Do not diagnose a container-related temperature deviation by guesswork. FAO recommends documenting monitoring and corrective actions in process control. First locate the deviation in the record, then check the items below against that time.
Preparation
- If the deviation appears as loading begins, compare the recorded starting temperatures of the container and load. Complete preparation under the model instructions.
- If plate readiness is uncertain, check the plate model’s readiness criterion and freezer record instead of relying on touch or shaking. Hold it from dispatch if the criterion is unmet.
- If plates are stacked or airflow is blocked, compare the rack layout with the instructions; correct spacing and orientation as specified there.
Loading and delivery
- If the load leaves its target range, compare the plate identity with the product’s target temperature and model selection. If they do not match, prepare the load again with a suitable plate.
- If the recorded rise lines up with stops, compare door openings with the delivery schedule. Reduce unnecessary openings and record how long the door stays open.
- If the load shows a local freeze mark or contact trace, inspect how plates relate to the packaging and rail; adjust placement according to the product and model instructions.
- If the container is distorted or compressed, inspect storage and vehicle stacking. Do not load anything on top until the model instructions confirm stacking is allowed.
Keep the temperature record with the corrective action. This makes it possible to see whether a recurring deviation starts during preparation or use.
