On-site inspection methods and test contents of heaters by inspectors, factory inspections, and certification services

1. Overview and importance of heater inspection

As seasonal heating equipment, the quality of fan heaters directly impacts the safety of users' lives and property. As inspectors, you must fully understand the inspection standards and testing methods for fan heaters to ensure they meet international safety standards and customer requirements. This article systematically explains the inspection process, testing methods, and quality requirements for fan heaters from a professional inspection perspective, providing practical reference for QC personnel.

2. Preparation before inspection and factory audit

1. Supplier qualification review

• Check the quality system certification status of the manufacturing company (ISO9001, ISO14001, etc.)

• Review product certification information (CE, UL, GS, etc.)

• Verify the validity of production licenses and product test reports

2. Production environment assessment

• Check production line layout and equipment condition

• Evaluate ESD protection and fire safety measures

• Review of raw material storage management and traceability system

3. Inspection equipment calibration

• Confirm the calibration status of equipment such as safety testers and power meters

• Check the integrity of test tools and fixtures

• Verify the temperature and humidity control of the test environment

3. Packaging inspection standards and inspection requirements

1. Outer box inspection

• Check the outer box for cleanliness, strength and printing quality

• Verify the accuracy and completeness of box marking information

• Confirm that packaging materials meet environmental protection requirements

2. Color box inspection

• Check the color box material, structure and printing quality

• Verify barcode scannability and accuracy

• Confirm packaging assembly correctness and completeness

3. Accessories and Documents Inspection

• Check the correctness of documents such as instruction manuals and warranty cards

• Verify the suffocation warning and ventilation holes on the packaging bag

• Confirm that the type and quantity of accessories are consistent with the list

4. Product labeling inspection

• Check the accuracy of nameplate parameters (voltage, power, frequency)

• Verify compliance with safety warning labels

• Verify the quality and durability of all stickers

4. Mechanical structure safety inspection

1. Inspection of protective structures

• Check the fixing reliability of the heating element protective cover

• Contact test using test bar No. 41 of IEC 61032

• Verify that the protective cover does not touch the heating element under the action of 5N force

2. Stability test

• Place the product on a 15° tilted plane (UL standard is 10°)

• Check whether the product has overturned in the most unfavorable position

• Apply 5N horizontal force to test stability of products weighing more than 5kg

3. Mesh cover protection test

• Apply 20N thrust and pull along the motor axis

• Use Type B test probes to verify that hazardous parts are inaccessible

• Check the deformation and damage of the grille after the test

5. Electrical safety performance test

1. High voltage test

• Comply with IEC60335-1 & IEC60335-2-30 standards

• Differentiated testing according to UL-1278

• Record test parameters and results

2. Ground continuity test

• Measure the resistance between the ground terminal and accessible metal parts

• Verify the reliability and durability of ground connections

• Record resistance value and judge compliance

3. Insulation resistance test

• Apply test voltage between live parts and accessible surfaces

• Measure the insulation resistance value and record it

• Determine whether safety standards are met

6. Functional performance testing and inspection standards

1. Switch and temperature control function test

• Continuous switch test more than 3 times to verify reliability

• Check the accuracy of power changes in each gear

• Detect abnormal sounds, odors or smoke during operation

2. Input power test

• IEC standard: +5%/-10% tolerance range

• UL standard: no more than +5% tolerance

• Record test conditions and results

3. PTC heater power test

• Instant power reading and recording

• 30-minute average power measurement (if applicable)

• 1-minute instant power test for US-standard products

4. Security protection function test

Wind blocking test :

• Use dry cloth to block the air inlet and outlet until the thermal protector is activated.

