Aquabion
Aquabion Water Softeners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Controller display shows E01 and the Aquabion softener does not start a regeneration cycle.
Inlet Flow Sensor Failure
E02
Display shows E02 and the Aquabion softener remains in service mode without regenerating based on time.
Real-Time Clock or Timer Failure
E03
Aquabion water softener shows E03 and will not draw brine during regeneration.
Brine Draw Failure / Brine Line Blockage
E04
Display shows E04 and the Aquabion softener is stuck in regeneration or cannot complete a cycle.
Motorized Valve Position Error
E05
Aquabion softener shows E05 and no water flows through the unit, or flow is severely restricted.
Inlet/Outlet Solenoid or Bypass Valve Fault
E06
Display shows E06 and the Aquabion softener reports abnormal water temperature or shuts down.
Temperature Sensor Error
E07
Aquabion softener shows E07 and the display backlight flickers or resets intermittently.
Low Voltage / Power Supply Error
E08
Display shows E08 and the Aquabion softener reports a salt level sensor fault.
Salt Level Sensor Error
E09
Aquabion softener shows E09 and water remains hard even after regeneration.
Hardness Sensor / Conductivity Probe Error
E10
Display shows E10 and the Aquabion softener aborts regeneration shortly after starting.
Regeneration Sequence Timeout
E11
Aquabion softener shows E11 and the display indicates an internal memory or configuration error.
EEPROM / Configuration Data Corruption
E12
Display shows E12 and the Aquabion softener reports an internal leak or unexpected water movement.
Internal Leak Detection / Flow When Idle
E13
Aquabion softener shows E13 and regeneration is inhibited due to low inlet pressure.
Low Inlet Water Pressure Detection
E14
Display shows E14 and the Aquabion softener indicates an overfill or high water level in the brine tank.
Brine Tank Overfill / Float Failure
E15
Aquabion softener shows E15 and regeneration is locked out due to excessive recent regenerations.
Excessive Regeneration Lockout
E16
Display shows E16 and the Aquabion softener reports a communication error between display and main board (on modular models).
Display-to-Main Board Communication Failure
E17
Aquabion softener shows E17 and indicates a sensor calibration error after setup.
Calibration Failure (Flow/Hardness/Level)
E18
Display shows E18 and the Aquabion softener indicates a drain valve or drain flow error.
Drain Valve / Drain Flow Fault
E19
Aquabion softener shows E19 and the controller reports an internal temperature over-limit.
Controller Overtemperature
E20
Display shows E20 and the Aquabion softener indicates a resin bed or capacity calculation error.
Resin Capacity / Bed Monitoring Fault
Symptom
Aquabion softener brine tank emits a foul or rotten odor.
Bacterial Growth in Brine Tank
Symptom
Aquabion softener bypass valve is difficult to turn or stuck.
Bypass Valve Seizure
Symptom
Aquabion softener causes water hammer or banging noises in pipes during regeneration.
Hydraulic Shock Due to Rapid Valve Operation
Symptom
Aquabion softener control head is warm or hot to the touch.
Controller Overheating or Transformer Overload
Symptom
Aquabion softener display is blank or very dim, but power outlet is live.
Display Power or Backlight Failure
Symptom
Aquabion softener does not draw brine during regeneration, but no error code is displayed.
Silent Brine Draw Failure
Symptom
Aquabion softener does not refill the brine tank with water after regeneration.
Brine Refill Failure
Symptom
Aquabion softener is making loud clicking or grinding noises during regeneration.
Gear Train Wear or Valve Obstruction
Symptom
Aquabion softener is stuck in regeneration and does not return to service mode.
Regeneration Stuck / Valve Indexing Failure
Symptom
Aquabion softener leaks water from around the control head or tank connections.
External Leak at Valve or Tank Neck
Symptom
Aquabion softener occasionally allows hard water through before the next scheduled regeneration.
Insufficient Reserve Capacity or Premature Breakthrough
Symptom
Aquabion softener occasionally drips water from the drain line even when not regenerating.
Internal Valve Seepage to Drain
Symptom
Aquabion softener uses salt very quickly; salt level drops much faster than expected.
Excessive Salt Consumption
Symptom
Aquabion softener will not start a regeneration cycle automatically, but manual regeneration works.
Automatic Regeneration Scheduling Failure
Symptom
Salt level in the Aquabion brine tank does not seem to drop over time; salt appears to form a solid bridge.
Salt Bridging in Brine Tank
Symptom
Water from the Aquabion softener has a salty taste after regeneration.
Residual Brine in Service Water
Symptom
Water pressure in the house drops significantly when water passes through the Aquabion softener.
Flow Restriction Through Valve or Resin Bed
Symptom
Water remains hard even though the Aquabion softener appears to regenerate normally (no error codes).
