You ordered electronic products from a Chinese manufacturer. The goods arrived, but your quality inspection revealed a problem: some units failed electrical safety tests, others overheated during operation, and a percentage of the batch did not meet the agreed performance requirements.
You notified the manufacturer. Its response was unexpected.
The supplier argued that the products had passed its own factory inspection. It questioned your testing method, suggested that the samples were unrepresentative, or claimed that the failures resulted from your testing equipment rather than its manufacturing process.
Meanwhile, your business cannot simply ignore the results. You may have customers waiting for delivery, a product launch approaching, or distributors refusing to accept the shipment.
At this point, the dispute is no longer just about product quality. It concerns what the manufacturer promised, whether the failed tests establish a contractual breach, how much of the shipment is affected, and which remedy is commercially and legally justified.
The most important question is not simply whether the products failed a test. It is whether the test demonstrates a failure to meet the requirements the manufacturer agreed to satisfy.
That distinction can determine whether a buyer has a strong basis for demanding repairs, replacement products, a price reduction, a refund, or compensation for additional losses.
1. A Failed Test Is Not the Same as a Proven Contract Breach
Electronic products can be tested in many ways. Depending on the product, testing may cover electrical safety, electromagnetic compatibility, operating temperature, charging performance, battery endurance, signal stability, power consumption, or long-term reliability.
A product may pass one test and fail another. It may also pass a test under one set of conditions but fail under a different operating environment.
This creates a potential dispute when the buyer and manufacturer rely on different testing criteria.
Imagine that a European importer orders power adapters from a Chinese manufacturer. The purchase order specifies the output voltage and rated power, while a technical attachment refers to a safety standard. After delivery, an independent laboratory reports that several units fail a temperature-rise test.
The manufacturer responds that its own inspection confirmed the output voltage and rated power were within specification.
Both statements may be factually correct. They address different requirements.
The manufacturer’s argument about electrical output does not necessarily answer the temperature-rise issue. Equally, the buyer’s test report does not automatically establish that every unit in the shipment is defective.
The first task is to identify the exact requirement that was allegedly violated.
Four questions should be answered
- What was agreed? Identify the applicable technical specifications, test methods, safety requirements, performance criteria, and acceptance conditions.
- What failed? Determine the precise test, the measured result, the permitted limit, and the number of units affected.
- Was the test conducted properly? Review the testing conditions, equipment, sample identification, calibration information, and laboratory methodology where relevant.
- What does the failure mean commercially? Establish whether the products are unsafe, unusable, repairable, or merely outside a contractual tolerance.
This analysis prevents a broad quality complaint from obscuring the actual contractual issue.
It also helps the buyer distinguish a manufacturer’s failure to comply with an agreed requirement from a test that introduces a new requirement the supplier never accepted.
2. The Manufacturer Says Its Own Quality Control Passed the Products
A common response from a Chinese electronics supplier is that the products passed its internal quality control before shipment.
That claim deserves examination, but it is not conclusive by itself.
A factory inspection may focus on appearance, basic functionality, or a limited number of electrical measurements. The buyer’s contract may require more extensive performance testing or compliance with a specified technical standard.
For example, a Bluetooth device might power on and pair successfully during a factory check but suffer intermittent disconnections during extended operation. A battery-powered product may function normally during a short inspection but lose capacity much faster than the agreed specification allows.
The important issue is what the factory inspection was designed to establish.
Compare the two inspection processes
The buyer should compare the supplier’s inspection records with the contractual requirements and the failed test results.
Relevant differences may include:
- The tests actually performed by the factory
- The tests required by the purchase order or technical specification
- The number of units inspected
- The operating conditions used during testing
- The duration of the test
- The acceptance limits applied
- Whether the failed characteristic could reasonably have been detected by the supplier’s inspection process
A factory report showing that products passed a basic power-on test does not necessarily prove compliance with a separate endurance or safety requirement.
On the other hand, if the buyer relies on a testing criterion that was never incorporated into the agreement, the supplier may have a legitimate contractual defense.
The aim is not to dismiss the factory’s records, but to determine whether they answer the actual question in dispute.
3. What If the Laboratory Report and the Contract Do Not Match?
Independent laboratory testing can be valuable, particularly when the manufacturer disputes the buyer’s inspection results. However, a laboratory report must be interpreted in the context of the contract.
