About.com has guides for troubleshooting water heater problems and guidelines for performing some repairs. HomeTips.com also lists steps that can help homeowners diagnose and fix water heater problems.
Operation manuals often have advice for maintaining and inspecting water heaters, and manuals typically list how to solve certain problems. Newer water heaters sometimes have a digital panels that lists problems with the heater, and these panels often display codes if a problem is detected. Fault codes vary by manufacturer, but manuals often contain a list of what they mean. Before attempting repairs, ensure that the gas valve is shut off on gas units and that power is disconnected to both gas and electric units.