Program	Rinse and Spin
Load	Buyer-defined test load
Stage	Drain
Finding	Water dripping from the pump-filter area
Repeat result	The same leakage appeared during the repeated drain test
Effect	Water collected below the front-right cabinet area
Required review	Check the filter seal, screen affected units, and repeat the drain stage after repair

After repair, the affected unit should be run through the stage that caused the failure. Repeating only the filling stage does not verify a leak originally found during drainage. When the same leak appears on several samples, the buyer may need broader screening, corrective action, and a follow-up inspection.

Noise and Vibration

Water valves, pumps, relays, motors, belts, rotating drums, and moving laundry all produce sound. The purpose of the inspection is to identify abnormal noise and uncontrolled movement, not to expect complete silence.

Noise

Before judging product noise, our team confirms that the setup conditions described earlier remain correct. Transport bolts, a loose drain hose, a power cord striking the cabinet, a machine touching a wall, an object left in the drum, or an uneven floor can create noise unrelated to a product defect.

Sound	Common stage	Main inspection direction
Scraping	Wash or spin	Drum contact, gasket contact, foreign object, or poor alignment
Repeated knocking	Spin acceleration	Uneven load, suspension, counterweight, drum contact, or loose cabinet part
Grinding	Drain, wash, or spin	Pump, bearing, gearbox, motor, belt, or moving-part contact
Rattling	Any moving stage	Panel, screw, hose, cord, filter cover, accessory, or internal fitting
Continuous humming	Fill, drain, or motor start	Powered valve, pump, or motor that cannot operate normally
High-pitched squeal	Wash or spin	Belt slipping, friction, motor, or rotating component
Single click	Program transition	May be normal relay, valve, or lock operation unless it repeats without function

The report should identify the operating stage, sound type, approximate location, duration, repeatability, load condition, and effect on function. “Machine is noisy” is too vague for corrective action.

A one-metre factory-site observation or measurement may be included for selected samples when it is part of the approved working instruction. It should not be presented as a standardized acoustic result unless the complete method, operating mode, load, room condition, background noise, meter position, and equipment requirements are followed.

IEC 60704-2-4:2025 provides particular requirements for determining airborne acoustic noise from household washing machines and spin extractors.^[4] A phone reading taken on a noisy production floor is not equivalent to this controlled method.

Vibration

Excessive movement may come from installation, the test load, or the product itself.

Cause group	Examples
Installation	Transport bolts fitted, machine not level, foot not touching the floor, weak floor, or hose pulling the cabinet
Test load	One heavy item on one side, tangled laundry, unsuitable load amount, or load outside the approved method
Product	Suspension failure, loose counterweight, off-centre drum, bearing problem, weak base, or failed imbalance control

During spinning, our team observes:

• Cabinet rocking or sliding
• Feet lifting from the floor
• Drum striking the cabinet
• Repeated failed spin attempts
• Movement that continues after load redistribution
• Hoses or cables pulled by cabinet movement
• Loss of stability or tipping risk
• Repeated imbalance error with a suitable load

Brief movement during an approved load-redistribution sequence may be normal. Continued sliding, foot lifting, repeated cabinet impact, hose damage, or failure to complete the cycle requires review.

Observable evidence may include marking the machine’s starting position, recording movement after the spin stage, filming the front and side of the cabinet, checking whether a foot leaves the floor, repeating the same program and load, and retesting after the feet are adjusted.

A precise vibration value requires a defined instrument, sensor position, speed, load, stage, and acceptance limit. Without those controls, the report should describe visible movement and operational effect.

When an inclined-plane stability check is included, the angle should come from the approved project method. The UTS working instruction contains 10° and 8° reference conditions for specified procedures, but these values are not universal requirements for every washing-machine model or market.

Shipment Review

A Final Random Inspection is normally arranged when production is 100% complete and at least 80% packed. New models, complex products, or higher-risk suppliers may also require an Initial Production Inspection at approximately 5%–10% completion or a During Production Inspection at approximately 30%–50% completion.

Washing-machine inspection may combine a general random sample with smaller special-test samples. Appearance, basic function, labels, and packaging may use the general sample, while longer, measured, electrical, or partly destructive checks may use a smaller quantity defined in the inspection plan.

Where AQL sampling is used, the lot size and inspection level determine the sample-size code. The selected AQL then determines the acceptance and rejection numbers. ISO 2859-1:2026 defines acceptance-sampling plans for inspection by attributes.^[5] AQL is not a promise that the buyer accepts the same percentage of defective products in the full shipment.

The UTS washing-machine working instruction uses General Inspection Level II with Critical = none, Major = 1.5, and Minor = 4.0 as a reference unless the buyer approves another plan. These values should not be confused with general AQL examples used for other products or orders. More information is available in the UTS AQL sampling guide.

Defect class	Washing-machine examples
Critical	Unsafe door-lock operation, accessible live part, water entering an electrical area, smoke, sparking, or another immediate safety hazard
Major	Failure to wash, drain, or spin; continuous leakage; severe movement; drum impact; wrong electrical rating; or missing critical accessory
Minor	Appearance or assembly issue outside the approved workmanship requirement without material effect on normal use

The final classification depends on severity, location, repeatability, safety effect, functional effect, and the buyer-approved defect list. A passed AQL result does not override a critical safety finding.

Supporting checks should cover the rating label, model, voltage, frequency, capacity marking, plug, accessories, user manual, carton information, packing protection, and shipping restraints. Power-cord length, dimensions, and weight should be compared with the approved specification. A universal 1.5-metre cord requirement or ±5% tolerance should not be assumed unless it is assigned in the project documents.

The UTS working instruction contains carton-drop conditions for packaged products below 27.7 kg. Most full-size washing machines exceed this range. A drop test should therefore only be performed when the packed weight, approved method, equipment, product type, and site safety conditions support it.

When barcode or QR code verification is included, readability for the checked samples must reach 100%. Our team checks whether the print is clear, each code scans successfully, and the scanned data matches the printed number, model, SKU, label file, or approved shipping information. An unreadable code or incorrect encoded result should be recorded, corrected, and rechecked. A result below 100% should not be treated as acceptable.

Safety or approval marks may be compared with the buyer-provided label artwork and documents for consistency. UTS does not issue CE, UL, ETL, CSA, or other certifications, and a normal inspection does not confirm complete certification validity.

When repeated leakage, drainage failure, door-lock failure, or vibration is found, the next steps should be based on evidence:

1. Correct any unsuitable test setup and repeat the affected function.
2. Record the sample, program, load, stage, and defect location.
3. Check whether the same problem appears on other samples.
4. Review the defect against the approved specification and defect list.
5. Define the factory screening or corrective-action scope.
6. Run repaired units through the original failed stage.
7. Arrange broader screening or re-inspection when the finding is repeated or systematic.
8. Review the AQL result, critical findings, unavailable tests, and corrective-action evidence before release.

Buyers can use the UTS guide on reviewing a failed inspection report to assess defect evidence and recheck needs. Where random sampling no longer provides enough control, a 100% full inspection after a failed FRI may be considered for the affected model, component, production lot, or agreed defect scope.

After inspection, our team provides the report for client review. It should show the production and packing status, sampled units, tests completed, actual results, defects, photographs, limitations, label and barcode findings, and packaging condition. The report supports the buyer’s decision to release, hold, rework, screen, or reinspect the shipment. It does not guarantee that every uninspected unit is defec-free.