Final answer:
If a pressure fryer makes a grinding sound, the Cook/Pump switch should be turned off immediately and the filter control handle or wing nut should be adjusted as needed.
Step-by-step explanation:
If a pressure fryer makes a grinding sound, it is important to turn the Cook/Pump switch to the off position immediately. This noise is usually an indication that the filter control handle is not in the proper position or that the filter wing nut is either too tight or too loose. Before continuing, it is crucial to address the correct situation to ensure the fryer operates correctly.