July 14, 2026
A forensic engineer determines why an appliance failed by documenting the scene, preserving the physical evidence, and working backward from the failure mode to the mechanism that caused it. The engineer separates the true cause from secondary damage, tests each plausible explanation against the physical facts, and states a conclusion the record can support.
What does an appliance failure investigation look at first?
The investigation starts with the scene, not the part. Where the appliance sat, how it was installed, what surrounded it, and what burned or broke first all shape the answer. A forensic engineer photographs the appliance in place before anything moves, records model and serial numbers, and notes the position of switches, valves, and controls. Utility connections matter: the gas line, the water supply, and the electrical circuit each carry information about how the appliance was operating at the moment it failed.
Context prevents early mistakes. A dishwasher that leaked and a dishwasher that ignited leave different marks, and the surrounding cabinetry, flooring, and adjacent outlets often record which one happened. The engineer also gathers the appliance's history: age, prior repairs, recalls, and how the owner used it. Those facts narrow the list of possible causes before a single component is examined closely.
How is the physical evidence preserved?
Evidence handling decides whether a conclusion holds up. Once the appliance is documented in place, it is removed carefully so that fracture surfaces, burn patterns, and electrical arcing are not disturbed. The engineer maintains a written chain of custody from the scene to secure storage, because an adjuster or attorney will eventually need to show the item was not altered.
Preservation also protects other parties. When a product defect is possible, the manufacturer, the retailer, and any repair contractor have a right to inspect the same evidence. A forensic engineer coordinates joint examinations and documents each step so the analysis can be repeated. Discarding a burned control board or cleaning a corroded valve can end a subrogation claim before it starts, so nothing is altered without a record and, where needed, agreement among the parties.
How does an engineer find the failure mode?
The core work is failure-mode analysis: identifying exactly how the component gave way and then tracing that failure to its origin. The engineer examines fracture surfaces, heat damage, electrical arcing, wear, and corrosion, often under magnification. Each observation points toward a category of cause: a manufacturing defect, a design flaw, improper installation, misuse, ordinary wear, or an outside event such as a power surge or water intrusion.
The method is elimination against evidence. The engineer lists every cause that could plausibly produce the observed failure, then tests each one against the physical facts. A cause that cannot explain the burn pattern, the direction of a crack, or the sequence of damage is set aside. When fire is involved, origin and cause work follows NFPA 921, which requires the same disciplined, evidence-based reasoning rather than assumption. What remains is a mechanism the evidence actually supports.
This is where the difference between symptom and cause becomes decisive. A melted wire may be the result of a fire rather than its source. A cracked housing may follow the failure rather than trigger it. A forensic engineer distinguishes the two by reading the sequence the damage records. For complex products, this connects to broader product failure investigations that apply the same discipline across appliances, components, and electrical systems.
Who calls a forensic engineer, and why?
Insurance adjusters call when a claim turns on why a product failed. If an appliance may have caused a fire or water loss, the answer decides whether the carrier pays, denies, or pursues the manufacturer through subrogation. A defensible engineering opinion gives the adjuster a basis for that decision and a record that withstands challenge.
Attorneys call when the failure becomes the subject of litigation. In a product liability or subrogation case, both sides retain engineers, and the analysis must survive cross-examination and opposing review. A forensic engineer prepares reports, supports depositions, and testifies as an expert witness, explaining technical findings in terms a judge or jury can follow. Because ESI has investigated over 5,000 properties and works through licensed Professional Engineers and NAFI-certified fire investigators, the conclusions rest on method rather than opinion.
What makes a conclusion defensible?
A defensible conclusion is repeatable. Another qualified engineer, given the same evidence and documentation, should be able to follow the reasoning and reach the same result. That standard drives every earlier step: thorough scene work, disciplined evidence handling, and failure-mode analysis that tests each possibility rather than settling on the first plausible one. The engineer states what the evidence shows, notes what it cannot show, and stops there.
ESI serves insurance adjusters and attorneys nationwide and has applied this method to forensic engineering and fire investigation since 1991. If you have an appliance or component failure that a claim or case depends on, contact us for a free consultation to discuss how the evidence can be examined.
