To clear an E1 error code, which indicates an ignition failure or failure to detect a flame on gas tankless water heaters, you must first address the root cause and then reset the system. Prerequisite: Ensure the main gas supply valve is fully open and supplying adequate pressure. Next, power cycle the tankless unit by turning off its dedicated power switch or unplugging the power cord for 60 seconds, then turning it back on to clear electronic memory. If the error persists, clean the flame sensor rod with fine sandpaper to remove carbon soot. Verification: Check the digital display panel after power cycling to confirm the E1 error code has cleared and burners ignite.
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