Display shows “Err 04” and regeneration stops in brine draw or slow rinse position.

Safety first: Bypass the softener and depressurize by opening a nearby faucet. Disconnect power to the controller.

Check brine draw:

• Ensure the brine tank has adequate water and salt. If the tank is dry or overfilled, correct this first.
• Inspect the brine line from the control valve to the brine tank for kinks, pinches, or leaks.
• Remove the brine line at the valve and check the fitting and O-ring for damage or salt buildup.

Clean the injector/venturi:

• Locate the injector/venturi assembly on the Kinetico control valve (often under a cap labeled INJECTOR or BRINE).
• Carefully remove the cap and pull out the injector nozzle and throat pieces.
• Soak the parts in warm water with a small amount of vinegar to dissolve iron or scale. Use a soft brush or toothpick to clear small orifices—do not enlarge them.
• Inspect and clean the injector screen and any check balls or seats.
• Reassemble with clean O-rings lubricated with silicone grease.

Test:

• Return the bypass to SERVICE and restore power.
• Initiate a manual regeneration and observe the brine line in brine draw stage. You should see or feel suction at the brine line.
• If there is still no draw, the brine valve or internal valve seals may be faulty and require professional service.