When to check heating mode on a refrigerated unit in winter

Do not assume a unit can heat on a winter route. Check its manual, the cargo temperature range, sensor position and low alarm threshold before dispatch.

12 January 2023Updated 23 September 2026

Short answer

Verify that the exact unit model supports heating using its manual; set the target range and low alarm limit from the cargo requirement. Check that the sensor represents the load, test the logger before dispatch and measure the product at delivery. If an alarm or reading is out of range, assess the cargo before continuing shipment.

Include the gap between ambient conditions and the cargo's target range in winter dispatch planning. Heating may not be available on every model or configuration; do not assume the feature from the vehicle panel alone.

Pre-dispatch checks

Verify the heating function in the operating manual for the exact model and equipment. Get the product's applicable temperature range and any preconditioning step from the shipment instruction. Set the low alarm threshold to match that requirement; one limit does not suit every product.

Check the sensor position and logger operation. An air reading inside the body is not the same as the product's core temperature; record the initial and final measurement points, time and device ID on the form.

If a low alarm or out-of-range reading occurs en route, document the event and follow the company's cargo assessment procedure. Review the product and records together at delivery; do not infer damage or compliance from one air reading.

Sources and correction policy for this article

Topics:Fleet and refrigeration units Food quality and shelf life Risk and emergencies

Fleet & service workshops →