When a machine suddenly starts during maintenance and injures someone, workers’ compensation may cover the job injury, but that doesn’t always mean workers’ comp is the only legal option for a work injury.
That’s the part many injured workers don’t hear about right away.
Pennsylvania workers’ compensation usually prevents an employee from filing an ordinary negligence lawsuit against the employer. But that protection generally doesn’t extend to an outside company that helped cause the accident.
So, if you were injured by machine startup, the real question becomes broader.
Did the machine fail because of a defective component? Did an independent contractor wire something wrong? Did someone bypass a safety interlock? Was the equipment designed in a way that allowed stored energy to move unexpectedly? Those details can turn a basic workers’ comp claim into a separate third-party work injury claim.
Pennsylvania Work Injuries
OSHA has estimated that proper lockout/tagout procedures prevent about 120 deaths and 50,000 injuries every year. That alone shows how serious a hazardous energy control failure can be.
A 2025 incident in Bucks County also showed how devastating machinery accidents can become. CBS Philadelphia reported that a 68-year-old man died after his arm became caught in a woodchipper in Lower Southampton Township. The report didn’t determine whether a defect, a contractor’s mistake, or a maintenance problem caused the accident.
That distinction matters.
In a serious case, the machine itself needs to be investigated.
Machine Liability and Maintenance Injuries
Machine maintenance liability may extend beyond the employer when defective industrial equipment or an outside company contributes to an unexpected startup.
Sometimes the problem is obvious. Other times, it’s buried inside a control system.
Potential equipment problems may include:
- Defective interlocks
- Broken emergency stop systems
- Bad electrical
- Missing or broken guards
- Failed energy isolation parts
- Hydraulic pressure that wasn’t properly released
- Pneumatic systems that could still cycle
- Unsafe modifications made after the machine left the manufacturer
Suppose a maintenance worker shuts down a packaging machine and follows the normal lockout process. Then part of the machine suddenly cycles because stored pneumatic pressure was never properly isolated. That’s not necessarily just a worker mistake.
In fact, it may point to an unsafe design, defective component, or incorrect modification.
That’s where an industrial machinery injury lawsuit may reach beyond workers’ compensation.
Employer Negligence and Lockout Tagout Violations
Employer lockout/tagout mistakes usually fall within workers’ compensation, but they can still reveal how the accident happened and whether another company shares responsibility.
OSHA maintenance safety standards require employers to control hazardous energy during servicing and maintenance. That means more than shutting off the power switch. A proper lockout process should isolate those sources and verify that the machine can’t restart before maintenance begins.
If that process fails, records may help explain why, and those documents may show workplace safety negligence.
They may also reveal that an outside contractor created or contributed to the problem.
Third-Party Liability for Defective Machine Design
Third-party liability can exist when a machine manufacturer or component company supplies equipment that’s defective and unsafe during normal maintenance.
That can create a legal route around the workers’ comp bar.
Potential defendants may include:
- The company that manufactures the machine
- Parts and component manufacturers
- Equipment distributors
- Automation companies
- Control system designers
- Equipment installers
Imagine a machine that’s supposed to disable movement when a guard opens.
You open the guard during maintenance; the interlock fails, and the machine moves while you’re still in the danger zone. That kind of failure raises a completely different issue from an employee forgetting to follow procedure.
The investigation may focus on whether the design was safe, whether the interlock was defective, or whether the manufacturer gave adequate instructions for isolating stored energy.
That’s the core of defective industrial equipment litigation.
Negligence by Outside Contractors or Technicians
An outside contractor may be legally responsible when bad repair work, faulty programming, or improper installation causes a machine to start unexpectedly.
Industrial plants rely heavily on outside specialists. Suppose a contractor replaces part of a safety circuit but reconnects wrong. The machine appears normal. Then, during the next maintenance shutdown, the interlock doesn’t isolate the equipment, and you get hurt.
That may support a separate third-party work-injury claim against the contractor, but you could still receive workers’ comp through your employer.
Those are different claims against different parties.
Proving Fault in Unexpected Machinery Startup Cases
Proving fault means preserving the machine and figuring out exactly why energy reached it during maintenance.
That needs to happen quickly. Production sites often want damaged equipment repaired and back in operation as soon as possible. Once parts are replaced or programming is changed, important evidence may disappear.
A Philadelphia industrial accident attorney may also work with engineers who can inspect the machine and test the energy isolation system.
That technical analysis can help separate several possibilities.
- Was it employee error?
- A defective product?
- Bad programming?
- A maintenance mistake?
Or was it several problems at once?
That answer often determines whether a third-party case exists.
Hurt by a Machine During Maintenance? Laffey Bucci D’Andrea Reich & Ryan Can Help
A machine starting during maintenance doesn’t always create a workers’ comp-only case.
Sometimes the bigger legal issue sits outside the employer. Maybe a manufacturer designed an unsafe system, a contractor bypassed a safety device, or a technician wired an interlock incorrectly.
A component may simply have failed.
At Laffey Bucci D’Andrea Reich & Ryan, we understand that, which is why we believe that machine maintenance liability needs a wider investigation. The strongest case doesn’t stop at asking if you were hurt. It asks who designed, installed, programmed, repaired, and maintained the systems that were supposed to keep the machine from moving in the first place.
If you’ve been injured by a machine at work, contact us today, and let’s start asking the right questions.