US Water Systems
US Water Systems Water Softeners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
ERR BRINE
Display shows ERR BRINE or BRINE ERROR and regeneration does not complete properly
Brine System Fault
ERR COMM
Display shows ERR COMM or COMM ERROR on Wi-Fi/Bluetooth enabled US Water Systems softeners
Communication Module Fault
ERR DRAIN
Display shows ERR DRAIN or DRAIN ERROR and unit stalls during backwash or rinse
Drain Line Flow Fault
ERR POWER
Display shows ERR POWER or unit repeatedly resets after brief outages
Power Supply / Low Voltage Fault
ERR SALT SENSOR
US Water Systems softener with electronic salt sensor shows ERR SALT SENSOR or similar message
Salt Level Sensor Fault
ERR SENSOR
Display shows ERR SENSOR on advanced US Water Systems softeners with additional probes (e.g., leak sensor, temperature sensor)
Auxiliary Sensor Fault
ERR TIME
Display shows ERR TIME or clock will not keep correct time
Real-Time Clock / Backup Power Fault
ERR1
Control valve display shows ERR1 and softener will not start a regeneration cycle
Motor or Cam Indexing Fault
ERR2
Display shows ERR2 and regeneration stops mid-cycle on US Water Systems softener
Position Switch / Encoder Fault
ERR3
US Water Systems softener displays ERR3 and remains in service position, will not regenerate
Flow Meter / Turbine Sensor Fault
ERR4
Display shows ERR4 and valve stops in an unknown position during regeneration
Valve Position Not Found / Out-of-Range Fault
ERR5
US Water Systems softener shows ERR5 and will not accept new settings or loses time frequently
Control Board / Memory Fault
ERR6
Display shows ERR6 and the softener does not track water usage correctly
Meter Calibration / Configuration Error
LOW SALT
Display shows LOW SALT or SALT LOW warning on US Water Systems softener
Brine Tank Low Salt Condition
NO FLOW
Display shows NO FLOW even when water is being used in the home
Flow Detection Failure
NO SALT
Display shows NO SALT and water hardness increases after a few days
Empty Brine Tank / No Brine Production
Symptom
Brine tank overflows or is full of water
Brine Tank Overfill
Symptom
No water flow to the house when softener is in service mode
No Service Flow / Blocked Valve
Symptom
Softener brine tank develops a hard crust of salt (salt bridge) and stops softening
Salt Bridging in Brine Tank
Symptom
Softener brine tank forms a solid mass of salt at the bottom (salt mushing)
Salt Mushing in Brine Tank
Symptom
Softener causes iron staining even though hardness is removed
Iron Fouling / Inadequate Iron Removal
Symptom
Softener causes low water pressure throughout the house
Flow Restriction Through Softener
Symptom
Softener display is blank; unit appears completely dead
No Power to Control Head
Symptom
Softener display is on but buttons do not respond or respond intermittently
Keypad / User Interface Failure
Symptom
Softener does not regenerate at all; water gradually becomes hard
Regeneration Not Initiating
Symptom
Softener emits a constant hissing or trickling sound of water even when not regenerating
Continuous Water Flow Through Valve
Symptom
Softener is stuck in regeneration and does not return to service
Regeneration Cycle Stalled
Symptom
Softener leaks water from around the control valve
Control Valve External Leak
Symptom
Softener makes loud banging or knocking noises during regeneration
Water Hammer / Rapid Valve Movement
Symptom
Softener never regenerates automatically but will regenerate when forced manually
Automatic Regeneration Trigger Failure
Symptom
Softener produces salty-tasting water after regeneration
Excess Brine Carryover
Symptom
Softener regenerates at the wrong time of day (e.g., during peak water use)
Incorrect Regeneration Time / Programming
Symptom
Softener regenerates but water is still hard after regeneration
Insufficient Softening / Resin Capacity Loss
Symptom
Softener regenerates too frequently (daily or more) even with normal water use
Over-Frequent Regeneration
Symptom
Softener resin tank appears to be full of fine sand-like particles in plumbing fixtures
Resin Loss into Plumbing
Symptom
Softener uses no salt; salt level in brine tank never goes down
No Brine Draw During Regeneration
Symptom
Softener uses too much salt; salt level drops very quickly and salt consumption is high
Excessive Salt Usage
Symptom
Water leaks from the brine tank onto the floor
Brine Tank Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| ERR BRINE |
Display shows ERR BRINE or BRINE ERROR and regeneration does not complete properly
|
Brine System Fault | View Details |
| ERR COMM |
Display shows ERR COMM or COMM ERROR on Wi-Fi/Bluetooth enabled US Water Systems softeners
|
Communication Module Fault | View Details |
| ERR DRAIN |
