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The hi-limit switch is a safety device that cuts power when fryer temperature exceeds safe limits. Common causes: faulty thermostat allowing oil to overheat, failing hi-limit switch itself, improper temperature settings, low oil level exposing heating elements, or carbon buildup insulating heating elements. Never bypass the hi-limit switch — it prevents fires. Call a technician to diagnose the root cause.

Preventive maintenance frequency depends on the equipment and usage volume. As a general guideline: fryers and ovens should be inspected every 3-6 months; refrigeration equipment annually or semi-annually; ice machines every 6 months (including cleaning and sanitizing); exhaust hoods quarterly to semi-annually per NFPA 96; and dishwashers quarterly. High-volume operations benefit from more frequent service intervals.

Installation time varies significantly: single appliance with existing connections 2-4 hours; single appliance requiring new utility connections 4-8 hours; full kitchen buildout 1-3 weeks depending on scope, permit timelines, and contractor scheduling. Work with your installer to create a realistic timeline that accounts for utility work, inspections, and health department walkthroughs before opening.