E17 displayed and the unit reports low salt or salt not detected despite salt being present

Safety first: Disconnect power before working inside the brine tank.

• Visually confirm salt: Open the brine tank and check whether salt is actually present around the sensor area. Top up with the recommended tablet or block salt if low.
• Break salt bridge: If there is a hard crust above an empty void, gently break it up so salt can fall into the water.
• Reposition sensor: Ensure the salt sensor or float is correctly located per Monarch instructions and is not stuck against the tank wall.
• Clean sensor: Wipe the sensor with a damp cloth to remove heavy salt deposits.
• Reset alarm: After correction, clear the E17 alarm via the control panel. If it returns, the sensor may need replacement.