A report may identify a failure under a particular test standard. The next question is whether that standard was contractually required, legally applicable to the product, or otherwise relevant to the parties’ obligations.
These are related but distinct issues.
Contractual standards and regulatory requirements are not interchangeable
A buyer may have agreed to a specific technical standard in the contract. Separately, the product may be subject to mandatory regulatory requirements in the destination market.
A product that satisfies the manufacturer’s internal specification may still fail a mandatory safety requirement. Conversely, a product that passes a regulatory test may not meet every additional performance requirement agreed between the buyer and seller.
The legal analysis should distinguish between:
- Contractual nonconformity: The product fails a requirement that the manufacturer agreed to meet.
- Regulatory noncompliance: The product fails a mandatory requirement applicable to the product or its intended market.
- Commercial underperformance: The product does not perform as the buyer expected, but the expectation may not have been clearly incorporated into the contract.
The same product may fall into more than one category, but the evidence and legal consequences can differ.
Check the testing method before relying on the result
If the manufacturer challenges the laboratory report, the buyer should review the test protocol, sample identification, equipment, environmental conditions, and relevant measurement limits.
For complex electronics, seemingly small differences can affect the outcome. A battery test may depend on the discharge rate and temperature. A thermal test may depend on ventilation and load. Wireless performance may vary with interference and the test environment.
This does not mean that every supplier objection is valid. It means that a buyer should be able to explain why the chosen test reliably evaluates the requirement in question.
Where the amount in dispute is substantial, a technically independent assessment may help establish whether the disagreement concerns a real product defect, an inappropriate test method, or a difference in interpretation.
4. A Small Failure Rate Can Still Create a Large Commercial Problem
Suppose a buyer imports 5,000 electronic controllers. An inspection identifies 3% of sampled units as failing a functional test.
The manufacturer may argue that the failure rate is too low to justify rejecting the shipment. The buyer may respond that even a small proportion of defective controllers could cause expensive failures after installation.
Neither position should be accepted without examining the relevant facts.
The significance of a failure rate depends on the type of failure, the inspection method, the intended use, the contract’s acceptance criteria, and the reliability of the sampling process.
A minor cosmetic defect is different from a defect that creates a risk of overheating or electrical malfunction. A small number of failures in a carefully selected sample may also indicate a broader production problem—or may not, depending on the sampling design and the characteristics of the batch.
Do not confuse the sample failure rate with the entire batch failure rate
If 3% of inspected units fail, that does not automatically prove that exactly 3% of the entire shipment is defective.
The result may be statistically informative if the sampling method is appropriate, but its reliability depends on how the samples were selected, the size of the sample, and whether the production batch is reasonably consistent.
Buyers should preserve the inspection plan, sample selection records, serial numbers, batch numbers, photographs, and test results.
Where the failure could create a safety risk, the buyer should also consider whether further distribution or use should be paused while the risk is assessed. Any product recall, customer notification, or regulatory reporting obligation must be evaluated separately under the applicable rules.
Why the type of defect matters more than the percentage alone
Consider two different findings:
- Three units have minor cosmetic scratches that do not affect functionality.
- Three units exhibit a fault that may cause a battery to overheat during charging.
The numerical failure rate is the same, but the commercial and safety implications are very different.
A buyer should therefore avoid basing a refund demand solely on the percentage of failed units. The nature of the failure and its consequences are often more important.
5. Intermittent Failures Are Particularly Difficult to Prove
Not all electronic defects are visible when goods arrive.
Some products work normally during a short inspection but fail after repeated charging cycles, extended use, exposure to heat, vibration, or changes in power supply.
Other failures are intermittent. A device may function correctly in the factory but lose connectivity, reset unexpectedly, or generate abnormal readings after operating for several hours.
These cases create an evidentiary challenge because the manufacturer may be unable to reproduce the reported problem—or may argue that the buyer’s equipment, installation, or operating environment caused it.
A useful investigation should go beyond recording that a product “does not work.”
Reconstruct the conditions under which the failure occurs
The buyer should document:
- The product model and hardware revision
- The firmware or software version, where relevant
- The serial numbers and production batch
- The power supply and operating conditions
- The time elapsed before the failure
- The steps required to reproduce the problem
- The measured output or error message
- Whether the failure occurs across multiple units
If the failure occurs only after a certain operating period, the test should record that period. If the problem occurs only with a particular accessory or power source, that relationship should be investigated rather than ignored.
