A robot that stops mid-shift is expensive, and a fault report that says “robot stopped” is almost worthless. The technician reading it has no idea which unit, which task or which of fifty possible causes to check first. If you work with robots in a warehouse, a factory or a lab, knowing how to report a fault clearly cuts downtime more than most hardware upgrades. This how-to walks through the steps, in order, for writing a robot fault report that gets action on the first reply.

Step 1: Identify the machine and the moment

Start with what and when. Name the unit by its asset tag or label, not “the one near the dock”. Add the time the problem occurred and the task it was doing: carrying a pallet, picking an item, welding a seam. Two pieces of information, the unit and the activity, let the technician narrow the problem before reading further.

If more than one robot is affected, say so up front. A fault on a single unit points toward that machine; the same fault on several at once suggests something shared, such as a network, a software update or a charging station.

Step 2: Say what the robot was meant to do

State the goal of the task in one sentence. “Move tote from lane three to the packing station” is a clear job. It tells the reader what normal looks like and what success would have been, which is surprisingly easy to forget when you are standing in front of a stopped machine.

Step 3: Write down what you have already tried

List your checks in the order you did them. Did you clear the path of obstacles? Restart the unit? Check the battery level? Re-run the task from the beginning? Each answer rules something out. Skipping this step means the technician repeats your checks, and you lose a visit. It also means they may overlook a clue, such as the fact that the fault persisted after a full restart, which suggests a hardware cause over a software glitch.

Anyone new to the machine side will find it useful to understand how the pieces fit before writing about them. A readable overview such as a primer on wiring sensing hardware into factory robots helps you name the components that might be involved.

Step 4: Describe what you expected and what actually happened

Expectation first: “The robot should have lifted the tote and travelled to the packing station in about a minute.” Then the observation, exactly as it appeared: the error code on the screen, any indicator colours, any sounds, and what the robot did. Copy codes verbatim; “some red light” does not help. If the robot gave no message at all, say that, since silence is information too.

• Exact error code or message, as displayed.
• Indicator lights and their colours or patterns.
• Whether the robot stopped, slowed or moved erratically.
• Whether the issue came on suddenly or built up over a few cycles.

Step 5: Find the smallest repeatable case

This is the step that turns a vague complaint into a solvable one. Can you make it happen again in a controlled way? Try running only the failing movement, on its own, with nothing else active. If the arm stalls only when it reaches the far end of its range, or the vehicle halts only on one stretch of floor, that is gold. Note the exact conditions: load, location, speed and any recent changes to the programme.

For vehicles, location often matters, and the way fleets plan routes is covered in a practical guide to automated guided vehicles in warehouses. For arms, check whether the fault is tied to one program step. If you are unsure how programs are structured, a simple introduction to robot programming explains what a step is and how to point to one.

Step 6: Capture the evidence

Attach what you have: a photograph of the screen, a short video of the fault, the log file for the time window, or the controller’s saved error history. Label each with the time and the unit. Do not crop out context; a wide shot that shows the surroundings is better than a tight one. If you can only attach one thing, choose the log. It usually holds the first error, which tends to be the real cause.

Step 7: State the impact and the deadline

Say what is blocked and by when it matters: “Line two is down, shipping cut-off is at four.” Be accurate. Overstating urgency makes the next real emergency harder to prioritise. Also mention any safety concern plainly and first; if a machine behaves in a way that might injure someone, stop using it and say so at the very top of the report.

Step 8: Say what kind of help you need

Do you need a fix, a replacement, or only confirmation that it is safe to continue with a workaround? State it. Technicians appreciate knowing whether to bring parts or just advice.

Put it together: a sample report

“Unit: picker arm 14, packing cell B. Time: 10:42 yesterday. Task: moving a tote from lane three to the packing station. Tried: cleared the work area, restarted the controller, re-ran the task from the first step. Expected: lift and move in about a minute. Actual: arm stops above the tote and shows error code E-47, amber light flashing. Repeatable: yes, if I run only the lift step with an empty tote; no with the grip step disabled. Evidence: photo of screen and log excerpt attached. Impact: cell B is idle; the nearest backup cell is full. Request: advice on whether the gripper sensor should be checked first.”

Read that again and notice how much a technician can do before they even arrive.

Where to see the pattern elsewhere

The same structure is common in software and operations. A public website called Debug School carries member posts about IT operations, and while robots are not its topic, reading how problems are laid out there will sharpen your own reports. The idea of describing the goal, the attempt, the expectation, the result and the smallest case applies equally to a stuck arm and a failing server.

Make it routine

Print the eight steps as a card and keep it at each cell. Better, turn them into the fields of a short form on the tablet your operators already use, so the report builds itself as they answer. Review a few reports a month with your technicians and ask which fields they find themselves chasing. Tighten the form accordingly. A fault report is only as good as the next person’s ability to act on it, and a few well-chosen questions make all the difference.