Resetting a tankless water heater depends on its electronic control interface, but the standard universal method involves power cycling. Prerequisite: Ensure no active water flow is running through the system. Locate the dedicated power ON/OFF switch connected to the unit or unplug the power cord directly from the electrical wall outlet. Leave the power disconnected for 30 to 60 seconds to allow the internal digital circuit board capacitors to discharge fully and clear computer memory. Many modern units also feature a dedicated reset button on the digital monitor interface. Verification: Check the digital display panel after turning power back on to confirm that error codes have disappeared and normal operation resumes.
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