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The A.O. SMITH 100076318 is an ignitor rod kit designed as a direct replacement component for select A.O. SMITH water heaters. The ignitor rod is the spark-generating element responsible for lighting the burner assembly during each firing cycle. When this component fails, the burner will not ignite and the unit will not produce hot water. This kit is installed by licensed plumbers or water heater service technicians during routine maintenance or troubleshooting of no-heat and ignition-fault service calls. Replacing the ignitor rod restores reliable burner ignition and returns the unit to normal operation.
This ignitor rod kit is compatible with specific A.O. SMITH T-H3M-series water heater models, including both direct-vent and outdoor configurations running on natural gas or liquid propane. It is suited for residential water heater service where the original ignitor rod has degraded, cracked, or failed to produce a consistent spark. Technicians performing annual maintenance or responding to ignition fault codes will find this a straightforward component swap on supported units.
Confirmed compatible with the following A.O. SMITH water heater models: T-H3M-DV (NG), T-H3M-OS (NG), T-H3M-DV (LP), and T-H3M-OS (LP).
Installation should be performed by a licensed plumber or qualified water heater technician. Before servicing, shut off the gas supply and disconnect electrical power to the unit to prevent accidental ignition or shock hazard. Allow the unit to cool before accessing the burner assembly. Follow all applicable local codes and the manufacturer service documentation when replacing ignition components.
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