Control panel displays E01 and the softener will not start a regeneration cycle.

Safety first: Turn off electrical power to the softener and close the main water supply if you will be opening any plumbing. Depressurize the system by opening a nearby faucet.

• 1. Verify bypass position: Locate the SoftPro bypass valve assembly behind the control head. Ensure the inlet and outlet valves are in the Service position (not in Bypass). Many SoftPro units use a three-valve or single-lever bypass; confirm the handle orientation per the label on the valve.
• 2. Check household water pressure: Open a cold-water faucet upstream of the softener. If there is little or no flow, the issue is with the house supply, not the softener. Restore water pressure before retesting.
• 3. Inspect inlet screen: Remove power, close inlet and outlet valves, and relieve pressure. On the SoftPro control valve head, remove the inlet fitting and check for a small mesh screen or flow restrictor. Rinse debris under running water. Do not damage the screen.
• 4. Check for kinks or obstructions: Inspect copper, PEX, or flex connectors leading into the SoftPro valve. Straighten any kinks and ensure no shutoff valves are partially closed.
• 5. Restore and test: Reassemble fittings, slowly open inlet and outlet valves to avoid water hammer, restore power, and attempt a manual regeneration from the control panel. If E01 persists, the internal flow sensor or valve body may be restricted and should be inspected by a technician.