The Fault That Follows the Customer to a New Address (Decision Tree)

Why this matters

A customer moves, or replaces the equipment entirely, and calls you out for what sounds like the exact same problem they had before, at a different address or on a brand-new unit. When that happens, the fault is very unlikely to be a coincidence of two separately defective installs. It usually means the actual cause is something the customer carries with them: a habit, a maintenance gap, a piece of equipment they bring along, or a usage pattern. This tree is how you confirm that and have the conversation without insulting anyone.

Start here: confirm it is genuinely the same fault, not a similar-sounding one

Before concluding the fault followed the customer, verify the failure mode actually matches. A vague description ("it keeps breaking") can hide two unrelated issues that just feel the same to the customer.

• If the technical failure is materially different (different component, different symptom, different root cause once diagnosed), treat this as a new, unrelated issue and diagnose it fresh.
• If the failure mode, component type, and circumstances genuinely match the prior occurrence, continue.

Rule out the obvious: is it literally the same equipment

• If the customer brought the actual same piece of equipment with them (moved it to the new address, or it is under a portable/plug-in category), inspect that unit directly. A defect in the unit itself, not the site, would naturally follow it anywhere it goes.
• If the equipment is new or was left behind at the old address, the fault must be coming from something else the customer carries with them: how it is used, maintained, or set up.

Check usage pattern and habits

A large share of "it followed me" faults trace back to a specific way the customer operates or maintains the equipment, consistent across both addresses.

• Ask directly and specifically, not "do you use it correctly" but concrete questions: what settings do they run, how often do they clean or service it, do they run it a certain way at a certain time, did anyone else install or adjust anything. People rarely withhold this deliberately, they usually do not know the habit is relevant.
• If a specific habit emerges that is outside the equipment's intended use or maintenance interval (overloading it, skipping a required maintenance step, running it in a way the manufacturer does not recommend), that is very likely your root cause. Confirm by asking whether the habit was present at both addresses; if yes, you likely have your answer.
• If no clear habit emerges after a genuine, specific conversation, move to the next check rather than pressing further; a customer who feels blamed without evidence will stop being forthcoming.

Check for a shared consumable, accessory, or add-on the customer supplies

Sometimes the customer, not their habits, is supplying a specific input that causes the fault: a filter, a chemical, a specific type of fuel or fluid, an accessory purchased separately, a specific brand of consumable. If a supply the customer buys and brings with them is common to both occurrences, test or inspect a sample of it against the equipment's actual requirements.

Check for something environmental the customer's household carries with it

Less common, but real: pets that chew or nest in equipment, a household member with an unusual routine that affects timing or load, a specific chemical or product regularly used in the home that reaches the equipment (cleaning products, a workshop practice, a specific cooking or hobby activity). If the equipment fails in a pattern that fits one of these and the pattern held at both addresses, it is worth raising as a possibility.

Have the conversation without blame

Once you have a credible root cause tied to usage, a supplied consumable, or a household factor, explain it as a fit-for-use finding, not a criticism: "this fault shows up when X happens, and that is consistent with what you described at both places, here's what changes it." Offer the fix (a setting change, a maintenance interval, a different consumable, a physical safeguard) and let the customer decide. This turns a repeat callback into a customer who trusts you found the real answer.

Recap

1. Confirm the fault is genuinely the same failure mode, not just a similar complaint.
2. Rule out that it is literally the same physical unit before looking elsewhere.
3. Ask specific, concrete questions about usage and maintenance habits at both addresses.
4. Check for a consumable, accessory, or supply the customer provides themselves.
5. Consider household or environmental factors the customer carries with them.
6. Present the finding factually and offer the fix, without framing it as blame.

References

• Manufacturer documentation on intended use, maintenance intervals, and consumable specifications
• Trade-standard practice for customer intake interviews on recurring faults
• See related: It Only Fails at This One Customer (Decision Tree)