Resin Exhaustion or Fouling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Controller display shows E01 and the Aquabion softener does not start a regeneration cycle.
|
Inlet Flow Sensor Failure | View Details |
| E02 |
Display shows E02 and the Aquabion softener remains in service mode without regenerating based on time.
|
Real-Time Clock or Timer Failure | View Details |
| E03 |
Aquabion water softener shows E03 and will not draw brine during regeneration.
|
Brine Draw Failure / Brine Line Blockage | View Details |
| E04 |
Display shows E04 and the Aquabion softener is stuck in regeneration or cannot complete a cycle.
|
Motorized Valve Position Error | View Details |
| E05 |
Aquabion softener shows E05 and no water flows through the unit, or flow is severely restricted.
|
Inlet/Outlet Solenoid or Bypass Valve Fault | View Details |
| E06 |
Display shows E06 and the Aquabion softener reports abnormal water temperature or shuts down.
|
Temperature Sensor Error | View Details |
| E07 |
Aquabion softener shows E07 and the display backlight flickers or resets intermittently.
|
Low Voltage / Power Supply Error | View Details |
| E08 |
Display shows E08 and the Aquabion softener reports a salt level sensor fault.
|
Salt Level Sensor Error | View Details |
| E09 |
Aquabion softener shows E09 and water remains hard even after regeneration.
|
Hardness Sensor / Conductivity Probe Error | View Details |
| E10 |
Display shows E10 and the Aquabion softener aborts regeneration shortly after starting.
|
Regeneration Sequence Timeout | View Details |
| E11 |
Aquabion softener shows E11 and the display indicates an internal memory or configuration error.
|
EEPROM / Configuration Data Corruption | View Details |
| E12 |
Display shows E12 and the Aquabion softener reports an internal leak or unexpected water movement.
|
Internal Leak Detection / Flow When Idle | View Details |
| E13 |
Aquabion softener shows E13 and regeneration is inhibited due to low inlet pressure.
|
Low Inlet Water Pressure Detection | View Details |
| E14 |
Display shows E14 and the Aquabion softener indicates an overfill or high water level in the brine tank.
|
Brine Tank Overfill / Float Failure | View Details |
| E15 |
Aquabion softener shows E15 and regeneration is locked out due to excessive recent regenerations.
|
Excessive Regeneration Lockout | View Details |
| E16 |
Display shows E16 and the Aquabion softener reports a communication error between display and main board (on modular models).
|
Display-to-Main Board Communication Failure | View Details |
| E17 |
Aquabion softener shows E17 and indicates a sensor calibration error after setup.
|
Calibration Failure (Flow/Hardness/Level) | View Details |
| E18 |
Display shows E18 and the Aquabion softener indicates a drain valve or drain flow error.
|
Drain Valve / Drain Flow Fault | View Details |
| E19 |
Aquabion softener shows E19 and the controller reports an internal temperature over-limit.
|
Controller Overtemperature | View Details |
| E20 |
Display shows E20 and the Aquabion softener indicates a resin bed or capacity calculation error.
|
Resin Capacity / Bed Monitoring Fault | View Details |
| – |
Aquabion softener brine tank emits a foul or rotten odor.
|
Bacterial Growth in Brine Tank | View Details |
| – |
Aquabion softener bypass valve is difficult to turn or stuck.
|
Bypass Valve Seizure | View Details |
| – |
Aquabion softener causes water hammer or banging noises in pipes during regeneration.
|
Hydraulic Shock Due to Rapid Valve Operation | View Details |
| – |
Aquabion softener control head is warm or hot to the touch.
|
Controller Overheating or Transformer Overload | View Details |
| – |
Aquabion softener display is blank or very dim, but power outlet is live.
|
Display Power or Backlight Failure | View Details |
| – |
Aquabion softener does not draw brine during regeneration, but no error code is displayed.
|
Silent Brine Draw Failure | View Details |
| – |
Aquabion softener does not refill the brine tank with water after regeneration.
|
Brine Refill Failure | View Details |
| – |
Aquabion softener is making loud clicking or grinding noises during regeneration.
|
Gear Train Wear or Valve Obstruction | View Details |
| – |
Aquabion softener is stuck in regeneration and does not return to service mode.
|
Regeneration Stuck / Valve Indexing Failure | View Details |
| – |
Aquabion softener leaks water from around the control head or tank connections.
|
External Leak at Valve or Tank Neck | View Details |
| – |
Aquabion softener occasionally allows hard water through before the next scheduled regeneration.
|
Insufficient Reserve Capacity or Premature Breakthrough | View Details |
| – |
Aquabion softener occasionally drips water from the drain line even when not regenerating.
|
Internal Valve Seepage to Drain | View Details |
| – |
Aquabion softener uses salt very quickly; salt level drops much faster than expected.
|
Excessive Salt Consumption | View Details |
| – |
Aquabion softener will not start a regeneration cycle automatically, but manual regeneration works.
|
Automatic Regeneration Scheduling Failure | View Details |
| – |
Salt level in the Aquabion brine tank does not seem to drop over time; salt appears to form a solid bridge.
|
Salt Bridging in Brine Tank | View Details |
| – |
Water from the Aquabion softener has a salty taste after regeneration.
|
Residual Brine in Service Water | View Details |
| – |
Water pressure in the house drops significantly when water passes through the Aquabion softener.
|
Flow Restriction Through Valve or Resin Bed | View Details |
| – |
Water remains hard even though the Aquabion softener appears to regenerate normally (no error codes).
|
Resin Exhaustion or Fouling | View Details |
No matching codes found
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