HVAC/R Preventive Maintenance Checklist

What a good one includes

• Must include a dedicated section for recording equipment model numbers, serial numbers, and pre-service baseline operation specs to track system wear over time.
• A comprehensive electrical inspection protocol featuring amperage draws, voltage readings, and contactor condition checks to prevent sudden component failures.
• Precise testing procedures for superheat, subcooling, and system operating pressures matched to specific refrigerant types.
• Clear steps for static pressure testing, burner combustion analysis, and blower assembly inspection to ensure safe, efficient performance.
• Rigorous validation checks for safety limit switches, carbon monoxide detectors, and condensate overflow switches to protect the customer's property.
• Detailed cleaning requirements for indoor and outdoor coils, drain lines, and filter replacements to keep the system running at peak efficiency.

Common mistakes to avoid

• Using a single generic checklist for both residential split systems and commercial walk-in coolers, which leads to technicians skipping vital steps or performing irrelevant checks.
• Failing to include specific target parameters or acceptable tolerance ranges, forcing technicians to guess whether a reading is actually within normal operating limits.
• Omitting a dedicated section for customer-facing recommendations, which misses easy opportunities to upsell necessary repairs before a total system breakdown occurs.
• Neglecting to update checklists with modern regulatory compliance requirements, such as EPA refrigerant recovery protocols and state-specific safety mandates.

Frequently asked questions