Error Code	Symptom	Fault Type	Guide
E1	Control panel displays E1 and the softener does not start a regeneration cycle	Inlet Water Supply Fault	View Details
E10	E10 error and the unit cannot detect the resin tank position	Piston / Position Sensor Fault	View Details
E11	E11 error and the brine draw stage does not start or stops prematurely	Brine Draw Vacuum Fault	View Details
E12	E12 error and the unit overfills the brine tank with water	Brine Refill Control Fault	View Details
E13	E13 error and the unit reports excessive water usage or regenerates too frequently	Flow Meter Over‑Range / Leak Detection Fault	View Details
E14	E14 error and the unit cannot detect salt level (on models with electronic salt sensor)	Salt Level Sensor Fault	View Details
E15	E15 error and the unit reports low salt even when the tank is full (on models with salt sensor)	Salt Level Calibration / Reading Error	View Details
E16	E16 error and the unit indicates drain flow problems during regeneration	Drain Line Flow Fault	View Details
E17	E17 error and the unit cannot detect the home position after power‑up	Home Position / Reference Switch Fault	View Details
E18	E18 error and the unit reports abnormal conductivity or hardness after regeneration (on models with sensor)	Water Quality Sensor Fault	View Details
E19	E19 error and the unit indicates simultaneous conflicting valve positions	Valve Position Logic / Sensor Conflict	View Details
E2	Display shows E2 and the unit stops mid‑regeneration	Brine Tank Low Water / Brine Fill Fault	View Details
E20	E20 error and the unit reports internal memory checksum failure	Firmware / Memory Integrity Fault	View Details
E3	E3 error and the softener remains in service mode without regenerating on schedule	Flow Meter / Turbine Sensor Failure	View Details
E4	E4 displayed and the control valve is stuck in one position during regeneration	Motor / Cam Position Fault	View Details
E5	E5 error and the display is frozen or unresponsive	Control Board Communication / EEPROM Fault	View Details
E6	E6 displayed and the time or usage data resets randomly	Real‑Time Clock / Backup Power Fault	View Details
E7	E7 error and the display shows abnormal temperature or shuts down in hot environments	Control Head Over‑Temperature / Temperature Sensor Fault	View Details
E8	E8 error and the unit skips or aborts regeneration cycles	Regeneration Program / Parameter Error	View Details
E9	E9 error and the display shows no flow even when taps are open	Usage Meter Calibration / Signal Error	View Details
–	Brine tank fills with water and overflows periodically	Brine Tank Overfill	View Details
–	Brine tank has water but salt level does not drop over time	Salt Bridge / Salt Mushing	View Details
–	Nobel softener will not start at all, display is blank and unit is unresponsive	No Power / Dead Control	View Details
–	Softener causes noticeable drop in water pressure throughout the house	Flow Restriction Through Softener	View Details
–	Softener causes salty taste in household water after regeneration	Excessive Brine Carryover	View Details
–	Softener continuously drains water even when not in regeneration (slow trickle to drain)	Internal Valve Leak to Drain	View Details
–	Softener display works but buttons do not respond or respond intermittently	Keypad / User Interface Fault	View Details
–	Softener does not regenerate at night as scheduled (no error code, clock appears correct)	Regeneration Scheduling / Trigger Fault	View Details
–	Softener draws no brine during regeneration; brine level in tank does not drop	No Brine Draw	View Details
–	Softener emits a strong rotten‑egg or musty odor from the brine tank	Bacterial Growth in Brine Tank	View Details
–	Softener installed but water remains hard because unit is plumbed incorrectly	Incorrect Plumbing / Bypass Piping	View Details
–	Softener installed in cold area experiences intermittent operation or leaks during freezing weather	Freeze Damage / Seasonal Fault	View Details
–	Softener is leaking water from around the control head	Control Valve External Leak	View Details
–	Softener makes loud clicking, grinding, or knocking noises during regeneration	Mechanical Noise from Control Valve	View Details
–	Softener never regenerates, even after long periods of water use	Under‑Regeneration / No Trigger	View Details
–	Softener regenerates too frequently, wasting salt and water	Over‑Regeneration	View Details
–	Softener stuck in regeneration and continuously running water to drain	Control Valve Stuck in Backwash/Rinse	View Details
–	Visible resin beads appear in household faucets and aerators	Resin Loss into Plumbing	View Details
–	Water leaking from the base of the resin tank	Resin Tank Structural Leak	View Details
–	Water remains hard at taps even though the Nobel softener appears to run normally (no error code)	Loss of Softening Capacity	View Details

Nobel Water Softeners Error Codes

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