Use 5 Whys on Repeat HVAC Callbacks
Apply 5 Whys to identify a controllable root cause behind repeat callbacks.
Unit 9D has three AC callbacks in 21 days. Each ticket says cooling restored, but the resident keeps losing cooling overnight. 5 Whys: symptom -> process cause -> controllable fix The common trap is to blame the vendor or resident after the second callback without changing the diagnostic process. Why 1 Why did 9D call again? The AC stopped cooling overnight after a prior same-day restore. Start with the resident-observed failure, not with a theory about who caused it. Why 2 Why did cooling stop after restore? The coil froze again after several hours of operation. A repeated condition points…
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