These details can help distinguish a manufacturing defect from an installation error, compatibility issue, software problem, or misuse.
They can also help determine whether the manufacturer supplied goods that failed the agreed requirements or whether further technical investigation is needed before liability can be assessed.
6. Could the Problem Be Caused by Components Supplied by a Third Party?
Electronic manufacturers frequently source batteries, chips, connectors, displays, sensors, power modules, and other components from third parties.
When a product fails testing, the manufacturer may argue that a component supplied by another company caused the problem.
That explanation does not automatically resolve the contractual dispute in the manufacturer’s favor.
The relevant question is what the manufacturer agreed to deliver and which party assumed responsibility for selecting, integrating, and verifying the components.
For example, a buyer contracts with a Chinese manufacturer to supply a finished battery-powered device. The manufacturer selects the battery supplier and assembles the finished product. During testing, the device fails to meet the agreed endurance requirement.
The manufacturer may argue that the battery supplier is responsible. However, if the manufacturer’s obligation was to deliver a finished device meeting the specified endurance requirement, the buyer may still have a contractual claim against the manufacturer, depending on the agreement and applicable law.
The buyer should distinguish between the manufacturer’s responsibility to the buyer and any separate claim the manufacturer may have against its component supplier.
The position may differ where the buyer itself nominated the component supplier, supplied the components, or expressly accepted responsibility for their suitability.
Relevant documents include the bill of materials, component specifications, approved supplier lists, incoming inspection records, integration test results, and communications allocating responsibility for component selection.
This issue is especially important when a manufacturer tries to redirect the buyer to a component supplier with whom the buyer has no direct contractual relationship.
7. Should You Reject the Entire Shipment or Accept the Conforming Units?
When a batch fails quality testing, buyers often face a difficult commercial choice: reject everything, accept the units that pass, or require the manufacturer to correct the defective portion.
The appropriate choice depends on more than the number of failed units.
If the defects are isolated and can be reliably corrected, replacing or repairing the affected units may be more economical than rejecting the entire shipment.
However, if the defect reflects a common design or production problem, accepting the apparently conforming units may expose the buyer to future failures. A short inspection may not detect a latent defect affecting the entire batch.
The buyer should consider the following factors:
- Whether the failed units can be identified and separated
- Whether the defect is likely to affect apparently conforming units
- Whether repair or replacement can reliably achieve compliance
- Whether the contract contains batch-rejection or acceptance provisions
- Whether the goods have already been installed, resold, or used
- Whether continued use could create a safety risk
- The cost and delay associated with each available option
Acceptance of part of a shipment may be commercially sensible, but the buyer should document the arrangement carefully. It should be clear which units are accepted, which remain disputed, who bears the cost of correction, and whether accepting one portion affects the buyer’s rights concerning the rest.
A buyer should also avoid signing an unconditional acceptance document if unresolved defects remain, unless the legal and commercial consequences have been considered.
The objective is not to reject as much as possible. It is to preserve a defensible position while selecting a remedy that addresses the actual problem.
8. Rework, Replacement, or Refund: Which Remedy Makes Sense?
A manufacturer may offer to repair the products, replace the defective units, or provide a discount. A buyer may prefer a refund because confidence in the supplier has deteriorated.
The best option depends on whether the manufacturer can realistically deliver conforming products and whether the proposed remedy addresses the buyer’s losses.
Rework
Rework may be suitable where the defect is limited, the cause is understood, and the correction can be verified.
For electronic products, however, rework can create additional questions. Replacing a component may affect reliability, safety certification, firmware compatibility, or the product’s expected service life.
Any corrective plan should specify the work to be performed, the acceptance criteria, the inspection method, the deadline, and the allocation of costs.
Replacement
Replacement may be preferable where the defective units cannot be reliably repaired or where the buyer needs a fresh production batch.
The buyer should clarify whether the replacement products will be manufactured using the same components, design, and production process that caused the original failure. If the root cause is not corrected, replacement may simply reproduce the problem.
Refund or contract termination
A refund or termination claim may be appropriate in more serious cases, subject to the contract and applicable law.
Relevant considerations include the severity of the breach, whether the goods can be made compliant, whether the failure defeats the commercial purpose of the contract, and whether the contractual requirements for termination have been satisfied.
The buyer should not assume that any failed test automatically justifies termination of the entire order. Nor should it assume that the manufacturer’s offer to repair always prevents a refund claim.
