E10 displayed and unit skips regeneration cycles entirely

Safety first: No plumbing work is required for basic checks. Unplug the unit if you remove the control cover.

Step-by-step:

• Check regeneration mode: Enter the programming menu and verify that automatic regeneration is enabled (time clock or metered mode) and that vacation/lockout mode is off.
• Verify time settings: Ensure the current time and regeneration start time are correct (usually set for 2:00 AM or similar).
• Manual regeneration test: Attempt to start a manual regeneration from the panel. If the unit will not start and E10 appears, the control may be inhibiting the cycle.
• Inspect motor connection: With power off, remove the cover and check that the drive motor is plugged into the control board and that wires are intact.

When to call a technician: If programming is correct and the motor and board connections are intact but E10 persists, the control board or motor drive circuit likely needs replacement.