Check and level TSAT

Replace standard air filter

Clear condensate line

Check temp rise / drop

Clean blower vents

Check blower amp readings

Check blower capacitor

Check electric heat strips (Heating mode only)

Clean condenser coils (Cooling mode only)

Clean debris from outdoor unit

Clean oxidation from outdoor unit cover

Check refrigerant levels

Clean super heat and subcooling

Check contactor for pitting

Check outdoors capacitors

Clean electrical compartment

Check and tighten electrical connections

Check outdoor motor bearings

Check amp readings on compressor and outdoor motor

Compressor meg readings

Check disconnect box

Clean furnace compartment

Clean furnace casing

Clean and check flame sensor

Check and test igniter / pilot

Replace standard style air filter

Check furnace safety controls

Check blower capacitor

Check motor amp readings

Check blower capacitor (Note: This is repeated on the original list)

Check blower speed

Check motor vents

Check heat exchanger for cracks

Pill blower motor assemble to access heat exchanger (80% heaters only)

Check combustion reading

Check temp rise against manufacturer specs

Check gas pressure

Check and level TSAT

Visual inspection of burners

Clear condensate trap (90% heaters only)

Check and tighten electrical connections

Check for flue obstruction and proper venting

Pull and clean burner tubes

Clean boiler cabinet

Clean burner compartment

Check igniter / pilot

Clean and check flame sensor / thermocouple

Check combustion readings

Check safety switches and controls

Check and tighten electrical connections

Check water temp

Check water pressure

Check and drain expansion tank

Visual inspection for water leaks

Check and adjust gas pressure

Check and lube circulator

Check flue for obstructions and proper venting

Check to see if all rooms are heating

Check for air in the lines

Check and level TSAT

Check heat exchanger for leaks

Check zone values

Check auto vents

Replace oil filter

Replace air filter

Replace pump strainer

Replace oil nozzle

Adjust electrodes

Check and adjust pump pressure

Clean vents on air band

Adjust air band settings

Clean furnace cabinet

Clean furnace casing

Check combustion readings

Check safety switches and controls

Check and tighten electrical connections

Check blower amp readings

Check blower vents

Check blower capacity

Check temp rise

Check heat exchanger for cracks

Check flue for obstructions and proper venting

Vacuum flue breach

Check and level TSAT