The practical question is whether the proposed remedy provides the contractual performance that was promised within a commercially reasonable framework.
9. How to Calculate and Prove Losses Beyond the Purchase Price
The purchase price may be only one part of the buyer’s financial exposure.
A shipment of defective electronic products may generate costs for independent testing, sorting, repair, replacement production, expedited freight, customer returns, or installation work.
Some buyers may also face contractual penalties or claims from their own customers. Whether those losses can be recovered from the Chinese manufacturer depends on the contract, applicable law, causation, foreseeability, evidence, and any enforceable limitations of liability.
A useful claim should separate each category of loss instead of presenting a single unexplained figure.
| Loss category | Potential supporting evidence |
|---|---|
| Inspection and testing | Laboratory invoices, test reports, inspection instructions |
| Sorting and rework | Labor records, repair invoices, work orders |
| Replacement procurement | New supplier quotations, purchase orders, payment records |
| Additional logistics | Freight invoices, expedited shipping records |
| Customer-related losses | Customer claims, contractual penalties, correspondence |
| Project delay | Project schedules, installation records, documented delay costs |
These records do not automatically establish that every expense is recoverable. They help demonstrate that the expense occurred and provide a basis for assessing its connection to the alleged breach.
The buyer should also examine whether the contract excludes particular categories of loss, caps liability, requires prompt notice of defects, or specifies an agreed remedy for nonconforming products.
Where losses are substantial, a lawyer can help distinguish legally supportable damages from commercial losses that may be difficult to recover.
10. What If the Manufacturer Blames Your Testing Equipment or Operating Environment?
A supplier may argue that the products failed because the buyer used the wrong test equipment, an unsuitable power source, an incorrect firmware version, or operating conditions outside the agreed range.
Such defenses should be assessed objectively.
The buyer should check whether the testing setup complied with the relevant protocol and whether the operating conditions matched the product’s contractual specifications.
For example, if a product is rated for a particular voltage range, testing it outside that range may not establish a manufacturing defect. But if it fails within the agreed range, the manufacturer needs more than a general allegation about the buyer’s equipment to explain the result.
Where appropriate, the parties may agree to repeat the test under a jointly documented protocol or use an independent laboratory.
A repeat test should not simply erase the original findings. The original report, failed samples, test conditions, and subsequent results should all be preserved so that any difference can be evaluated.
If the manufacturer requests that the goods be returned for investigation, the buyer should consider whether the original evidence needs to be preserved first. Depending on the product and the dispute, this may involve photographs, serial-number records, diagnostic logs, independent testing, or a documented chain of custody.
The aim is to establish a reliable technical record—not merely to produce a test result favorable to one side.
11. How to Make a Formal Claim Against a Chinese Electronics Manufacturer
If direct discussions do not produce a workable solution, the buyer may need to make a formal contractual claim.
Before sending a demand, identify the actual contracting entity. A trading company, manufacturing factory, brand owner, and payment recipient may be different entities. The company that appears on the product packaging is not necessarily the party legally responsible under the sales contract.
The buyer should also review the contract’s governing-law and dispute-resolution clauses before deciding how to proceed.
A well-prepared demand should explain:
- The contract and the technical requirements that apply.
- The products, production batches, and specific failures involved.
- The test results and other supporting evidence.
- Why the failures constitute nonconformity under the agreement.
- The remedy requested and the basis for calculating the amount.
- Any corrective action already requested or attempted.
- A reasonable deadline for the manufacturer’s substantive response.
The demand should address the manufacturer’s likely defenses where the evidence allows. If the manufacturer claims that its own inspection passed, explain which contractual requirement that inspection did not address. If it challenges the laboratory method, identify the relevant protocol and evidence supporting the test. If it blames a third-party component, clarify the manufacturer’s obligations under the contract.
A formal demand can create a structured opportunity for settlement. It does not guarantee that the manufacturer will pay, and the buyer should avoid making unsupported allegations or demanding losses that cannot be substantiated.
12. When Should You Consider Litigation or Arbitration in China?
If negotiations fail, the appropriate legal route depends on the contract, the applicable law, and the dispute-resolution provisions.
Some international manufacturing contracts contain arbitration clauses. Others provide for court proceedings or leave important procedural questions unresolved.
The buyer should review the exact wording rather than assume that it can sue in its home country simply because it purchased the goods from there.
