Display shows ERR4 and softener does not meter water usage correctly

Safety first: Disconnect power before accessing the control panel or wiring.

Steps to check:

• 1. Inspect connectors: Remove the control cover and locate the turbine/flow sensor connector on the main board. Unplug and inspect for corrosion, bent pins, or moisture. Clean with electronic contact cleaner and reconnect firmly.
• 2. Check wiring continuity: With a multimeter, verify continuity from the turbine sensor plug at the valve to the connector at the control board. Repair or replace the harness if open.
• 3. Reset the control: Unplug the softener for 5 minutes, then plug back in. Reprogram time and hardness if needed. Run water and observe if ERR4 reappears.
• 4. Replace control board if needed: If the sensor and wiring are confirmed good and ERR4 persists, replace the Whirlpool electronic control board with the correct model-specific part.

When to call a technician: Board replacement involves handling static-sensitive electronics and reprogramming; if you are not comfortable, contact a qualified technician.