Whether you need a professional technician for an E1 error code (which typically indicates an ignition failure or failure to detect a flame on gas tankless units) depends on your comfort level with basic troubleshooting. You can often resolve minor causes yourself by cleaning the flame sensor rod with fine sandpaper, checking that the gas supply valve is fully open, or clearing blocked gas lines. However, if gas control valves or electronic ignition modules are defective, hiring a professional technician is required. Verification: Reset the unit after cleaning sensor components to confirm if the E1 error code clears.
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