Aqmos
Aqmos 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
Display shows E01, and the softener does not start regeneration.
Inlet Valve / Water Supply Fault
E02
E02 displayed, and the unit does not draw brine during regeneration.
Brine Suction / Injector Blockage
E03
E03 error, and the softener is stuck in the regeneration cycle.
Motor / Cam Position Fault
E04
E04 displayed, and no water flows through the softener during service.
Flow Sensor / Turbine Fault
E05
E05 error, and the display shows an abnormal or no salt level reading (if equipped with a salt sensor).
Salt Level Sensor Fault
E06
E06 displayed, and regeneration stops prematurely.
Regeneration Program / Control Board Fault
E07
E07 error, and water continuously drains to the waste line.
Drain Valve / Piston Stuck Open
E08
E08 displayed, and no water is available at taps (system appears blocked).
Outlet Blockage / Resin Bed Compaction
E09
E09 error, and the unit does not refill the brine tank after regeneration.
Brine Refill Valve Fault
E10
E10 displayed, and hardness remains high after regeneration.
Insufficient Regeneration / Capacity Programming Error
E11
E11 error, and display shows abnormal temperature or shuts down in hot environments.
Temperature Sensor / Overheat Protection Fault
E12
E12 displayed, and the time-of-day clock resets or loses settings frequently.
Backup Power / Memory Fault
E13
E13 error, and the display is blank or flickers intermittently.
Display / Power Regulation Fault
E14
E14 displayed, and the unit reports excessive water usage or frequent regenerations.
Flow Meter Over-Registration / Leak Detection
E15
E15 error, and the unit indicates low inlet pressure or fails to start regeneration.
Low Inlet Water Pressure Detection
E16
E16 displayed, and the unit reports a valve position error after power loss.
Valve Position Memory / Homing Fault
E17
E17 error, and the unit indicates a brine overflow risk.
Brine Tank Overfill / Safety Float Activation
E18
E18 displayed, and the unit reports a communication error between the display and main board.
Internal Communication / Interface Fault
E19
E19 error, and the unit indicates a sensor calibration failure.
General Sensor Calibration Fault
E20
E20 displayed, and the unit locks out regeneration until service is performed.
Service Interval / Maintenance Lockout
Symptom
Brine tank emits a strong rotten egg or musty odor.
Bacterial Growth in Brine Tank
Symptom
Control panel buttons are unresponsive or require very hard pressing.
Keypad / Button Failure
Symptom
Display shows random characters or resets when the drive motor starts.
Electrical Noise / Voltage Drop
Symptom
Softener causes low water pressure in the house during normal service.
Flow Restriction Through Softener
Symptom
Softener discharges resin beads into household plumbing (beads found in aerators).
Broken Distributor / Screen Failure
Symptom
Softener installed, but water remains hard because the unit is in bypass.
Bypass Misconfiguration
Symptom
Softener produces water with a salty taste immediately after regeneration.
Insufficient Rinse / Excess Brine Carryover
Symptom
Softener will not power on; display is completely dead.
No Power / Dead Control
Symptom
The drain line continuously drips or runs to waste even when not regenerating.
Drain Valve Not Sealing
Symptom
The softener causes banging or water hammer noises in pipes during regeneration.
Water Hammer / Rapid Valve Operation
Symptom
The softener does not use any salt; the salt level never drops.
No Brine Draw / No Regeneration Effect
Symptom
The softener is stuck in regeneration and does not return to service mode.
Regeneration Cycle Stalled
Symptom
The softener uses salt very quickly and regenerates more often than expected.
Excessive Salt Consumption / Over-Regeneration
Symptom
The softener will not start regeneration automatically at the programmed time.
Timer / Programming Fault
Symptom
The water softener is noisy during regeneration (loud clicking, grinding, or humming).
Mechanical Drive Noise / Valve Wear
Symptom
Water leaks from around the control head on top of the resin tank.
Control Valve Head Leak
Symptom
Water leaks from the brine tank or around its base.
Brine Tank Leak
Symptom
Water remains hard at taps even though the softener appears to run normally (no error code).
