Weekly, by your own staff
- Wipe door seals and check they close cleanly along the full length.
- Confirm the controller display matches an independent thermometer.
- Keep airflow clear — never stack stock against the evaporator.
- Log temperatures at the same time each day.
Quarterly, by a technician
- Clean the condenser and evaporator coils.
- Check refrigerant pressures, superheat and subcooling against design.
- Test the defrost cycle end to end, including drain flow.
- Inspect door heaters, hinges, closers and safety release.
- Verify probe calibration and controller settings.
- Record all readings so drift is visible over time.
Why it matters commercially
Documented temperature logs and service records are the evidence you need in a food-safety audit, and they are the fastest way to shorten diagnosis time on a future breakdown.