Display shows E1 and the softener does not start regeneration

Safety first: Close the main water supply to the softener before disconnecting any hoses. Depressurize by opening a nearby tap.

• Check inlet valve: Verify the BWT softener’s dedicated inlet shutoff valve is fully open. Many BWT units have a bypass/inlet lever on the connection block; ensure it is in the Service position, not Bypass or Closed.
• Inspect inlet hose: Look for kinks, sharp bends, or crushed sections on the flexible hose feeding the BWT valve head. Straighten or replace if damaged.
• Clean inlet filter: At the softener’s inlet union, BWT typically uses a small stainless-steel mesh filter. Shut off water, unscrew the union, carefully pull out the filter screen, rinse under running water, and brush off debris. Reinstall and tighten without overtightening.
• Check mains pressure: Ensure household water pressure meets BWT’s minimum (often around 1.5–2.0 bar). If pressure is low, the unit may not detect flow. Consult a plumber if pressure is inadequate.
• Power-cycle: After restoring flow, disconnect power for 30 seconds, reconnect, and attempt a manual regeneration from the BWT control panel.

If E1 persists despite good flow and pressure, the internal flow sensor or control valve may be faulty and should be checked by a qualified technician.