A.O. Smith Water Heater HWB-610 Natural

Turn off the electrical power, main manual gas shutoff, and pilot valves, if applicable.

Allow boiler parts and vent to cool before disassembly.

Remove the boiler draft diverter and vent pipe running to the chimney.

Check parts and chimney for obstructions and clean as necessary.

Remove burner from boiler and other metal parts as required to clean and vacuum the heat exchanger and combustion coils.

Reinstall the parts removed in steps 2 and 3.

Ensure the protector switch reset button is not depressed

Remove leads from the switch and attach to test flashlight leads

Testing with Model N22T Test Kit

Are the protector switch contacts open?

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

Ensure the circulator pump is turned off

Verify that the oil tube is available and in good condition

Identify the oil cups to be lubricated

Add 2 or 3 teaspoons of No. 20 non-detergent motor oil to the pump oil cup

Add 10 or 12 drops of No. 20 non-detergent motor oil to each motor oil cup

Is there any oil leakage around the cups?

Ensure a drain line is attached to the valve to direct discharge to an open drain.

Lift the lever at the end of the valve several times to ensure it seats properly and operates freely.

Did the relief valve discharge periodically or continuously?

If the valve discharged, describe the potential cause (e.g., thermal expansion or faulty valve).

Shut off electric and gas supply to the unit

Remove pressure relief valve from outlet header assembly and install drain hose assembly

Install standpipe in tee of inlet line