VRF Maintenance Checklist
What should be inspected, cleaned, and tested during a professional VRF maintenance visit. Use this to hold your service provider accountable.
Not all VRF maintenance visits are created equal. A technician who changes filters and leaves is not performing maintenance. This checklist reflects what a proper, factory-spec VRF maintenance visit should include—consistent with the scope defined in ASHRAE Standard 180: Standard Practice for the Inspection and Maintenance of Commercial Building HVAC Systems.
Outdoor Unit
- Condenser coil cleaning with chemical treatment and proper rinse direction
- Condenser fan motor inspection (bearings, blade condition, amp draw)
- Compressor amp draw measurement and comparison to nameplate
- Compressor vibration check for bearing wear indicators
- Refrigerant pressure and temperature readings (suction, discharge, liquid)
- Subcooling and superheat calculations to verify charge
- Inverter board thermal scan for hot spots
- Electrical connection torque verification on all terminals
- Control board visual inspection for capacitor swelling or burn marks
- Communication bus voltage and signal integrity test
- Outdoor unit cabinet inspection (corrosion, panel integrity, critter intrusion)
- Drain pan and base pan inspection and clearing
Indoor Units (Each Unit)
- Filter cleaning or replacement
- Indoor coil inspection and cleaning if needed
- Drain pan inspection and condensate line clearing
- Electronic expansion valve (EEV) operation test
- Fan motor operation check (speed, noise, vibration)
- Return air temperature sensor verification
- Remote controller function check
- Airflow direction and louver operation verification
System-Wide
- Error history download and trend review
- Runtime hour logging
- Control system firmware version check
- Schedule and setpoint verification against building requirements
- BMS communication verification (if integrated)
- Written condition report with findings and recommendations
Maintenance scope based on ASHRAE Standard 180 (Standard Practice for Inspection and Maintenance of Commercial Building HVAC Systems) and manufacturer service manuals for Daikin VRV and Mitsubishi City Multi equipment.
Want This Done Right?
Mountain Mechanical performs every item on this checklist during our maintenance visits. Contact us for a service agreement.