Cold-Chain Temperature Excursion NZ: Assess the Deviation

A cold-chain temperature excursion is a departure from the conditions intended for the food. For a New Zealand manufacturer, distributor or storage operator, the key questions are what happened, which food was exposed and what evidence supports the next decision.

This guide concerns assessment after a deviation, such as an alarm, delivery concern or refrigeration failure. It is separate from designing routine temperature logs or choosing a registration category. It supplies a practical review brief, not a product-release protocol.

Control affected product while the event is assessed

A temperature alarm, warm delivery or refrigeration failure needs a response through the business’s applicable food safety arrangements. Restore suitable conditions where appropriate, identify potentially affected food and prevent unintended use or dispatch while its status is assessed. Do not wait for a complete technical report before managing an immediate concern.

The Codex General Principles of Food Hygiene separates bringing a process back into control from isolating affected product, evaluating safety and suitability, deciding its disposition, identifying the cause and preventing recurrence. Codex is international technical guidance; it does not replace the New Zealand requirements, registered plan or programme applying to your operation.

A repaired chiller answers an equipment question. The food that was in it still needs a documented decision based on its actual exposure and relevant controls. Similarly, moving a pallet into another cold room may help restore control without establishing that its earlier history was acceptable.

Reconstruct the time and temperature history

Preserve the original logger export, alarm history and relevant manual records. Record when the event was detected, who responded, what was observed and what actions changed the conditions. Keep the original data alongside any working graph or summary.

We recommend making a simple chronology with evidence for each entry: the last reliable in-control observation, the first evidence of a problem, movements or door openings, checks during the event, recovery and any subsequent handling. Distinguish a measured time from an estimate and identify gaps rather than filling them with assumed values.

• Identify the device, its location, the parameter measured, units and relevant accuracy or calibration information. Say whether a record concerns room air, vehicle air, a surface or the food itself.
• Check logger clock settings, time zone, recording interval and any known data gaps. Keep different devices’ timelines aligned without overwriting their original files.
• Link readings to actual product positions and movements. Explain whether the logger travelled with the load or stayed in one location.
• Retain delivery, loading, stock-transfer, power, maintenance and alarm-response records where relevant. Record when product entered or left the affected area.
• Describe what cannot be established, including an unknown start time or an unrecorded period before delivery.

Do not relabel an air reading as a measured product temperature. A later spot check describes that measurement at that time; it does not reconstruct every earlier condition. These are practical evidence-review precautions, rather than a substitute for a suitable monitoring method.

Identify which products and quantities may be affected

Connect the event to product names, batch or lot codes, quantities, locations and current stock status. Include ingredients and part-used materials where they were exposed. Establish whether any affected food has been processed further, transferred or dispatched, and retain the links to resulting batches.

Avoid assuming that every item in a room had the same history or that the pallet closest to a sensor defines the entire event. Different arrival times, positions, packaging and movements may need consideration. Record the evidence behind any proposed boundary and what information might widen it.

The RMP cold-store receipt, stock-status and dispatch records guide covers routine stock links. For this incident, use those links to assemble the affected-product picture. If the issue arose during transport, the NP1 transport temperature and delivery records guide addresses that particular programme’s routine records; it does not supply a universal excursion decision for all food businesses.

Use the criteria applying to the actual food and operation

Start with the current plan or programme, relevant process or storage controls, product specification and any applicable customer or market requirements. Find the actual limit and corrective-action procedure for this situation. A customer acceptance condition and a food safety limit may have different purposes; record both rather than silently substituting one for the other.

Codex explains that time and temperature controls should consider the nature of the food, including pH and water activity where relevant, the microorganisms of concern, intended shelf life, packaging, processing and intended use. It recommends defined tolerances and validated controls, with monitoring and recording as appropriate and instruments checked for accuracy.

This is why a familiar time rule, a generic chiller setting or a limit copied from another product is not enough to decide every excursion. A ready-to-eat product, an ingredient receiving a later validated process and a product with different growth characteristics need their relevant evidence assessed. This guide deliberately gives no general permitted excursion duration or release temperature.

