Cillit
Cillit 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 softener does not start regeneration
Inlet Water Supply Fault
E02
Display shows E02 and the unit remains in service mode without regenerating
Flow Sensor / Turbine Signal Failure
E03
E03 displayed and regeneration stops shortly after starting
Brine Tank Low Salt / No Brine Draw
E04
E04 error and the valve remains in one position, water hardness increases
Motor / Drive Fault on Control Valve
E05
E05 displayed, unit stuck in regeneration and water supply may be interrupted
Valve Positioning Error
E06
E06 error and display may show abnormal time or program values
Control Board / Memory Fault
E07
E07 displayed, no water flow through softener during service
Outlet / Service Flow Blockage
E08
E08 error and water remains hard even after regeneration
Resin Capacity / Exhaustion Fault
E09
E09 displayed, unit does not keep correct time or loses settings
Backup Power / Battery Fault
E10
E10 error and the unit overflows brine or shows unusually high water level in brine tank
Brine Refill / Overflow Fault
E11
E11 displayed, unit does not start scheduled regeneration cycles
Regeneration Scheduling / Timer Fault
E12
E12 error and the unit reports abnormal temperature or shuts down in cold conditions
Temperature Sensor Fault
E13
E13 displayed, drain water continues to run or unit cannot complete regeneration
Continuous Drain / Drain Valve Fault
E14
E14 error and the unit reports excessive water usage or frequent regenerations
Flow Measurement / Overuse Fault
E15
E15 displayed, unit indicates drain blockage or high backpressure
Drain Line / Backpressure Fault
E16
E16 error and the display shows abnormal inlet pressure or protection shutdown
Overpressure / Pressure Sensor Fault
E17
E17 displayed, unit reports communication error between display and main board
Internal Communication Fault
E18
E18 error and the unit indicates sensor calibration or configuration error
Configuration / Parameter Fault
Symptom
Brine tank is full of water but salt does not dissolve properly
Salt Mushing / Brine Saturation Problem
Symptom
Brine tank overflows or water level is consistently very high
Brine Tank Overflow
Symptom
Cillit softener does not use any salt over weeks of operation
No Brine Draw / Regeneration Not Occurring
Symptom
Display is on but buttons do not respond or respond intermittently
Keypad / User Interface Fault
Symptom
Salt forms a hard crust (salt bridge) in the Cillit brine tank and water level stays low underneath
Salt Bridging in Brine Tank
Symptom
Softener causes a salty taste in the cold water after regeneration
Excessive Brine Carryover
Symptom
Softener causes low water pressure or flow in the house, especially during service mode
Flow Restriction Through Softener
Symptom
Softener does not start at all (no display, no lights)
No Power / Electrical Supply Fault
Symptom
Softener emits a persistent plastic or chemical smell around the unit
Overheating Electronics / New Plastic Odor
Symptom
Softener installed but some outlets remain hard while others are soft
Partial Bypass / Cross‑Connection
Symptom
Softener installed but taps deliver only soft water; no hard water line available where required (e.g., kitchen drinking tap)
Incorrect Plumbing / Bypass Configuration
Symptom
Softener is noisy during regeneration (loud banging, hammering, or whistling)
Hydraulic Shock / Valve Noise
Symptom
Softener makes grinding or clicking noises from the valve head during regeneration
Drive Gear / Motor Wear
Symptom
Softener occasionally delivers bursts of discolored (brown/yellow) water after regeneration
Resin Fouling / Iron Discharge
Symptom
Softener regenerates at the wrong time of day (e.g., midday instead of night)
Clock / Time Setting Issue
Symptom
Softener regenerates too often, causing excessive salt and water consumption
Over‑Regeneration / Incorrect Capacity Setting
Symptom
Water leaks from around the Cillit control valve head or between valve and tank
Valve Head / Tank O‑Ring Leak
Symptom
Water leaks from the brine line connections or brine well
Brine Line / Fitting Leak
Symptom
Water remains hard at taps even though the Cillit softener appears to run normally (no error code)
Bypass or Mixing Valve Misadjustment
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Controller display shows E01 and the softener does not start regeneration
|
Inlet Water Supply Fault | View Details |
| E02 |
Display shows E02 and the unit remains in service mode without regenerating
|
Flow Sensor / Turbine Signal Failure | View Details |
| E03 |
E03 displayed and regeneration stops shortly after starting
|
Brine Tank Low Salt / No Brine Draw | View Details |
