Things to check (as applicable):
- Air Filter / E.A.C.
- Belts & Pulleys
- Lubrication of Motors
- Blower Wheel
- Check Thermostat
- Indoor Coil
- Motors Cleaned & Inspected
- Check Unit Wiring
- Relays and Contactors
- Inspect Disconnect
- Auxillary Heaters
- Controls & Safeties
- Test Capacitors
- Reversing Valve
- Thermostatic Expansion Valve
- Defrost Controls
- Check Condensate Drain
- Inspect Exposed Ductwork
- Refrigerant Charge (HIGH SIDE/LOW SIDE)
- Clean & Inspect Outdoor Coil