Start with food safety. Check an appliance thermometer; USDA recommends a refrigerator temperature of 40°F or below. Follow its guidance for time, temperature and the particular food rather than tasting food to test it.
Record useful details
- What temperature is shown on an independent thermometer?
- When did the change start?
- Are both refrigerator and freezer affected?
- Is an error code displayed?
- What are the brand and model number?
Use the manufacturer’s instructions
Check ordinary user settings and care instructions for the exact model. Do not remove panels, work on live wiring or open refrigerant lines. Ask a qualified provider to assess the fault.