Level/check operation of thermostat |
Tighten all electrical conections |
Replace/wash air filters |
Inspect visible line set for crimping |
Clean dust/lint build up on return grille |
Check/repair suction line insulation |
Check voltage/amperage to fan motor* |
Check disconnect for overheating |
Check voltage/amperage to blower |
Check fuse holders for tightness |
Check voltage/amperage to compressor* |
Inspect evap drain pan for holes/leakes |
Clean condenser coil as needed* |
Add algae tablets to drain pan |
Clean evaporator coil as needed |
Check all relays for proper operation |
Check refrigerant charge* |
Check delay timer for proper operation |
Record temperature drop across coil* |
Purge/vacuum condensate drain lines |
Record temperature rise in heat |
Vacuum out heat exchanger |
Clean air cleaner cells, if applicable |
Inspect secondary heat exchanger |
Check reversing vlave operation |
Verifiy operation of hot surface igniter |
Inspect/replace blower belt |
Clean off flame sensor |
Clean exterior of unit |
Check for proper defrost operation |
Clean burner bars, if removable |
Clean debris out of condensing unit |
Inspect wiring for cuts and fraying |
Check for carbon monoxide |
Inspect/clean blower wheel as needed |
Check and adjust gas pressure |
Inspect fan blade for cracks/balance |
Verify proper inducer motor operation |
Inspect motor mounts for tightness |
Verify pressure switch operation |
Perform visual refrigerant leak check |
Check/set thermostat anticipator |
Tighten schrader cores |
Check fan/limit control settings |
Check contractors for burning/pitting |
Check for combustibles near furnace |
Lube fan/blower motors (if lubed type) |
Visually inspet exterior of flue pipe |