Culligan
Culligan 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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Err 1
Control displays “Err 1” and softener will not start a regeneration cycle
Motor or Cam Position Error
Err 2
Display shows “Err 2” and regeneration stops mid-cycle
Position Switch / Encoder Fault
Err 3
Control shows “Err 3” and unit remains in service position without regenerating
Program Memory or Configuration Error
Err 4
Display shows “Err 4” and valve will not move into regeneration
Drive Motor Overload or Stall
Err 5
Control displays “Err 5” and time-of-day or regeneration schedule will not hold
Real-Time Clock or Power Backup Failure
Err 6
Display shows “Err 6” and unit may be stuck in brine draw or backwash
Cycle Timeout / Incomplete Regeneration
Err 7
Display shows “Err 7” and salt level or brine system alarm is active
Brine System / Salt Level Sensor Error
Err 8
Display shows “Err 8” and water usage is not being recorded correctly
Flow Meter / Turbine Sensor Failure
Err 9
Display shows “Err 9” and unit may not respond to keypad inputs
Keypad or User Interface Failure
Lo Brine
Display shows “Lo Brine” or “Low Brine” and regeneration may be incomplete
Insufficient Brine Volume
Lo Salt
Display shows “Lo Salt” or “Low Salt” warning
Low Salt Level Detected
No Flow
Display shows “No Flow” even when water is being used in the house
Flow Detection Failure
No Regen
Display shows “No Regen” or unit never regenerates automatically
Regeneration Inhibit or Scheduling Fault
Power Fail
Display shows “Power Fail” or flashes after an outage; time-of-day may be incorrect
Power Interruption / Backup Loss
Service
Display alternates between normal screen and “Service” or “Call for Service” message
General Service Required Indicator
Symptom
Brine tank is dry and never has water above the grid plate
No Brine Refill
Symptom
Brine tank overflows with water or is excessively full after regeneration
Brine Refill or Float Safety Failure
Symptom
No water flow to the house when softener is in service position
Blocked Valve or Bypass Mispositioned
Symptom
Salt forms a hard crust (salt bridge) in the Culligan brine tank
Salt Bridging
Symptom
Softener appears to regenerate too early or too late based on water usage
Incorrect Metered Capacity or Reserve Setting
Symptom
Softener bypass valve is hard to turn or leaks when moved
Worn or Seized Bypass Valve
Symptom
Softener causes air spurting from faucets after regeneration
Air in Plumbing from Drain or Brine System
Symptom
Softener causes water hammer or banging pipes during regeneration
Rapid Valve Shifts Causing Pressure Surges
Symptom
Softener control display is blank or intermittently turns off
Loss of Control Power
Symptom
Softener does not use any salt over weeks of operation
No Brine Draw or No Regeneration
Symptom
Softener is stuck in regeneration and continuously runs water to drain
Valve Stuck in Backwash or Rinse
Symptom
Softener makes loud clicking, grinding, or knocking noises during regeneration
Mechanical Drive or Gear Damage
Symptom
Softener regenerates at the wrong time of day (e.g., during peak water use)
Incorrect Time-of-Day or Regen Time Setting
Symptom
Softener uses excessive salt and regenerates too frequently
Over-Regeneration / Misprogrammed Capacity
Symptom
Softener will not start a manual regeneration when the button is pressed
Manual Regeneration Initiation Failure
Symptom
Strong rotten egg (sulfur) odor in hot water even with a Culligan softener installed
Hydrogen Sulfide Reaction with Water Heater Anode
Symptom
Visible resin beads appear in household faucets, aerators, or toilet tanks
Resin Loss from Softener Tank
Symptom
Water has a salty taste after regeneration
Excess Brine Carryover
Symptom
Water leaks from around the Culligan control valve head
Valve Body or O-Ring Leakage
Symptom
Water leaks from the brine tank or around the brine well
Brine Tank or Fitting Leak
Symptom
Water pressure is noticeably low only when flowing through the softener
Flow Restriction Through Valve or Resin Bed
Symptom
Water remains hard even though the Culligan softener appears to run normally
Resin Bed Exhaustion or Fouling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| Err 1 |
Control displays “Err 1” and softener will not start a regeneration cycle
|
Motor or Cam Position Error | View Details |
| Err 2 |
Display shows “Err 2” and regeneration stops mid-cycle
|
Position Switch / Encoder Fault | View Details |
| Err 3 |
Control shows “Err 3” and unit remains in service position without regenerating
