A.O. Smith Gas Water Heater BTR120

Remove outer cover plate from lower side of heater jacket

Remove six (6) hex head screws securing tank cleanout plate and remove plate

Remove lime, scale, or sediment without damaging the glass lining

Unfasten two screws to burner cover and remove it.

Locate the burner with pilot and remove screw holding burner to manifold.

Unfasten pilot tubing from valve and slide out burner and pilot.

Clean the orifice of the pilot burner.

Ensure all ignition sources are away from the faucet when turning on hot water.

Do not smoke or have open flame or sparks near the heater.

Do not mix UN•LIME with other chemicals.

Avoid contact with magnesium, aluminum, or galvanized metals.

Use rubber or neoprene gloves, especially if you have open sores or cuts.

Turn off fuel and/or power supply to the heater.

Open hot water side of faucet closest to heater and allow water to run until cool.

CAUTION: Property Damage Hazard

Ensure inspection is conducted by a qualified technician.

Verify that the water heater is out of warranty period.

Check the condition of the anode rod for corrosion or pitting.

Is the anode rod corroded or pitted?

Is the water artificially softened?

Ensure no one is in front of or around the outlet of the Temperature-Pressure Relief Valve discharge line.

Ensure water discharge will not cause any property damage.

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

Did the valve reset completely after manual operation?

Immediately close the cold water inlet to the water heater.

Replace the Temperature-Pressure Relief Valve with a properly rated/sized new one.