| E04 |
E04 error and the valve remains in one position, water hardness increases
|
Motor / Drive Fault on Control Valve | View Details |
| E05 |
E05 displayed, unit stuck in regeneration and water supply may be interrupted
|
Valve Positioning Error | View Details |
| E06 |
E06 error and display may show abnormal time or program values
|
Control Board / Memory Fault | View Details |
| E07 |
E07 displayed, no water flow through softener during service
|
Outlet / Service Flow Blockage | View Details |
| E08 |
E08 error and water remains hard even after regeneration
|
Resin Capacity / Exhaustion Fault | View Details |
| E09 |
E09 displayed, unit does not keep correct time or loses settings
|
Backup Power / Battery Fault | View Details |
| E10 |
E10 error and the unit overflows brine or shows unusually high water level in brine tank
|
Brine Refill / Overflow Fault | View Details |
| E11 |
E11 displayed, unit does not start scheduled regeneration cycles
|
Regeneration Scheduling / Timer Fault | View Details |
| E12 |
E12 error and the unit reports abnormal temperature or shuts down in cold conditions
|
Temperature Sensor Fault | View Details |
| E13 |
E13 displayed, drain water continues to run or unit cannot complete regeneration
|
Continuous Drain / Drain Valve Fault | View Details |
| E14 |
E14 error and the unit reports excessive water usage or frequent regenerations
|
Flow Measurement / Overuse Fault | View Details |
| E15 |
E15 displayed, unit indicates drain blockage or high backpressure
|
Drain Line / Backpressure Fault | View Details |
| E16 |
E16 error and the display shows abnormal inlet pressure or protection shutdown
|
Overpressure / Pressure Sensor Fault | View Details |
| E17 |
E17 displayed, unit reports communication error between display and main board
|
Internal Communication Fault | View Details |
| E18 |
E18 error and the unit indicates sensor calibration or configuration error
|
Configuration / Parameter Fault | View Details |
| – |
Brine tank is full of water but salt does not dissolve properly
|
Salt Mushing / Brine Saturation Problem | View Details |
| – |
Brine tank overflows or water level is consistently very high
|
Brine Tank Overflow | View Details |
| – |
Cillit softener does not use any salt over weeks of operation
|
No Brine Draw / Regeneration Not Occurring | View Details |
| – |
Display is on but buttons do not respond or respond intermittently
|
Keypad / User Interface Fault | View Details |
| – |
Salt forms a hard crust (salt bridge) in the Cillit brine tank and water level stays low underneath
|
Salt Bridging in Brine Tank | View Details |
| – |
Softener causes a salty taste in the cold water after regeneration
|
Excessive Brine Carryover | View Details |
| – |
Softener causes low water pressure or flow in the house, especially during service mode
|
Flow Restriction Through Softener | View Details |
| – |
Softener does not start at all (no display, no lights)
|
No Power / Electrical Supply Fault | View Details |
| – |
Softener emits a persistent plastic or chemical smell around the unit
|
Overheating Electronics / New Plastic Odor | View Details |
| – |
Softener installed but some outlets remain hard while others are soft
|
Partial Bypass / Cross‑Connection | View Details |
| – |
Softener installed but taps deliver only soft water; no hard water line available where required (e.g., kitchen drinking tap)
|
Incorrect Plumbing / Bypass Configuration | View Details |
| – |
Softener is noisy during regeneration (loud banging, hammering, or whistling)
|
Hydraulic Shock / Valve Noise | View Details |
| – |
Softener makes grinding or clicking noises from the valve head during regeneration
|
Drive Gear / Motor Wear | View Details |
| – |
Softener occasionally delivers bursts of discolored (brown/yellow) water after regeneration
|
Resin Fouling / Iron Discharge | View Details |
| – |
Softener regenerates at the wrong time of day (e.g., midday instead of night)
|
Clock / Time Setting Issue | View Details |
| – |
Softener regenerates too often, causing excessive salt and water consumption
|
Over‑Regeneration / Incorrect Capacity Setting | View Details |
| – |
Water leaks from around the Cillit control valve head or between valve and tank
|
Valve Head / Tank O‑Ring Leak | View Details |
| – |
Water leaks from the brine line connections or brine well
|
Brine Line / Fitting Leak | View Details |
| – |
Water remains hard at taps even though the Cillit softener appears to run normally (no error code)
|
Bypass or Mixing Valve Misadjustment | View Details |
No matching codes found
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