Apply Five Whys to a repeat field failure and identify a controllable process cause.
A customer's ice machine fails every Monday after passing repair on Friday. Five Whys: keep moving from symptom toward a controllable cause. The common trap is stopping at the first human-sounding answer, such as the technician did not check it properly. That may be true, but it rarely creates a durable countermeasure. Why 1 Why did the customer reopen the ticket Monday? The freeze cycle tripped after weekend demand. Start with the observed failure, not a theory about the technician. Why 2 Why did the freeze cycle trip? Condenser pressure rose above the safe range under sustained load. Move from…
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