Error Code	Symptom	Fault Type	Guide
E01	Control panel shows E01 and softener will not start a regeneration cycle	Inlet Water Supply Fault	View Details
E02	Display shows E02 and the unit does not draw brine during regeneration	Brine Suction / Injector Blockage	View Details
E03	E03 displayed and the softener is stuck in regeneration or will not advance through cycles	Motor / Cam Drive Fault	View Details
E04	E04 error and the display shows incorrect time or loses settings frequently	Control Board / Memory Fault	View Details
E05	E05 displayed and the unit does not detect water flow or does not meter usage	Flow Meter / Turbine Sensor Fault	View Details
E06	E06 error and the softener regenerates at incorrect times or too frequently	Programming / Parameter Error	View Details
E07	E07 displayed and the unit will not initiate regeneration when expected	Regeneration Start Failure	View Details
E08	E08 error and the display is blank or very dim, unit appears dead	Low Voltage / Power Supply Fault	View Details
E09	E09 displayed and the unit overfills the brine tank or floods during refill	Brine Refill Control Fault	View Details
E10	E10 error and the unit drains continuously or for excessively long periods	Drain Valve / Piston Seal Fault	View Details
E11	E11 displayed and the unit reports a salt level or brine sensor fault (on models with sensor)	Salt Level / Brine Sensor Fault	View Details
E12	E12 error and the unit indicates a drain line or backwash flow problem	Drain Line / Backwash Flow Restriction	View Details
E13	E13 displayed and the unit reports an internal leak or valve position error	Internal Bypass / Cross-Leak Fault	View Details
E14	E14 error and the display indicates high flow or leak alarm (on models with leak detection)	Continuous Flow / Leak Detection Alarm	View Details
E15	E15 displayed and the unit indicates a sensor communication or bus error	Communication Fault Between Control Board and Sensors	View Details
E16	E16 error and the unit reports a temperature or environment fault (on models with temp sensor)	Ambient / Water Temperature Sensor Fault	View Details
E17	E17 displayed and the unit indicates a resin tank pressure or safety fault (on models with pressure switch)	Overpressure / Safety Switch Activation	View Details
E18	E18 error and the unit indicates a bypass valve position fault (on models with electronic bypass feedback)	Bypass Position Detection Fault	View Details
E19	E19 displayed and the unit indicates an internal clock or battery backup fault (on models with backup)	Real-Time Clock / Backup Power Fault	View Details
E20	E20 error and the unit indicates a general system fault requiring service	General System Error / Self-Test Failure	View Details
–	Brine tank full of water or water level unusually high	Brine Tank Overfill	View Details
–	Display is on but buttons do not respond or are intermittent	Keypad / User Interface Fault	View Details
–	No water in brine tank, salt sits dry at the bottom	No Brine Refill	View Details
–	Salt forms a hard crust (bridge) in the brine tank and water level stays low underneath	Salt Bridging	View Details
–	Salt turns to mush or sludge at the bottom of the brine tank	Salt Mushing	View Details
–	Softener appears to regenerate but water remains hard immediately afterwards	Incomplete or Ineffective Regeneration	View Details
–	Softener causes noticeable drop in water pressure throughout the house	Flow Restriction Through Softener	View Details
–	Softener does not start at all after installation or power outage	Initial Start-Up / Power-On Failure	View Details
–	Softener emits a constant humming or buzzing from the control head	Transformer / Motor Hum	View Details
–	Softener installed but water is always hard, as if bypassed	Incorrect Plumbing / Bypass Misconfiguration	View Details
–	Softener leaks water from around the control valve head	Control Valve External Leak	View Details
–	Softener makes loud banging or hammering noises during regeneration	Water Hammer / Rapid Valve Operation Noise	View Details
–	Softener regenerates at the wrong time of day	Clock / Time Setting Issue	View Details
–	Softener stuck in bypass and cannot be returned to service	Bypass Valve Mechanical Failure	View Details
–	Softener uses excessive salt and regenerates more often than expected	Over-Regeneration / High Salt Consumption	View Details
–	Softener uses very little or no salt over several weeks	No Brine Draw / No Regeneration Salt Usage	View Details
–	Water has a salty taste after the softener	Residual Brine Carryover	View Details
–	Water leaking from brine tank or around brine well	Brine Tank Leak	View Details
–	Water remains hard at taps even though the Aqua Dial softener appears to run normally	Resin Exhaustion / Resin Fouling	View Details

Aqua Dial Water Softeners Error Codes

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