Control panel shows 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 disconnecting any plumbing. Depressurize the system by opening a nearby cold-water faucet.

Step-by-step:

• Check bypass position: Verify the AquaUnique bypass valve is in the SERVICE position (both inlet and outlet valves open, bypass closed). If in BYPASS, slowly return it to SERVICE.
• Inspect inlet shutoff: Confirm the dedicated inlet shutoff valve to the softener is fully open.
• Clean inlet screen: Remove power, close inlet/outlet valves, relieve pressure, then remove the inlet union at the control valve. Pull out and rinse the inlet screen/filter under running water. Reinstall and tighten carefully.
• Check household pressure: Ensure you have at least 20–25 psi at the softener. If pressure is low, correct well pump/pressure tank issues first.
• Run a manual regeneration: Restore power and water, then initiate a manual regeneration from the control panel. If E01 clears and cycle runs, monitor for recurrence.

When to call a technician: If E01 returns immediately after confirming flow and cleaning the inlet screen, the internal flow sensor or control valve body may be faulty and should be tested or replaced by a professional.