Goodman Gas-Fired Warm Air Furnace AKSS90453BX

Turn on the furnace at the thermostat

Allow several minutes for flames to stabilize

Are the flames stable and quiet?

Do the flames extend directly outward from the burners without curling, floating, or lifting off?

Do the flames impinge on the sides of the heat exchanger firing tubes?

Turn OFF electrical power to furnace

Remove filter(s) from the central return register or ductwork

Replace filter(s) by reversing the procedure for removal

Turn ON electrical power to furnace

Filter Type and Size Verification

Is the filter properly installed and secured?

Turn OFF the electrical power and gas supply to the furnace

Disconnect the gas line and remove the burner/manifold assembly

Disconnect the flue pipe system from the induced draft blower

Remove the induced draft blower and the drain and pressure tap hoses from the recuperator coil front cover

Remove the recuperator coil front cover to expose the coil tubes and turbulators

Remove the recuperator coil turbulators individually

Check for blockage in the flue pipe system.

Check for leakage in the flue pipe system.

Inspect the outside termination of the flue pipe.

Inspect connections at and internal to the furnace.

Check for corrosion within the heat exchanger passageways.

Check for buildup within the heat exchanger passageways.