|
Program Memory or Configuration Error | View Details |
| Err 4 |
Display shows “Err 4” and valve will not move into regeneration
|
Drive Motor Overload or Stall | View Details |
| Err 5 |
Control displays “Err 5” and time-of-day or regeneration schedule will not hold
|
Real-Time Clock or Power Backup Failure | View Details |
| Err 6 |
Display shows “Err 6” and unit may be stuck in brine draw or backwash
|
Cycle Timeout / Incomplete Regeneration | View Details |
| Err 7 |
Display shows “Err 7” and salt level or brine system alarm is active
|
Brine System / Salt Level Sensor Error | View Details |
| Err 8 |
Display shows “Err 8” and water usage is not being recorded correctly
|
Flow Meter / Turbine Sensor Failure | View Details |
| Err 9 |
Display shows “Err 9” and unit may not respond to keypad inputs
|
Keypad or User Interface Failure | View Details |
| Lo Brine |
Display shows “Lo Brine” or “Low Brine” and regeneration may be incomplete
|
Insufficient Brine Volume | View Details |
| Lo Salt |
Display shows “Lo Salt” or “Low Salt” warning
|
Low Salt Level Detected | View Details |
| No Flow |
Display shows “No Flow” even when water is being used in the house
|
Flow Detection Failure | View Details |
| No Regen |
Display shows “No Regen” or unit never regenerates automatically
|
Regeneration Inhibit or Scheduling Fault | View Details |
| Power Fail |
Display shows “Power Fail” or flashes after an outage; time-of-day may be incorrect
|
Power Interruption / Backup Loss | View Details |
| Service |
Display alternates between normal screen and “Service” or “Call for Service” message
|
General Service Required Indicator | View Details |
| – |
Brine tank is dry and never has water above the grid plate
|
No Brine Refill | View Details |
| – |
Brine tank overflows with water or is excessively full after regeneration
|
Brine Refill or Float Safety Failure | View Details |
| – |
No water flow to the house when softener is in service position
|
Blocked Valve or Bypass Mispositioned | View Details |
| – |
Salt forms a hard crust (salt bridge) in the Culligan brine tank
|
Salt Bridging | View Details |
| – |
Softener appears to regenerate too early or too late based on water usage
|
Incorrect Metered Capacity or Reserve Setting | View Details |
| – |
Softener bypass valve is hard to turn or leaks when moved
|
Worn or Seized Bypass Valve | View Details |
| – |
Softener causes air spurting from faucets after regeneration
|
Air in Plumbing from Drain or Brine System | View Details |
| – |
Softener causes water hammer or banging pipes during regeneration
|
Rapid Valve Shifts Causing Pressure Surges | View Details |
| – |
Softener control display is blank or intermittently turns off
|
Loss of Control Power | View Details |
| – |
Softener does not use any salt over weeks of operation
|
No Brine Draw or No Regeneration | View Details |
| – |
Softener is stuck in regeneration and continuously runs water to drain
|
Valve Stuck in Backwash or Rinse | View Details |
| – |
Softener makes loud clicking, grinding, or knocking noises during regeneration
|
Mechanical Drive or Gear Damage | View Details |
| – |
Softener regenerates at the wrong time of day (e.g., during peak water use)
|
Incorrect Time-of-Day or Regen Time Setting | View Details |
| – |
Softener uses excessive salt and regenerates too frequently
|
Over-Regeneration / Misprogrammed Capacity | View Details |
| – |
Softener will not start a manual regeneration when the button is pressed
|
Manual Regeneration Initiation Failure | View Details |
| – |
Strong rotten egg (sulfur) odor in hot water even with a Culligan softener installed
|
Hydrogen Sulfide Reaction with Water Heater Anode | View Details |
| – |
Visible resin beads appear in household faucets, aerators, or toilet tanks
|
Resin Loss from Softener Tank | View Details |
| – |
Water has a salty taste after regeneration
|
Excess Brine Carryover | View Details |
| – |
Water leaks from around the Culligan control valve head
|
Valve Body or O-Ring Leakage | View Details |
| – |
Water leaks from the brine tank or around the brine well
|
Brine Tank or Fitting Leak | View Details |
| – |
Water pressure is noticeably low only when flowing through the softener
|
Flow Restriction Through Valve or Resin Bed | View Details |
| – |
Water remains hard even though the Culligan softener appears to run normally
|
Resin Bed Exhaustion or Fouling | View Details |
No matching codes found
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