A.O. Smith Water Heater HW-300

Inspect all safety devices for proper operation

Is more frequent inspection required based on water conditions?

Maintenance of Low Water Cutoff Device

Flush the low water cutoff device of the float type

Ensure the protector switch reset button is not depressed

Remove leads from the switch and attach to test flashlight leads

Does the flashlight lamp light up?

Are the protector switch contacts open?

Depress reset button on switch if water temperature is below 200°F

Does the lamp light after depressing the reset button?

Pilot Burner - Electronic Ignition

Open fused disconnect switch or shut off electrical power to the boiler.

Turn the gas valve control knob counterclockwise to the 'PILOT' position.

Close fused disconnect switch to restore electrical power to the boiler.

Did the pilot ignite with the combination gas valve knob set at 'PILOT' and the system calling for heat?

Adjust pilot flame to cover 3/8" to 1/2" (10-12mm) of the sensing probe tip.

Did the main burner light after pilot ignition?

If the main burner fails to light, check the following:

Is electrical power and gas present at the valve?

Ensure the boiler is turned off and cooled down before starting the cleaning process.

Verify that all necessary cleaning solutions and tools are available.

Drain the existing water from the system completely.

Inspect the drained water for any visible contaminants or unusual color.

Calculate the approximate water volume of the system to determine the correct percentage of cleaning solution needed.

Add the appropriate amount of cleaning solution to the system.

Inspect boiler mounted gas controls for proper operation

Inspect electrical controls for proper operation

Is a more frequent inspection necessary based on water conditions?

Notes or observations from the inspection