Troubleshooting a non-functional tankless water heater requires a systematic inspection of its basic operating utilities. Prerequisite: Ensure power and gas supply lines are active. First, check the digital control display panel for any active numerical error codes that pinpoint specific component faults. Next, verify that the incoming gas supply shut-off valve and cold water inlet valve are fully open. Clean the cold water inlet filter screen if it is clogged with hard water mineral debris, and power cycle the unit by unplugging it for 60 seconds to reset the computer control board. Verification: Open a hot water tap to confirm whether the error code clears and burners ignite normally.
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