Yes, an E1 error code on a tankless water heater is a serious safety and operational fault that requires prompt attention, as it signifies an ignition failure or loss of flame detection during startup. When this error triggers, the unit's electronic control board shuts down the gas supply to prevent unburned gas accumulation. While it can sometimes be caused by a simple closed gas valve or a dirty flame sensor, ignoring it leaves you without hot water and could indicate a failing gas valve. Verification: Check gas supply valves and inspect the flame sensor rod for carbon soot accumulation.
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