Display shows E01 and the Amfa4000 will not start a regeneration cycle

Safety first: Turn off the water supply to the Amfa4000 and disconnect power (unplug or switch off fused spur) before removing any covers.

• 1. Verify household water supply: Ensure the main water supply to the property is on and that other taps have normal pressure. If pressure is very low, resolve with your water supplier or plumber first.
• 2. Check Amfa4000 inlet isolation valve: Locate the small isolation valve or lever on the inlet side of the Amfa4000 bypass/installation manifold. Confirm it is in the fully open position (usually inline with the pipe). If the unit is in bypass, switch it to Service mode.
• 3. Inspect inlet hose and pipework: Follow the flexible hose or copper line from the cold feed to the Amfa4000 inlet. Straighten any kinks and ensure no fittings are crushed or over-tightened.
• 4. Clean inlet screen filter: Many Amfa4000 manifolds include a small mesh screen at the inlet. Shut off water, relieve pressure by opening a nearby tap, then disconnect the inlet union. Carefully remove and rinse the mesh screen under running water. Reinstall and check for leaks.
• 5. Reset the controller: Restore power, then press and hold the controller reset or Cancel/Regenerate button for 5–10 seconds (refer to the Amfa4000 user panel). If E01 clears and a manual regeneration starts, monitor the full cycle.

If E01 persists after confirming water supply and cleaning the inlet screen, the internal flow sensor or inlet manifold may be faulty and should be inspected or replaced by a qualified technician.