E15 error and unit continuously uses water to drain even when not regenerating

Safety first: Immediately place the softener in bypass to stop water waste, then disconnect power.

• Inspect drain flow: Confirm that water is flowing from the drain hose even when the display shows service mode.
• Remove valve head cover: With water off and pressure relieved, remove the control cover and inspect the rotor and seal pack for visible damage or debris.
• Clean rotor area: Carefully remove any foreign material. Do not scratch sealing surfaces.
• Check seal pack: If the rotor seal pack is torn or deformed, replace it with the correct Water2Buy seal kit.
• Controller reset: After mechanical checks, reset the controller and ensure it is in service mode. Restore water and check that drain flow has stopped.
• If leak persists: Replace the entire valve head, as a cracked body or internal damage may be present.