RentersPass.org has a sample maintenance checklist to prevent breakdowns and to schedule your maintenance requests. Here are some checks for air-conditioners and other safety items
Check air-conditioner:
- Remove leaves and debris
- Check the refrigerant
- Check evaporator drain
- Clean evaporator and condenser coils
- Straighten the fins
- Lubricate moving parts
- Change return air filters
- Clean vents and diffusers
- Clean exhaust vents in kitchen, bathrooms, laundry
- Check the furnace
- Test smoke, CO alarms
- Check fire extinguishers
- Prevent broken pipes in vacant units
- Inspect roofing and siding
- Check and clean gutters and downspouts