AquaSoft
AquaSoft 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
Control panel displays E01 and the softener will not start a regeneration cycle.
Main Control Board Communication Fault
E02
Display shows E02 and the unit does not draw brine during regeneration.
Brine Valve / Injector Blockage
E03
E03 appears and the softener remains in regeneration or cannot advance through cycles.
Motor / Cam Indexing Failure
E04
Display shows E04 and water flow through the softener is severely reduced or stopped.
Inlet/Outlet Flow Sensor Error
E05
E05 error and the unit does not regenerate automatically based on water usage.
Metering / Usage Sensor Failure
E06
E06 displayed and the softener is stuck in backwash or brine rinse position.
Position Switch / Encoder Fault
E07
E07 error and the display is blank or flickering intermittently.
Low Voltage / Power Supply Fault
E08
E08 appears and the brine tank overfills with water after regeneration.
Brine Refill Control Failure
E09
E09 error and the unit fails to draw brine but the brine tank does not overfill.
Brine Line / Air Leak Fault
E10
E10 displayed and the unit regenerates too frequently or not at all based on hardness settings.
Programming / Hardness Sensor Error
E11
E11 error and the display shows an abnormally high or low water temperature reading (on models with temperature monitoring).
Temperature Sensor Fault
E12
E12 appears and the unit reports a salt level error or cannot detect salt level (on models with electronic salt sensor).
Salt Level Sensor Fault
E13
E13 error and the unit fails to enter regeneration at the programmed time.
Real-Time Clock / Timer Fault
E14
E14 displayed and the unit reports excessive regeneration time or fails to complete a cycle within the expected duration.
Regeneration Timeout Fault
E15
E15 error and the unit indicates an internal memory or configuration fault.
EEPROM / Configuration Memory Error
E16
E16 displayed and the unit reports a drain line or drain valve error.
Drain Line / Drain Valve Obstruction
E17
E17 error and the unit indicates an inlet water pressure problem.
Inlet Pressure / Sensor Fault
E18
E18 displayed and the unit reports a resin tank overpressure or safety shutoff condition.
Overpressure / Relief Fault
E19
E19 error and the unit indicates a resin tank sensor or level fault (on models with resin monitoring).
Resin Level / Conductivity Sensor Fault
E20
E20 displayed and the unit reports an internal valve leak or cross-leak condition.
Internal Bypass / Seal Failure
Symptom
Buttons on the AquaSoft control panel do not respond or respond intermittently.
Keypad / User Interface Failure
Symptom
Bypass valve is difficult to turn or leaks when moved between service and bypass.
Bypass Valve Wear / Seizure
Symptom
Softener appears to work but there is a persistent sulfur or rotten egg smell in the water.
Hydrogen Sulfide / Bacterial Contamination
Symptom
Softener causes a salty taste in the softened water after regeneration.
Excessive Salt Carryover
Symptom
Softener causes air spurting from faucets after regeneration.
Air Intrusion into Plumbing
Symptom
Softener causes low water pressure throughout the house, even in service mode.
System Flow Restriction
Symptom
Softener display is blank but outlet has power.
No Display / Dead Control Panel
Symptom
Softener does not regenerate at all; no sounds or movement at the scheduled time.
No Regeneration / Control Inactivity
Symptom
Softener emits a burning smell or visible smoke from the control area.
Electrical Overheating / Short Circuit
Symptom
Softener frequently overflows the drain or backs up at the drain connection.
Drain Capacity / Installation Issue
Symptom
Softener is very noisy during regeneration, with loud banging or knocking sounds in the pipes.
Water Hammer / Valve Impact Noise
Symptom
Softener leaks water from around the control head or valve body.
Control Head External Leak
Symptom
Softener produces discolored (brown/orange) water after regeneration.
Iron Discharge / Resin Fouling
Symptom
Softener regenerates too often, wasting salt and water.
Excessive Regeneration Frequency
Symptom
Softener stuck in regeneration; water may be hard or unavailable during extended cycle.
Regeneration Stuck / Incomplete Cycle
Symptom
Softener uses very little or no salt over several weeks.
No Salt Consumption
Symptom
Softener will not draw brine but does backwash and rinse normally (no code displayed).
Selective Brine Draw Failure
Symptom
Water leaking from the brine tank onto the floor.
Brine Tank Leak
Symptom
Water remains hard even after the AquaSoft softener has recently regenerated.
