Resolving an E1 ignition failure error code on a tankless water heater involves verifying gas supply and cleaning flame sensors. Prerequisite: Ensure all safety equipment is utilized and power is disconnected before servicing. Verify that the gas shut-off valve is fully open. Access the internal burner chamber and clean the flame sensor rod with fine sandpaper to remove insulating soot. Inspect the igniter sparking mechanism for loose wiring connections or excessive gap spacing. Power cycle the unit by unplugging it for 60 seconds. Verification: Open a hot water tap and observe the digital display to confirm normal burner ignition without an E1 code recurrence.
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