RainSoft
RainSoft 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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E1
Control panel displays E1 and unit will not start a regeneration cycle
Inlet Valve / Flow Sensor Fault
E10
E10 displayed, no communication between display module and main control board
Display / Keypad Communication Fault
E11
E11 error, unit loses time and settings after short power outages
Backup Power / Real-Time Clock Fault
E12
E12 displayed, high salt usage and frequent regenerations
Programming / Meter Calibration Fault
E13
E13 error, unit fails to initiate regeneration at scheduled time
Timer / Scheduling Fault
E14
E14 displayed, drain runs continuously and unit never returns to service
Stuck in Regeneration / Drain Valve Fault
E15
E15 error, low or no water pressure to the home when softener is in service
Internal Bypass / Service Flow Restriction Fault
E16
E16 displayed, high conductivity or hardness detected after softener
Outlet Water Quality Sensor Fault
E17
E17 error, salt level sensor alarm or inaccurate salt level reading
Brine Tank Salt Level Sensor Fault
E18
E18 displayed, high temperature detected at control head
Overtemperature / Thermal Sensor Fault
E19
E19 error, excessive regeneration time or cycle does not complete within expected duration
Regeneration Timeout Fault
E2
E2 displayed and unit will not advance through regeneration stages
Motor / Cam Drive Fault
E20
E20 displayed, internal leak detected between soft and hard water paths
Internal Valve Leakage Fault
E3
E3 error and display frozen, regeneration stops mid-cycle
Position Switch / Encoder Fault
E4
E4 displayed, unit does not keep correct time or program settings
Control Board / Memory Fault
E5
E5 error and no water flow is registered on the display even when water is being used
Flow Meter / Turbine Signal Loss
E6
E6 displayed, unit regenerates at incorrect intervals or not at all based on usage
Metered Regeneration Logic Fault
E7
E7 error and brine tank does not fill with water before regeneration
Brine Fill Valve / Brine Refill Circuit Fault
E8
E8 displayed, unit stuck in brine draw and does not advance
Brine Draw / Ejector Vacuum Fault
E9
E9 error and brine tank overfills with water, sometimes overflowing
Brine Refill Overrun / Float Safety Fault
Symptom
Brine tank fills with too much water between regenerations (no code)
Brine Tank Overfill
Symptom
Buttons on control panel are unresponsive or require excessive force
Keypad / Membrane Failure
Symptom
Control display is blank or intermittent but outlet has power
Power Supply / Display Failure
Symptom
Salt bridges in brine tank causing intermittent hard water
Salt Bridging / Salt Mushing
Symptom
Softener causes noticeable drop in water pressure only when in service (bypass restores pressure)
Flow Restriction Through Resin Bed
Symptom
Softener causes salty taste in water after regeneration
Insufficient Rinse / Brine Carryover
Symptom
Softener cycles at the wrong time of day (e.g., regenerates during peak water use)
Time-of-Day / Clock Misconfiguration
Symptom
Softener does not draw brine from the brine tank during regeneration (no code)
Brine Draw Failure
Symptom
Softener does not regenerate at all unless manually started
Regeneration Trigger Failure
Symptom
Softener emits rotten egg or foul odor in water
Bacterial Growth / Sulfur Contamination
Symptom
Softener installed but water tastes metallic or has staining despite softening
Inadequate Iron/Manganese Removal by Softener
Symptom
Softener is stuck in regeneration and continuously sends water to drain (no code)
Valve Stuck in Regeneration
Symptom
Softener makes loud clicking or grinding noises during regeneration
Gear Train / Motor Noise
Symptom
Softener regenerates too frequently, wasting salt and water (no code)
Over-Regeneration
Symptom
Softener stuck in bypass internally (water remains hard even though bypass is in service position)
Internal Bypass Valve Failure
Symptom
Visible resin beads appear in household faucets and aerators
Resin Loss into Plumbing
Symptom
Water remains hard even after recent regeneration (no error code displayed)
Resin Exhaustion or Resin Fouling
Symptom
Water softener leaks from around the control head
Control Valve External Leak
Symptom
Water softener leaks from the brine tank or brine line connections
Brine System External Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Control panel displays E1 and unit will not start a regeneration cycle
|
Inlet Valve / Flow Sensor Fault | View Details |
| E10 |
E10 displayed, no communication between display module and main control board
|
Display / Keypad Communication Fault | View Details |
| E11 |
E11 error, unit loses time and settings after short power outages
|