MPI states that transport and storage requirements depend on the products, handling activities and market. Confirm the relevant requirements before choosing the assessment criteria. Where a specified procedure requires rejection or disposal, do not replace it with an improvised judgement simply because the food looks acceptable.

Agree a competent assessment and a clear disposition

Give the responsible technical person the product information, actual temperature history, scope, criteria and uncertainties together. Ask which questions can be resolved from existing evidence and what further input is justified. Do not commission a test or model first and decide what it was meant to establish afterwards.

A useful assessment explains the concern being considered, the evidence relied on, assumptions, limitations and the reasoning for the proposed disposition. Keep safety, suitability and commercial acceptance distinguishable. An adverse appearance may be useful evidence, but a normal appearance is not a documented assessment of every relevant hazard.

Codex recognises that external experts may be needed when evaluating product after a deviation. Depending on the circumstances, outcomes can differ. Do not assume that recooling, freezing, cooking again or shortening the date is an acceptable correction without a justified basis and the necessary authority. The applicable plan, product, process and regulatory arrangements govern what is possible.

The written decision should identify the exact products and quantities covered, their final status, who authorised the action and how it was implemented. Keep unresolved product under effective control. If evidence remains insufficient, say so; an incomplete history should not be converted into a confident pass by leaving the uncertainty out.

Keep incident reporting separate from the stock decision

If food may already have moved beyond the business’s control, assemble the distribution evidence promptly and follow the applicable incident and reporting arrangements. MPI’s food recall guidance for businesses explains holding product, tracing potentially affected batches, informing the appropriate people, assessing risk and deciding whether a recall is required. It advises contacting the verifier or New Zealand Food Safety if investigation is difficult or delayed.

An internal hold, traceability work, withdrawal, recall and required notification are different actions. A temperature alarm does not automatically establish that a recall is necessary, and it should not automatically be dismissed as a quality issue. The assessment and applicable requirements determine the response; a consulting enquiry does not replace timely required reporting.

Keep an accurate record of advice, communications and decisions. Identify which information was available at the time and update the response if new evidence changes the affected scope or risk assessment.

Prepare a focused temperature-deviation review brief

We recommend sending an indexed first brief rather than an unexplained spreadsheet of temperatures. Include:

• The business, site, product, activity and applicable plan or programme.
• The decision needed and current product hold, movement and distribution status.
• Product and batch identifiers, quantities, packaging, intended use and relevant shelf-life information.
• Original readings, device details, time settings, accuracy information and the event chronology.
• Applicable limits, specifications, corrective-action procedures and existing supporting evidence.
• Actions already taken, people informed, advice received and remaining uncertainties.
• The requested output, responsible business decision-maker and any real deadline.

Agree the scope before work begins: document review, an onsite assessment, control review, further specialist input or corrective-action support may answer different needs. AFVA’s food safety and quality consulting service includes reviewing temperature records, non-conforming product controls and corrective actions. Its HACCP consulting service includes control-measure, monitoring, corrective-action and existing validation-evidence review.

Confirm competence, availability and responsibilities for the particular event. The support described here is consulting; it is not a guarantee of product release, an emergency response service, regulatory approval or laboratory analysis.

Close the cause and check the corrective action

After the product response, investigate why the deviation occurred and why it was not prevented or detected earlier. Depending on the evidence, questions may concern equipment, loading, alarm settings, handovers, maintenance, monitoring placement or staff instructions. Record the supported cause and retain unresolved questions.

Assign actions, owners and completion dates, then check whether the changes work under the relevant operating conditions. A repair invoice alone does not show that monitoring, alarm response and product controls now work together. Review related events for trends rather than treating repeated excursions as unrelated paperwork.

• Avoid deleting logger data after preparing a graph.
• Avoid describing estimates as measured times.
• Avoid using one acceptable later reading to close an earlier data gap.
• Avoid restoring equipment without recording what happened to the affected food.
• Avoid selecting a universal time allowance without checking the applicable product and controls.
• Avoid closing corrective actions before checking implementation and effectiveness.

Frequently asked questions

General information only. Suitable action depends on the food, exposure, applicable regulatory and customer requirements, plan or programme and supporting evidence. This article does not authorise release, reprocessing, relabelling or disposal, or replace required incident reporting.