E19 error and the unit indicates an internal software fault.

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

Corrupted firmware on Clearwater control board, Interrupted firmware update, Severe electrical surge

Safety first: Unplug the unit before handling the control board.

Power cycle: Disconnect power for at least 5 minutes, then reconnect to see if the controller recovers.
Factory reset: Perform a full factory reset and reprogram all settings.
Firmware update: If Clearwater provides firmware updates via service port or SD/USB, follow official instructions to reload the firmware.

If E19 persists after reloading firmware (or if updates are not user-accessible), the Clearwater control board must be replaced.

Hard 4/5

Clearwater main control board

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