E6 displayed, unit regenerates at incorrect intervals or not at all based on usage

Safety: No internal high-voltage work is required for basic checks, but unplug the unit before removing the cover.

• 1. Verify programming: Enter the programming mode and confirm the hardness, capacity, and reserve settings match your RainSoft model and local water hardness. Correct any obvious errors.
• 2. Check flow meter operation: With the cover on, run water and verify that the display shows flow and that the remaining capacity decreases. If not, troubleshoot the flow meter (see E5).
• 3. Reset controller: Perform a factory reset if available in the installer menu, then re-enter all parameters.
• 4. Observe regeneration trigger: Over a day or two, monitor whether the unit regenerates when capacity reaches zero. If E6 recurs and metering appears correct, the control board's metering logic may be faulty.

Resolution: If reprogramming and meter repair do not resolve E6, replace the RainSoft control board with the correct part number.