Atlantic water heater shows E41; unit may not fill or may shut down.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Stuck flow switch, scaled flow sensor, wiring fault, incorrect installation direction, failed sensor electronics

Safety: Isolate power and close water supply before removing any hydraulic components.

Locate the flow sensor or flow switch on the cold water inlet line of the heater.
Check installation orientation (arrow direction) and correct if installed backwards.
Remove the sensor body and inspect for scale or debris preventing movement; clean gently without damaging internal parts.
Check the sensor wiring and connector to the control board; repair any damage.
If the sensor still does not signal flow correctly, replace it with the appropriate Atlantic flow sensor.

Hard 4/5

Flow Sensor / Flow Switch

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