E06 error and unit regenerates at incorrect times or too frequently

Safety first: Unplug the unit before opening the control panel.

• Verify settings: Enter the programming mode on the Waterguy controller. Confirm the hardness, capacity, reserve, and regeneration time match your installation requirements.
• Factory reset: Perform a full factory reset according to the Waterguy manual. Re-enter all parameters carefully.
• Check keypad: Press each button individually and ensure none are sticking or registering multiple presses. Clean the keypad surface with a slightly damp cloth (no solvents).
• Firmware update (if supported): Some Waterguy models allow firmware updates via a service port. This should be done only by a qualified technician.

If E06 reappears after a reset and correct programming, the control board may have a non-volatile memory fault and should be replaced.