Defrost duration excessive.

A defrost cycle runs materially longer than the case's commissioned duration. A long defrost adds heat to the case and its product and wastes defrost energy, and often signals a termination-sensing or heater problem.

01 Detail

Trigger, action plan, and escalation criteria.

optimization_metric refrigeration medium managed tier AI: hybrid

Related metric: refrigeration_defrost_cycle_performance
Trigger: measured defrost duration > commissioned expected duration (start/end evidence confirmed)
Value drivers: Product loss prevention Energy savings Asset lifespan
Preconditions: Controller exposes defrost start and end with timestamps; commissioned expected duration configured per case; feed health confirmed.
Human role: Secondary review after AI validation; primary when a dispatch to the refrigeration vendor is required.
Action plan: (1) Confirm actual defrost duration from start/end timestamps against the case's commissioned expected duration. (2) Assess whether the overrun is isolated or repeating, and correlate with post-defrost case temperature. (3) Check for a termination-condition or heater fault the long duration implies. (4) Where a controllable timing parameter is exposed, correct remotely; otherwise scope a dispatch with the duration evidence.
Escalation: (1) Overruns that repeatedly push the case out of band after defrost → escalate as a product-protection issue. (2) A pattern pointing to a failed termination sensor or heater → dispatch to the refrigeration vendor within SLA.
Prevention: (1) Commission the expected defrost duration and termination condition per case so an overrun is scored against the right target. (2) Review cases with rising defrost durations at cadence — a drifting duration precedes a termination failure.