Select the clean feature on your iron if the steam is leaving deposits or sputtering when using the steam feature. If your iron does not have this feature, empty out the water in the reservoir and fill with white distilled vinegar and water.
Let the iron sit for approximately half an hour to soften the deposits. Then plug in the iron and while the iron is sitting upright, select the steam feature. This will clean out any mineral deposits left by hard water. Use caution when you do this--the water will be extremely hot. Repeat this application several times to completely remove the mineral deposits.
Check the electrical cord if the indicator light on the iron is not lighting. Look for breaks or worn spots on the cord. If the bare wires are not showing, use electrical tape to cover the areas. If the wires are showing, it's recommended to get a new power cord for your iron.
Check the outlet with a voltmeter or check the circuit breaker box to make sure the circuit has not been tripped, if the light on your iron still does not light. If you are using a GFI outlet, press the reset button, and plug in the iron again.
Unplug the iron when repairing the sole plate. If the sole plate is leaving marks clean it with a soft cloth and baking soda. If the sole plate is nonstick, use a soft cloth and soapy water. Then rinse thoroughly.
Consult a repairman if the indicator light is burnt out or the iron is not heating up evenly. It's worth the investment if the iron is reasonably new; however, if the iron has a few years on it, consider purchasing a new iron.