Error Code	Symptom	Fault Type	Guide
E01	Display shows E01 and the Judo water softener does not start regeneration	Inlet Water Supply Fault	View Details
E02	E02 displayed and the Judo softener is stuck in regeneration or will not advance through cycles	Motor / Valve Drive Fault	View Details
E03	E03 error and the display indicates a flow sensor or water meter problem; softener does not count water usage	Flow Meter / Turbine Sensor Failure	View Details
E04	E04 displayed and the brine draw phase does not start or stops prematurely during regeneration	Brine Suction / Injector Fault	View Details
E05	E05 error and the brine tank overfills with water after regeneration	Brine Refill / Float Valve Fault	View Details
E06	E06 displayed and the Judo softener reports a salt level or brine sensor error	Salt Level / Brine Sensor Fault	View Details
E07	E07 error and the Judo softener display shows a drain or waste line fault during regeneration	Drain Line / Backwash Discharge Fault	View Details
E08	E08 displayed and the unit reports a hardness sensor or quality sensor error (on models with integrated water quality monitoring)	Hardness / Conductivity Sensor Fault	View Details
E09	E09 error and the display indicates a memory or configuration fault	Control Board EEPROM / Configuration Error	View Details
E10	E10 displayed and the Judo softener shows an internal temperature or overheat error	Control Head Overtemperature Fault	View Details
E11	E11 error and the display indicates a power supply or low voltage fault	Low Voltage / Power Supply Fault	View Details
E12	E12 displayed and the Judo softener reports a timekeeping or clock error	Real-Time Clock / Backup Power Fault	View Details
E13	E13 error and the display indicates a valve position or encoder fault	Valve Position Sensor / Encoder Error	View Details
E14	E14 displayed and the Judo softener indicates an internal leak or safety sensor alarm (on models with leak detection)	Internal Leak Detection Alarm	View Details
E15	E15 error and the Judo softener shows a communication fault between display and main board (on split-display models)	Display–Main Board Communication Error	View Details
E16	E16 displayed and the Judo softener indicates an abnormal regeneration duration or timeout	Regeneration Cycle Timeout	View Details
E17	E17 error and the Judo softener reports an abnormal flow during regeneration (too high or too low)	Regeneration Flow Rate Fault	View Details
E18	E18 displayed and the Judo softener indicates a bypass valve or safety shutoff fault (on models with motorized bypass)	Motorized Bypass / Safety Shutoff Fault	View Details
E19	E19 error and the Judo softener indicates a resin capacity or exhaustion fault before scheduled regeneration	Premature Capacity Exhaustion / Sizing Fault	View Details
E20	E20 displayed and the Judo softener indicates a sensor bus or multiple sensor failure	Sensor Bus Communication Fault	View Details
–	Brine tank overflows or is excessively full of water	Brine Tank Overfill	View Details
–	Buttons on the Judo softener control panel do not respond or respond erratically	Keypad / User Interface Failure	View Details
–	Judo softener causes intermittent leaks only during regeneration cycles	Cycle-Dependent Internal Leak	View Details
–	Judo softener causes very low water pressure or flow in the house during normal service	Flow Restriction in Valve or Resin Bed	View Details
–	Judo softener display is blank or intermittently turns off, but power outlet is live	Display Power / Connection Issue	View Details
–	Judo softener does not regenerate at all and manual regeneration cannot be started	Complete Regeneration Inhibition	View Details
–	Judo softener emits a foul or musty odor from the brine tank or softened water	Bacterial Growth / Organic Contamination	View Details
–	Judo softener frequently runs out of salt or shows low salt even though tank appears full	Salt Bridging / False Salt Level	View Details
–	Judo softener installed but no water flows through it at all in service mode	Installation / Plumbing Misconfiguration	View Details
–	Judo softener leaks water from around the valve head or top of the resin tank	Valve Head / Tank O-Ring Leak	View Details
–	Judo softener makes loud banging or water hammer noises during regeneration	Water Hammer / Rapid Valve Switching	View Details
–	Judo softener regenerates too often, wasting salt and water	Over-Frequent Regeneration	View Details
–	Judo softener stuck in regeneration and does not return to service position	Regeneration Stuck / Valve Indexing Failure	View Details
–	Judo softener uses no salt over several weeks and salt level does not drop	No Brine Draw / Regeneration Not Consuming Salt	View Details
–	Judo water softener does not start regeneration at the programmed time	Regeneration Scheduling / Timer Fault	View Details
–	Softened water tastes salty after regeneration	Residual Brine Carryover	View Details
–	Water leaking from around the Judo brine line connections or inside the brine tank	Brine Line / Brine Well Leak	View Details
–	Water remains hard at taps even though the Judo softener appears to run regenerations normally	Loss of Softening Capacity	View Details

Judo Water Softeners Error Codes

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