What Happens If a PCB Fails? (Product Liability Explained)

Introduction

Printed circuit boards (PCBs) sit at the heart of most modern products — from industrial controls and EV chargers to medical devices and consumer electronics. When a PCB fails, the impact can be small (a device stops working) or serious (a fire, an electric shock, corrupted data, or a safety-critical system behaving unpredictably).

For manufacturers, importers, and brands selling into the UK, the bigger question is often: what happens next — and who carries the legal and financial risk? This article breaks down what PCB failure can trigger in the real world, how product liability works in the UK, and what practical steps reduce both claims and disruption.

What “PCB failure” can look like in the real world

A PCB can fail in different ways, and the type of failure often shapes the severity of the claim.

Common outcomes include:

• Device stops functioning (no power, intermittent faults, boot loops)
• Overheating and thermal events (burning smell, melted housings, smoke)
• Short circuits and arcing (damage to nearby components, fire risk)
• Incorrect outputs (wrong sensor readings, incorrect dosing/controls)
• Data loss or corruption (especially in connected devices)
• EMC issues (interference causing other equipment to malfunction)

In safety-critical environments — healthcare, manufacturing, transport, energy, construction sites — a “simple” PCB fault can become a bigger incident because it triggers downtime, safety issues, or damage to third-party property.

Typical causes of PCB failure (and why liability can follow)

From a claims perspective, the cause matters because it points to whether the issue is:

• a design problem,
• a manufacturing/assembly defect,
• a component quality issue,
• a testing/quality control gap, or
• a misuse/installation issue.

Common causes include:

• Design errors: inadequate creepage/clearance, poor thermal design, under-rated traces, weak protection circuits.
• Manufacturing defects: solder voids, cold joints, insufficient reflow profiles, contamination.
• Component failures: counterfeit parts, out-of-spec batches, capacitor ageing, semiconductor defects.
• Environmental stress: moisture ingress, vibration, corrosion, conductive dust.
• Firmware/software interaction: control logic causing unsafe states, watchdog failures, update issues.
• Inadequate instructions: unclear installation guidance, missing warnings, incorrect torque specs or enclosure requirements.

Even if you outsource PCB assembly, the brand placing the product on the market can still face the claim first — and then seek recovery from the supply chain.

What happens immediately when a PCB fails (practical chain of events)

In many businesses, a PCB failure triggers a predictable sequence:

1. Customer complaint or incident report

• Anything involving smoke, heat, shock, injury, or property damage escalates quickly.

1. Quarantine and evidence capture

• The failed unit (and sometimes the whole batch) should be isolated.
• Keep packaging, serial numbers, batch codes, installation photos, and any logs.

1. Initial technical triage

• Determine whether it’s isolated or systemic.
• Check whether the failure mode could repeat.

1. Decision point: stop-ship / field action

• If risk is credible, you may need to pause shipments, notify distributors, or issue a safety notice.

1. Root cause analysis (RCA)

• Often involves X-ray, microscopy, thermal imaging, firmware review, and supplier traceability.

1. Customer remedy

• Repair, replacement, refund, or on-site service.

1. Potential escalation

• Claims for property damage, injury, business interruption, or recall costs.

The key is that the costs start long before a lawsuit. Investigation, logistics, and customer management can be the biggest drain.

Product liability in the UK: the simple explanation

“Product liability” is the legal responsibility for harm caused by a defective product.

In the UK, claims can arise under:

• Consumer Protection Act 1987 (CPA): introduces strict liability for defective products causing injury or property damage (meaning a claimant does not always need to prove negligence).
• Negligence: where a party failed to take reasonable care.
• Contract law: warranties, supply agreements, and terms of sale.

For many PCB-related incidents, the claim may be framed as: the product was not as safe as people are generally entitled to expect.

Who can be liable if a PCB fails?

Depending on how the product is sold and branded, liability can sit with:

• Manufacturer of the finished product
• PCB designer (if separate)
• Contract manufacturer/assembler (PCBA)
• Component supplier
• Importer bringing goods into the UK
• Brand owner whose name is on the product
• Distributor/retailer (in some scenarios)

In practice, the claimant often targets the party that is easiest to identify and has assets/insurance — commonly the brand owner or UK importer.

What losses can a PCB failure claim include?