• Check that the function returns to normal after cooling

• Verify that there are no dangerous phenomena such as burning and melting through

Tip-over switch test :

• Automatically power off when verifying the tilt to the specified angle

• Check that the function returns to normal after reset

• Recording of movement angle and response time

VII. Special test items and inspection methods

1. Logo durability test

IEC standard test method :

• Wipe with a damp cloth and a 1000g weight 15 times

• Use gasoline or 75% alcohol and 1000g weight to wipe 15 times

UL standard test method :

• Use your thumb to apply 18N force and wipe back and forth 10 times

Acceptance criteria : The mark is clear and readable, without curling or falling off

2. Power cord tension test

IEC standards :

• Apply corresponding pulling force 25 times according to the weight of the product

• Displacement does not exceed 2mm

UL Standard :

• Apply 35 pounds of force and hold for 1 minute

• Displacement does not exceed 1.6mm

3. Abnormal working condition test

Thermal fuse blown test :

• Short-circuit the thermostat and then power on for testing

• Verify that the thermal fuse operates correctly

• Check for fire and other dangerous phenomena

Low voltage start test :

• Low gear starting test at 85% rated voltage

• Check if the heating wire is red

• Verify startup reliability

4. Durability test

Short-term aging test :

• Continuous operation for 4 hours at rated voltage

• Check for functional abnormalities and structural deformation

• Record abnormal conditions during testing

8. Performance Testing and Inspection Verification

1. Motor speed test

• Use a tachometer to measure high-speed

• Record test data and environmental conditions

• Verify compliance with design specifications

2. Noise test

• The product is run at the highest speed without load

• Noise level measured at a distance of 1 meter

• Documenting the test environment and measurement results

3. Barcode scanning test

• Randomly select 3 color boxes for scanning test

• Verify barcode readability and information accuracy

• Recording test results

4. Packaging and transportation testing

Outer box drop test :

• Drop test according to international standards

• Check for damage to the product

• Record drop height and direction

IX. Key points of internal process inspection and product inspection

1. Electrical safety inspection

• Check the protective measures for live parts

• Verify the reliability of electrical connections

• Check wire gauge and wiring practices

2. Mechanical structure inspection

• Check guards on moving parts

• Verify the impact strength of the shell

• Check the installation and fixing methods of components

3. Component Verification

• Check the consistency of components with the list

• Check component specifications and certification marks

• Verify the correctness of the installation location and method

10. Classification of common defects and inspection judgment

1. Packaging defects

• The outer box is dirty, damaged, or poorly printed

• The color box is debonded, deformed, or poorly glued

• Missing accessories or instructions

2. Security flaws

• The power cord is the wrong size or damaged

• Failed safety test

• Defects in protective structures

3. Appearance defects

• Surface dirt, scratches, color difference

• Structural defects: shrinkage, flow marks, bubbles

• Poor electroplating, rust, and sand holes

4. Functional defects

• Switch failure, incorrect gear position

• Abnormal display, missing functions

• Abnormal noise, power deviation

11. Inspection Records and Report Requirements

1. Inspection data records

• Record all test data in detail

• Attached test conditions, equipment and environment information

• Save test photo and video evidence

2. Preparation of inspection report

• Contains product information and inspection batch

• Record inspection standards and sampling plans

• Detailed description of non-conformities and suggestions for improvement

3. Quality traceability system

• Establish product quality traceability records

• Save inspection data and test reports

• Provide quality improvement suggestions

12. Inspection Notes

1. Standard update attention

• Keep abreast of safety standards updates

• Adjust inspection standards and methods

• Update test equipment and tools

2. Seasonal considerations

• Pay attention to quality control during peak production season

• Strengthen raw material and process inspections

• Increase the frequency of sampling inspections

3. Risk Control

• Identify critical quality control points

• Establish a process for handling exceptions

• Provide preventive improvement suggestions

13. Summary

Heater inspection is a systematic quality assurance process that requires inspectors to possess specialized knowledge and extensive experience. Through rigorous inspection procedures and scientific testing methods, the safety and reliability of heater products can be ensured. Inspectors are advised to continuously learn new knowledge and promptly update inspection standards to enhance the professionalism and effectiveness of their inspection work and provide consumers with safe and reliable products.

We at China Huibang Focus specialize in product inspection and quarantine, testing and certification, supplier background checks, audits, factory inspections and other services.