What is the first action to take if the walk-in refrigerator is not maintaining the correct temperature?

The first action to take if the walk-in refrigerator is not maintaining the correct temperature is to ensure the walk-in door is closed tightly. A properly sealed door is essential for maintaining the internal temperature of the refrigerator, as any gaps can allow warm air to enter, leading to inadequate cooling and food safety concerns. By securing the door, you can quickly determine if that was the cause of the temperature issue.

Checking the power supply and inspecting the temperature gauge are important steps to follow, but they are secondary actions that come after ensuring the door is sealed. Turning off the walk-in temporarily would not be advisable as a first step, because doing so would effectively stop all cooling efforts and could further exacerbate the temperature problem. Ensuring a secure door closure is the most immediate and simple measure to take, potentially resolving the issue without further action.