A PCB failure can lead to several categories of cost:

1) Injury claims

If a failure causes electric shock, burns, or other injury, claims can include:

• medical costs
• loss of earnings
• legal fees
• compensation for pain and suffering

2) Third-party property damage

Examples:

• a device overheats and damages a customer’s equipment
• a control board causes a motor to run incorrectly and damages machinery
• a fire damages a building

3) Product recall and field correction costs

Even without injury, you may face:

• customer notifications
• shipping and collection
• disposal and replacement
• engineer call-outs
• rework and retesting

4) Business interruption and contractual penalties

For B2B customers, a failure can trigger:

• downtime claims
• liquidated damages
• contract termination
• reputational harm

5) Regulatory and compliance costs

If the product is regulated (for example, medical devices), you may need:

• incident reporting
• corrective actions
• additional testing and documentation

Special note: medical devices and safety-critical electronics

If your PCB sits inside a medical device, the stakes are higher because failures can affect patient safety.

In the UK, medical devices must meet the relevant regulatory requirements (including UKCA marking and quality management expectations). A PCB fault that changes performance, alarms, or dosing/control behaviour can trigger:

• formal vigilance reporting
• field safety corrective actions
• deeper scrutiny of design controls, supplier management, and traceability

Even where the PCB is only one part of the system, investigators will look at whether risks were identified and controlled.

How to reduce liability risk after a PCB failure

When something goes wrong, your response matters. Good practice includes:

Preserve evidence

• Keep failed units intact where possible.
• Record serial numbers, batch codes, and installation conditions.
• Capture customer statements and photos early.

Communicate carefully

• Acknowledge the issue without admitting legal liability prematurely.
• Use clear safety guidance if there is any risk of harm.

Run a structured RCA

• Document your process and findings.
• Track component lots, assembly dates, and test results.

Check your documentation

• Risk assessments
• test reports
• instructions and warnings
• change control records

Review supply chain contracts

• warranties and indemnities
• limits of liability
• responsibilities for recall costs

Insurance: what covers can help if a PCB fails?

Insurance doesn’t stop a failure — but it can protect cashflow and keep the business trading.

Common covers to discuss with a broker include:

• Product Liability: covers injury or third-party property damage caused by your product.
• Public Liability: covers injury/property damage arising from your business activities (not always product defects).
• Professional Indemnity (for designers/consultants): covers claims arising from design advice, specifications, or professional services.
• Product Recall / Product Contamination (where available): can cover recall logistics and associated costs.
• Cyber Insurance: relevant for connected devices where a fault leads to data loss, security issues, or business interruption.
• Directors’ & Officers’ (D&O): can be relevant where decisions around safety, disclosure, or governance are challenged.

The right mix depends on whether you design, manufacture, import, or simply brand and distribute.

Practical steps to reduce the chance of PCB failure (and strengthen your defence)

Insurers and investigators often look for evidence of good controls. Practical steps include:

• Clear design standards (thermal margins, protection circuits, creepage/clearance)
• Supplier vetting and counterfeit part controls
• Incoming inspection and traceability
• Process controls for assembly (reflow profiles, cleaning, conformal coating where needed)
• Environmental and stress testing that matches real use
• Firmware update controls and rollback plans
• Clear installation instructions and warnings
• Batch/serial tracking and field monitoring

If a claim happens, being able to show a disciplined approach can reduce the severity and improve outcomes.

FAQs

If a PCB fails, am I automatically liable?

Not automatically — but you may still face a claim. Under UK strict liability rules, a claimant may not need to prove negligence if the product is considered defective and caused injury or property damage.

What if the failure was caused by a component supplier?

You may still be the first target for the claim (especially if you are the brand owner or importer). You can then pursue recovery from the supplier depending on your contracts and evidence.

Does a recall always mean the product is “defective”?

A recall or field action is often a risk-control step. It can be sensible even when the root cause is still being confirmed.

What if the customer installed it incorrectly?

Misuse or incorrect installation can be a defence, but only if your instructions and warnings were clear and reasonable, and the product was otherwise safe.

Will product liability insurance cover replacing my own products?

Often, product liability focuses on third-party injury/property damage. Recall costs and replacing your own products may require specific extensions or separate recall cover.

Conclusion: plan for failure, not just performance

PCB failures are not only technical problems — they can become legal, financial, and reputational events. The best protection is a mix of strong design and quality controls, clear documentation, and a response plan that preserves evidence and protects customers.

If you manufacture, import, or sell electronics in the UK — especially in medical technology or other safety-critical sectors — it’s worth reviewing your product liability exposure and making sure your insurance and contracts match the real-world risk.

Need help reviewing your product liability cover for electronics or medical devices? Speak to Insure24 for a practical, UK-focused review and a quote tailored to how you design, build, and supply your products.