Display shows ERR DRAIN or DRAIN ERROR and unit stalls during backwash or rinse
|
Drain Line Flow Fault | View Details |
| ERR POWER |
Display shows ERR POWER or unit repeatedly resets after brief outages
|
Power Supply / Low Voltage Fault | View Details |
| ERR SALT SENSOR |
US Water Systems softener with electronic salt sensor shows ERR SALT SENSOR or similar message
|
Salt Level Sensor Fault | View Details |
| ERR SENSOR |
Display shows ERR SENSOR on advanced US Water Systems softeners with additional probes (e.g., leak sensor, temperature sensor)
|
Auxiliary Sensor Fault | View Details |
| ERR TIME |
Display shows ERR TIME or clock will not keep correct time
|
Real-Time Clock / Backup Power Fault | View Details |
| ERR1 |
Control valve display shows ERR1 and softener will not start a regeneration cycle
|
Motor or Cam Indexing Fault | View Details |
| ERR2 |
Display shows ERR2 and regeneration stops mid-cycle on US Water Systems softener
|
Position Switch / Encoder Fault | View Details |
| ERR3 |
US Water Systems softener displays ERR3 and remains in service position, will not regenerate
|
Flow Meter / Turbine Sensor Fault | View Details |
| ERR4 |
Display shows ERR4 and valve stops in an unknown position during regeneration
|
Valve Position Not Found / Out-of-Range Fault | View Details |
| ERR5 |
US Water Systems softener shows ERR5 and will not accept new settings or loses time frequently
|
Control Board / Memory Fault | View Details |
| ERR6 |
Display shows ERR6 and the softener does not track water usage correctly
|
Meter Calibration / Configuration Error | View Details |
| LOW SALT |
Display shows LOW SALT or SALT LOW warning on US Water Systems softener
|
Brine Tank Low Salt Condition | View Details |
| NO FLOW |
Display shows NO FLOW even when water is being used in the home
|
Flow Detection Failure | View Details |
| NO SALT |
Display shows NO SALT and water hardness increases after a few days
|
Empty Brine Tank / No Brine Production | View Details |
| – |
Brine tank overflows or is full of water
|
Brine Tank Overfill | View Details |
| – |
No water flow to the house when softener is in service mode
|
No Service Flow / Blocked Valve | View Details |
| – |
Softener brine tank develops a hard crust of salt (salt bridge) and stops softening
|
Salt Bridging in Brine Tank | View Details |
| – |
Softener brine tank forms a solid mass of salt at the bottom (salt mushing)
|
Salt Mushing in Brine Tank | View Details |
| – |
Softener causes iron staining even though hardness is removed
|
Iron Fouling / Inadequate Iron Removal | View Details |
| – |
Softener causes low water pressure throughout the house
|
Flow Restriction Through Softener | View Details |
| – |
Softener display is blank; unit appears completely dead
|
No Power to Control Head | View Details |
| – |
Softener display is on but buttons do not respond or respond intermittently
|
Keypad / User Interface Failure | View Details |
| – |
Softener does not regenerate at all; water gradually becomes hard
|
Regeneration Not Initiating | View Details |
| – |
Softener emits a constant hissing or trickling sound of water even when not regenerating
|
Continuous Water Flow Through Valve | View Details |
| – |
Softener is stuck in regeneration and does not return to service
|
Regeneration Cycle Stalled | View Details |
| – |
Softener leaks water from around the control valve
|
Control Valve External Leak | View Details |
| – |
Softener makes loud banging or knocking noises during regeneration
|
Water Hammer / Rapid Valve Movement | View Details |
| – |
Softener never regenerates automatically but will regenerate when forced manually
|
Automatic Regeneration Trigger Failure | View Details |
| – |
Softener produces salty-tasting water after regeneration
|
Excess Brine Carryover | View Details |
| – |
Softener regenerates at the wrong time of day (e.g., during peak water use)
|
Incorrect Regeneration Time / Programming | View Details |
| – |
Softener regenerates but water is still hard after regeneration
|
Insufficient Softening / Resin Capacity Loss | View Details |
| – |
Softener regenerates too frequently (daily or more) even with normal water use
|
Over-Frequent Regeneration | View Details |
| – |
Softener resin tank appears to be full of fine sand-like particles in plumbing fixtures
|
Resin Loss into Plumbing | View Details |
| – |
Softener uses no salt; salt level in brine tank never goes down
|
No Brine Draw During Regeneration | View Details |
| – |
Softener uses too much salt; salt level drops very quickly and salt consumption is high
|
Excessive Salt Usage | View Details |
| – |
Water leaks from the brine tank onto the floor
|
Brine Tank Leak | View Details |
No matching codes found
Advertisements