Loss of Softening Capacity
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Control panel displays E01 and the softener will not start a regeneration cycle.
|
Main Control Board Communication Fault | View Details |
| E02 |
Display shows E02 and the unit does not draw brine during regeneration.
|
Brine Valve / Injector Blockage | View Details |
| E03 |
E03 appears and the softener remains in regeneration or cannot advance through cycles.
|
Motor / Cam Indexing Failure | View Details |
| E04 |
Display shows E04 and water flow through the softener is severely reduced or stopped.
|
Inlet/Outlet Flow Sensor Error | View Details |
| E05 |
E05 error and the unit does not regenerate automatically based on water usage.
|
Metering / Usage Sensor Failure | View Details |
| E06 |
E06 displayed and the softener is stuck in backwash or brine rinse position.
|
Position Switch / Encoder Fault | View Details |
| E07 |
E07 error and the display is blank or flickering intermittently.
|
Low Voltage / Power Supply Fault | View Details |
| E08 |
E08 appears and the brine tank overfills with water after regeneration.
|
Brine Refill Control Failure | View Details |
| E09 |
E09 error and the unit fails to draw brine but the brine tank does not overfill.
|
Brine Line / Air Leak Fault | View Details |
| E10 |
E10 displayed and the unit regenerates too frequently or not at all based on hardness settings.
|
Programming / Hardness Sensor Error | View Details |
| E11 |
E11 error and the display shows an abnormally high or low water temperature reading (on models with temperature monitoring).
|
Temperature Sensor Fault | View Details |
| E12 |
E12 appears and the unit reports a salt level error or cannot detect salt level (on models with electronic salt sensor).
|
Salt Level Sensor Fault | View Details |
| E13 |
E13 error and the unit fails to enter regeneration at the programmed time.
|
Real-Time Clock / Timer Fault | View Details |
| E14 |
E14 displayed and the unit reports excessive regeneration time or fails to complete a cycle within the expected duration.
|
Regeneration Timeout Fault | View Details |
| E15 |
E15 error and the unit indicates an internal memory or configuration fault.
|
EEPROM / Configuration Memory Error | View Details |
| E16 |
E16 displayed and the unit reports a drain line or drain valve error.
|
Drain Line / Drain Valve Obstruction | View Details |
| E17 |
E17 error and the unit indicates an inlet water pressure problem.
|
Inlet Pressure / Sensor Fault | View Details |
| E18 |
E18 displayed and the unit reports a resin tank overpressure or safety shutoff condition.
|
Overpressure / Relief Fault | View Details |
| E19 |
E19 error and the unit indicates a resin tank sensor or level fault (on models with resin monitoring).
|
Resin Level / Conductivity Sensor Fault | View Details |
| E20 |
E20 displayed and the unit reports an internal valve leak or cross-leak condition.
|
Internal Bypass / Seal Failure | View Details |
| – |
Buttons on the AquaSoft control panel do not respond or respond intermittently.
|
Keypad / User Interface Failure | View Details |
| – |
Bypass valve is difficult to turn or leaks when moved between service and bypass.
|
Bypass Valve Wear / Seizure | View Details |
| – |
Softener appears to work but there is a persistent sulfur or rotten egg smell in the water.
|
Hydrogen Sulfide / Bacterial Contamination | View Details |
| – |
Softener causes a salty taste in the softened water after regeneration.
|
Excessive Salt Carryover | View Details |
| – |
Softener causes air spurting from faucets after regeneration.
|
Air Intrusion into Plumbing | View Details |
| – |
Softener causes low water pressure throughout the house, even in service mode.
|
System Flow Restriction | View Details |
| – |
Softener display is blank but outlet has power.
|
No Display / Dead Control Panel | View Details |
| – |
Softener does not regenerate at all; no sounds or movement at the scheduled time.
|
No Regeneration / Control Inactivity | View Details |
| – |
Softener emits a burning smell or visible smoke from the control area.
|
Electrical Overheating / Short Circuit | View Details |
| – |
Softener frequently overflows the drain or backs up at the drain connection.
|
Drain Capacity / Installation Issue | View Details |
| – |
Softener is very noisy during regeneration, with loud banging or knocking sounds in the pipes.
|
Water Hammer / Valve Impact Noise | View Details |
| – |
Softener leaks water from around the control head or valve body.
|
Control Head External Leak | View Details |
| – |
Softener produces discolored (brown/orange) water after regeneration.
|
Iron Discharge / Resin Fouling | View Details |
| – |
Softener regenerates too often, wasting salt and water.
|
Excessive Regeneration Frequency | View Details |
| – |
Softener stuck in regeneration; water may be hard or unavailable during extended cycle.
|
Regeneration Stuck / Incomplete Cycle | View Details |
| – |
Softener uses very little or no salt over several weeks.
|
No Salt Consumption | View Details |
| – |
Softener will not draw brine but does backwash and rinse normally (no code displayed).
|
Selective Brine Draw Failure | View Details |
| – |
Water leaking from the brine tank onto the floor.
|
Brine Tank Leak | View Details |
| – |
Water remains hard even after the AquaSoft softener has recently regenerated.
|
Loss of Softening Capacity | View Details |
No matching codes found
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