Backup Power / Real-Time Clock Fault | View Details |
| E12 |
E12 displayed, high salt usage and frequent regenerations
|
Programming / Meter Calibration Fault | View Details |
| E13 |
E13 error, unit fails to initiate regeneration at scheduled time
|
Timer / Scheduling Fault | View Details |
| E14 |
E14 displayed, drain runs continuously and unit never returns to service
|
Stuck in Regeneration / Drain Valve Fault | View Details |
| E15 |
E15 error, low or no water pressure to the home when softener is in service
|
Internal Bypass / Service Flow Restriction Fault | View Details |
| E16 |
E16 displayed, high conductivity or hardness detected after softener
|
Outlet Water Quality Sensor Fault | View Details |
| E17 |
E17 error, salt level sensor alarm or inaccurate salt level reading
|
Brine Tank Salt Level Sensor Fault | View Details |
| E18 |
E18 displayed, high temperature detected at control head
|
Overtemperature / Thermal Sensor Fault | View Details |
| E19 |
E19 error, excessive regeneration time or cycle does not complete within expected duration
|
Regeneration Timeout Fault | View Details |
| E2 |
E2 displayed and unit will not advance through regeneration stages
|
Motor / Cam Drive Fault | View Details |
| E20 |
E20 displayed, internal leak detected between soft and hard water paths
|
Internal Valve Leakage Fault | View Details |
| E3 |
E3 error and display frozen, regeneration stops mid-cycle
|
Position Switch / Encoder Fault | View Details |
| E4 |
E4 displayed, unit does not keep correct time or program settings
|
Control Board / Memory Fault | View Details |
| E5 |
E5 error and no water flow is registered on the display even when water is being used
|
Flow Meter / Turbine Signal Loss | View Details |
| E6 |
E6 displayed, unit regenerates at incorrect intervals or not at all based on usage
|
Metered Regeneration Logic Fault | View Details |
| E7 |
E7 error and brine tank does not fill with water before regeneration
|
Brine Fill Valve / Brine Refill Circuit Fault | View Details |
| E8 |
E8 displayed, unit stuck in brine draw and does not advance
|
Brine Draw / Ejector Vacuum Fault | View Details |
| E9 |
E9 error and brine tank overfills with water, sometimes overflowing
|
Brine Refill Overrun / Float Safety Fault | View Details |
| – |
Brine tank fills with too much water between regenerations (no code)
|
Brine Tank Overfill | View Details |
| – |
Buttons on control panel are unresponsive or require excessive force
|
Keypad / Membrane Failure | View Details |
| – |
Control display is blank or intermittent but outlet has power
|
Power Supply / Display Failure | View Details |
| – |
Salt bridges in brine tank causing intermittent hard water
|
Salt Bridging / Salt Mushing | View Details |
| – |
Softener causes noticeable drop in water pressure only when in service (bypass restores pressure)
|
Flow Restriction Through Resin Bed | View Details |
| – |
Softener causes salty taste in water after regeneration
|
Insufficient Rinse / Brine Carryover | View Details |
| – |
Softener cycles at the wrong time of day (e.g., regenerates during peak water use)
|
Time-of-Day / Clock Misconfiguration | View Details |
| – |
Softener does not draw brine from the brine tank during regeneration (no code)
|
Brine Draw Failure | View Details |
| – |
Softener does not regenerate at all unless manually started
|
Regeneration Trigger Failure | View Details |
| – |
Softener emits rotten egg or foul odor in water
|
Bacterial Growth / Sulfur Contamination | View Details |
| – |
Softener installed but water tastes metallic or has staining despite softening
|
Inadequate Iron/Manganese Removal by Softener | View Details |
| – |
Softener is stuck in regeneration and continuously sends water to drain (no code)
|
Valve Stuck in Regeneration | View Details |
| – |
Softener makes loud clicking or grinding noises during regeneration
|
Gear Train / Motor Noise | View Details |
| – |
Softener regenerates too frequently, wasting salt and water (no code)
|
Over-Regeneration | View Details |
| – |
Softener stuck in bypass internally (water remains hard even though bypass is in service position)
|
Internal Bypass Valve Failure | View Details |
| – |
Visible resin beads appear in household faucets and aerators
|
Resin Loss into Plumbing | View Details |
| – |
Water remains hard even after recent regeneration (no error code displayed)
|
Resin Exhaustion or Resin Fouling | View Details |
| – |
Water softener leaks from around the control head
|
Control Valve External Leak | View Details |
| – |
Water softener leaks from the brine tank or brine line connections
|
Brine System External Leak | View Details |
No matching codes found
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