Arbitration
If there is a valid and applicable arbitration agreement, arbitration may be the required or appropriate forum.
The buyer should confirm the named arbitral institution, the scope of the clause, the seat of arbitration, the applicable rules, the language, and the expected costs.
Arbitration may be useful for cross-border commercial disputes, but it is not automatically the least expensive or fastest option.
Court proceedings
Depending on the contract and applicable jurisdictional rules, court proceedings in China or another legally appropriate forum may be available.
The buyer should assess the proper defendant, the evidence needed to prove the technical failure, the applicable procedural requirements, and the realistic prospects of enforcing a judgment or award.
Technical disputes can require more than a contract and a payment receipt. The buyer may need to preserve samples, obtain expert evidence, prove the relationship between the failed products and the claimed losses, and address competing technical explanations.
Evaluate the economics before proceeding
The amount in dispute is only one part of the decision. The buyer should also consider the manufacturer’s financial circumstances, the cost of legal proceedings, the value of the goods that remain usable, the cost of replacement procurement, and the likely enforceability of any decision.
For a relatively small order, a negotiated price adjustment or replacement arrangement may be commercially preferable. For a large shipment involving safety concerns or significant downstream losses, a more formal legal strategy may be justified.
The decision should be based on the evidence and expected commercial outcome, not solely on the desire to establish that the manufacturer was at fault.
13. When Is a China Lawyer Worth Hiring?
A Chinese lawyer may be particularly helpful when:
- The contract and technical specifications conflict.
- The manufacturer disputes the validity of an independent test report.
- A safety-related defect has been identified.
- The parties disagree about whether the whole batch or only part of it is defective.
- The manufacturer blames a component supplier or the buyer’s testing process.
- Tooling, production records, or technical files are being withheld.
- The buyer seeks compensation beyond the purchase price.
- The contract contains an arbitration or jurisdiction clause that needs careful review.
- Informal negotiations have failed and a formal demand or legal proceeding is being considered.
The lawyer’s role may include reviewing the contract, identifying the applicable technical obligations, assessing the evidence, evaluating possible defenses, and helping the buyer determine which remedies are legally and commercially realistic.
A lawyer may also help prepare a formal demand, support settlement negotiations, or assess whether litigation or arbitration is proportionate to the amount at stake.
Legal advice is particularly valuable before the buyer makes an irreversible decision, such as disposing of the defective products, accepting a final settlement, terminating the contract, or signing a document that may affect its rights.
No lawyer can guarantee a refund or compensation. The outcome depends on the contract, the applicable law, the quality of the evidence, the manufacturer’s circumstances, and the availability of effective enforcement.
Conclusion: Turn the Failed Test Into a Specific, Evidence-Based Claim
When a Chinese electronics manufacturer delivers products that fail quality testing, the buyer should resist two opposite mistakes.
The first is assuming that one failed test automatically entitles the buyer to reject the entire shipment and recover every related expense. The second is accepting the manufacturer’s assertion that its factory inspection passed the products as a complete answer to the complaint.
The more effective approach is to identify the exact contractual requirement, establish what failed and under which conditions, determine whether the defect affects individual units or the wider production batch, and assess which remedy addresses the actual commercial problem.
Depending on the facts, the appropriate response may be rework, replacement, a price reduction, a refund, contract termination, or a claim for proven damages.
The strength of a quality dispute depends not only on the test result, but on the connection between the agreed requirement, the technical evidence, the manufacturer’s contractual obligations, and the remedy being claimed.
Lyu & Associates assists international businesses with disputes involving Chinese manufacturers, including contract review, evidence assessment, refund and damages claims, formal demand letters, commercial negotiations, and the evaluation of litigation or arbitration options.
If your shipment has failed quality testing, organizing the contract, test reports, sample records, and communications before escalating the dispute can help establish a clearer and more defensible course of action.
The information provided in this article is for general informational purposes only and does not constitute legal advice. Laws and legal procedures may vary depending on the specific facts and applicable jurisdiction. No lawyer-client relationship is created by reading this article or contacting us through this website. For advice regarding a specific matter, please consult a qualified lawyer after a formal engagement has been established.
Legal Contributors
Legal professionals contributing to this article and related legal analysis.
Qiang Lyu
His practice also includes China company law, intellectual property matters, and commercial contract disputes involving foreign-invested businesses and cross-border commercial activities.