This video provides step-by-step instructions for replacing the igniter and flame sensor on AO Smith gas water heaters. The most common reason for replacing the igniter and flame sensor is when the water heater does not light or does not heat.
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Additional water heater repair, troubleshooting tips, help finding your model number, and part replacement videos: http://www.repairclinic.com/RepairHelp/Water-Heater-Repair-Help?TLSID=1879
All of the information in this igniter and flame sensor replacement video is applicable to the following brands: AO Smith