Fan Coil Unit Maintenance Checklist

🔧 Monthly Tasks

☐ Filter Inspection

• Clean washable filters with mild detergent
• Replace disposable filters (if clogged)
• Tip: Hold filter up to light – if you can’t see through it, replace it!

☐ Airflow Check

• Verify all vents are unobstructed
• Listen for abnormal fan noises (scraping, rattling)

☐ Drain System

• Pour 1 cup vinegar down drain line to prevent algae
• Confirm condensate flows freely (check outdoor drain outlet)

🔩 Quarterly Tasks

☐ Coil Maintenance

• Vacuum fins with soft brush attachment
• Spray coil cleaner (non-acidic) if buildup exists
• Warning: Never use pressure washers – fins bend easily!

☐ Mechanical Components

• Lubricate motor bearings (if applicable)
• Check belt tension (for belt-driven units)

☐ Control Test

• Cycle through all thermostat modes (heat/cool/fan)
• Verify actuator valves open/close properly

📆 Annual Tasks

☐ Water System Service

• Flush pipes with system cleaner (remove scale/sludge)
• Test water pH (ideal: 7.0-8.5 to prevent corrosion)

☐ Electrical Safety

• Tighten all terminal connections
• Measure voltage/amperage (compare to nameplate)

☐ Ductwork Audit

• Inspect for leaks (hold tissue near seams – if it flutters, seal leak)
• Check insulation integrity

🚨 Troubleshooting Quick Reference

💡 Pro Maintenance Tips

1. Seasonal Prep
   • Before cooling season: Clean coils + check refrigerant charge
   • Before heating season: Bleed air from pipes + test valves
2. Record Keeping
   • Log all maintenance with dates (helps warranty claims)
   • Take before/after photos of coils for comparison
3. Energy Efficiency
   • Dirty coils increase energy use by up to 30%
   • Consider upgrading to ECM motors for 50%+ energy savings

📥 Downloadable Version: [FCU Maintenance Checklist PDF] (Let me know if you’d like this formatted as a printable PDF!)

🚑 When to Call a Pro:

• Water leaking inside walls/ceiling
• Burnt electrical smells
• Repeated ice buildup on coils

Regular maintenance can extend FCU life by 5-10 years and prevent 80% of common breakdowns.