HAACP advise you double check your cold room temperature when storing food or other temperature critical products:

It is always good to double check the operation of your critical food safety equipment. Simply relying on a display unit may cause food safety issues related to stored food if the temperature display unit is faulty.

Easily verify the food cold room temperature

The easiest and quickest way to check the actual temperature inside of your food cold room is to:

Step 1: Place a cup or container of water inside of your cold room. Leave this cup there for at least 24 hours. This will allow the water to chill to the temperature of the room.

Step 2: Write down the temperature as shown on the cold room temperature display unit.

Step 3: Place the probe of a hand-held calibrated thermometer into the water. Note down the temperature reading for the water.

Step 4: Compare the results from the two different sources.  Take corrective action if needed.”

Also ensure your cold room doors close tightly and are not left open for pro-longed periods causing variable temperatures in the room.