Resin Exhaustion / Fouling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Display shows E01, and the softener does not start regeneration.
|
Inlet Valve / Water Supply Fault | View Details |
| E02 |
E02 displayed, and the unit does not draw brine during regeneration.
|
Brine Suction / Injector Blockage | View Details |
| E03 |
E03 error, and the softener is stuck in the regeneration cycle.
|
Motor / Cam Position Fault | View Details |
| E04 |
E04 displayed, and no water flows through the softener during service.
|
Flow Sensor / Turbine Fault | View Details |
| E05 |
E05 error, and the display shows an abnormal or no salt level reading (if equipped with a salt sensor).
|
Salt Level Sensor Fault | View Details |
| E06 |
E06 displayed, and regeneration stops prematurely.
|
Regeneration Program / Control Board Fault | View Details |
| E07 |
E07 error, and water continuously drains to the waste line.
|
Drain Valve / Piston Stuck Open | View Details |
| E08 |
E08 displayed, and no water is available at taps (system appears blocked).
|
Outlet Blockage / Resin Bed Compaction | View Details |
| E09 |
E09 error, and the unit does not refill the brine tank after regeneration.
|
Brine Refill Valve Fault | View Details |
| E10 |
E10 displayed, and hardness remains high after regeneration.
|
Insufficient Regeneration / Capacity Programming Error | View Details |
| E11 |
E11 error, and display shows abnormal temperature or shuts down in hot environments.
|
Temperature Sensor / Overheat Protection Fault | View Details |
| E12 |
E12 displayed, and the time-of-day clock resets or loses settings frequently.
|
Backup Power / Memory Fault | View Details |
| E13 |
E13 error, and the display is blank or flickers intermittently.
|
Display / Power Regulation Fault | View Details |
| E14 |
E14 displayed, and the unit reports excessive water usage or frequent regenerations.
|
Flow Meter Over-Registration / Leak Detection | View Details |
| E15 |
E15 error, and the unit indicates low inlet pressure or fails to start regeneration.
|
Low Inlet Water Pressure Detection | View Details |
| E16 |
E16 displayed, and the unit reports a valve position error after power loss.
|
Valve Position Memory / Homing Fault | View Details |
| E17 |
E17 error, and the unit indicates a brine overflow risk.
|
Brine Tank Overfill / Safety Float Activation | View Details |
| E18 |
E18 displayed, and the unit reports a communication error between the display and main board.
|
Internal Communication / Interface Fault | View Details |
| E19 |
E19 error, and the unit indicates a sensor calibration failure.
|
General Sensor Calibration Fault | View Details |
| E20 |
E20 displayed, and the unit locks out regeneration until service is performed.
|
Service Interval / Maintenance Lockout | View Details |
| – |
Brine tank emits a strong rotten egg or musty odor.
|
Bacterial Growth in Brine Tank | View Details |
| – |
Control panel buttons are unresponsive or require very hard pressing.
|
Keypad / Button Failure | View Details |
| – |
Display shows random characters or resets when the drive motor starts.
|
Electrical Noise / Voltage Drop | View Details |
| – |
Softener causes low water pressure in the house during normal service.
|
Flow Restriction Through Softener | View Details |
| – |
Softener discharges resin beads into household plumbing (beads found in aerators).
|
Broken Distributor / Screen Failure | View Details |
| – |
Softener installed, but water remains hard because the unit is in bypass.
|
Bypass Misconfiguration | View Details |
| – |
Softener produces water with a salty taste immediately after regeneration.
|
Insufficient Rinse / Excess Brine Carryover | View Details |
| – |
Softener will not power on; display is completely dead.
|
No Power / Dead Control | View Details |
| – |
The drain line continuously drips or runs to waste even when not regenerating.
|
Drain Valve Not Sealing | View Details |
| – |
The softener causes banging or water hammer noises in pipes during regeneration.
|
Water Hammer / Rapid Valve Operation | View Details |
| – |
The softener does not use any salt; the salt level never drops.
|
No Brine Draw / No Regeneration Effect | View Details |
| – |
The softener is stuck in regeneration and does not return to service mode.
|
Regeneration Cycle Stalled | View Details |
| – |
The softener uses salt very quickly and regenerates more often than expected.
|
Excessive Salt Consumption / Over-Regeneration | View Details |
| – |
The softener will not start regeneration automatically at the programmed time.
|
Timer / Programming Fault | View Details |
| – |
The water softener is noisy during regeneration (loud clicking, grinding, or humming).
|
Mechanical Drive Noise / Valve Wear | View Details |
| – |
Water leaks from around the control head on top of the resin tank.
|
Control Valve Head Leak | View Details |
| – |
Water leaks from the brine tank or around its base.
|
Brine Tank Leak | View Details |
| – |
Water remains hard at taps even though the softener appears to run normally (no error code).
|
Resin Exhaustion / Fouling | View Details |
No matching codes found
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