Aquasana
Aquasana 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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CF
Display shows 'CF' or 'Clean Filter', and flow is reduced through the softener.
Pre-Filter Clogged/Maintenance Reminder
E1
Control head display shows E1 and system will not start a regeneration cycle
Inlet Flow Sensor Failure
E2
Display shows E2 and regeneration will not complete or start
Motor or Valve Position Error
E3
Display shows E3 and unit stops mid-cycle during regeneration
Valve Position Sensor / Cam Switch Fault
E4
Display shows E4 and system will not run a regeneration cycle
Brine System Fault / Brine Draw Failure
E5
Display shows E5 and unit remains in service mode without softening properly
Programming / Memory Error
E6
Display shows E6, and the system does not track water usage correctly.
Metering/Usage Sensor Error
E7
Display shows E7, and backwash/regeneration stops prematurely.
Drain Line/Backwash Flow Error
E8
Display shows E8, and the unit will not respond to button presses.
Keypad/User Interface Failure
E9
Display shows E9, and the time-of-day or settings will not hold after power loss.
Backup Power/Real-Time Clock Failure
H1
Display shows H1, and water feels hard before the next scheduled regeneration.
High Hardness/Capacity Exceeded Warning
Lo
Display shows 'Lo' or a low-salt icon, and softening performance declines.
Low Salt Level Warning
Symptom
Aquasana softener brine tank overfills with water.
Brine Tank Overfill
Symptom
Aquasana softener bypass valve is hard to turn or leaks around the handle.
Bypass Valve Seal Wear or Damage
Symptom
Aquasana softener causes a metallic or chemical taste in cold water after installation.
New System Taste / Carbon Filter Saturation
Symptom
Aquasana softener causes a salty taste in water after regeneration.
Insufficient Rinse / Excess Brine Carryover
Symptom
Aquasana softener causes air spurting from faucets after regeneration.
Air in Plumbing from Softener
Symptom
Aquasana softener control display is blank (no lights, no response).
No Power to Control Head
Symptom
Aquasana softener control head shows condensation or water droplets inside the display window.
Moisture Intrusion into Control Head
Symptom
Aquasana softener display is on, but buttons do not respond or respond intermittently.
Keypad / Button Failure
Symptom
Aquasana softener does not regenerate at the programmed time (no sounds, no drain flow).
Regeneration Not Initiating
Symptom
Aquasana softener emits a burning smell, or the control head feels unusually hot.
Overheating Control Board or Power Adapter
Symptom
Aquasana softener emits a rotten egg (sulfur) odor in hot water only.
Hydrogen Sulfide Reaction in Water Heater
Symptom
Aquasana softener frequently trips a nearby GFCI outlet.
Electrical Ground Fault or Nuisance Tripping
Symptom
Aquasana softener installed, but water bypasses the unit (no softening effect at any time).
Incorrect Plumbing / Bypass Misconfiguration
Symptom
Aquasana softener is noisy during regeneration (loud banging, knocking, or whistling).
Water Hammer / Valve Noise
Symptom
Aquasana softener regenerates too frequently, wasting salt and water.
Over-Regeneration / Incorrect Capacity Setting
Symptom
Aquasana softener resin beads appear in household plumbing fixtures or aerators.
Resin Loss from Softener Tank
Symptom
Aquasana softener uses very little or no salt over several weeks.
No Brine Refill or No Regeneration
Symptom
Reduced water pressure or flow through the Aquasana softener during normal use.
Flow Restriction in Resin Bed or Pre-Filters
Symptom
The Aquasana softener continuously drains water to the drain line even when not regenerating.
Valve Stuck in Backwash or Brine Rinse
Symptom
The Aquasana softener will not draw brine from the brine tank during regeneration (brine level does not drop).
No Brine Draw/Suction Failure
Symptom
Water leaks from around the Aquasana control head on top of the resin tank.
Control Head O-Ring or Tank Neck Leak
Symptom
Water leaks from the Aquasana brine tank or around the brine line connection.
Brine Tank or Brine Line Leak
Symptom
Water remains hard even though the Aquasana softener appears to be operating normally (no error codes).
Ion Exchange Resin Exhaustion or Fouling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CF |
Display shows 'CF' or 'Clean Filter', and flow is reduced through the softener.
|
Pre-Filter Clogged/Maintenance Reminder | View Details |
| E1 |
Control head display shows E1 and system will not start a regeneration cycle
|
Inlet Flow Sensor Failure | View Details |
| E2 |
Display shows E2 and regeneration will not complete or start
|
Motor or Valve Position Error | View Details |
| E3 |
Display shows E3 and unit stops mid-cycle during regeneration
|
Valve Position Sensor / Cam Switch Fault | View Details |
| E4 |
Display shows E4 and system will not run a regeneration cycle
|
Brine System Fault / Brine Draw Failure | View Details |
| E5 |
Display shows E5 and unit remains in service mode without softening properly
|
Programming / Memory Error | View Details |
| E6 |
Display shows E6, and the system does not track water usage correctly.
|
Metering/Usage Sensor Error | View Details |
| E7 |
Display shows E7, and backwash/regeneration stops prematurely.
|
Drain Line/Backwash Flow Error | View Details |
| E8 |
Display shows E8, and the unit will not respond to button presses.
|
Keypad/User Interface Failure | View Details |
| E9 |
Display shows E9, and the time-of-day or settings will not hold after power loss.
|
Backup Power/Real-Time Clock Failure | View Details |
| H1 |
Display shows H1, and water feels hard before the next scheduled regeneration.
|
High Hardness/Capacity Exceeded Warning | View Details |
| Lo |
Display shows 'Lo' or a low-salt icon, and softening performance declines.
|
Low Salt Level Warning | View Details |
| – |
Aquasana softener brine tank overfills with water.
|
Brine Tank Overfill | View Details |
| – |
Aquasana softener bypass valve is hard to turn or leaks around the handle.
|
Bypass Valve Seal Wear or Damage | View Details |
| – |
Aquasana softener causes a metallic or chemical taste in cold water after installation.
|
New System Taste / Carbon Filter Saturation | View Details |
| – |
Aquasana softener causes a salty taste in water after regeneration.
|
Insufficient Rinse / Excess Brine Carryover | View Details |
| – |
Aquasana softener causes air spurting from faucets after regeneration.
|
Air in Plumbing from Softener | View Details |
| – |
Aquasana softener control display is blank (no lights, no response).
|
No Power to Control Head | View Details |
| – |
Aquasana softener control head shows condensation or water droplets inside the display window.
|
Moisture Intrusion into Control Head | View Details |
| – |
Aquasana softener display is on, but buttons do not respond or respond intermittently.
|
Keypad / Button Failure | View Details |
| – |
Aquasana softener does not regenerate at the programmed time (no sounds, no drain flow).
|
Regeneration Not Initiating | View Details |
| – |
Aquasana softener emits a burning smell, or the control head feels unusually hot.
|
Overheating Control Board or Power Adapter | View Details |
| – |
Aquasana softener emits a rotten egg (sulfur) odor in hot water only.
|
Hydrogen Sulfide Reaction in Water Heater | View Details |
| – |
Aquasana softener frequently trips a nearby GFCI outlet.
|
Electrical Ground Fault or Nuisance Tripping | View Details |
| – |
Aquasana softener installed, but water bypasses the unit (no softening effect at any time).
|
Incorrect Plumbing / Bypass Misconfiguration | View Details |
| – |
Aquasana softener is noisy during regeneration (loud banging, knocking, or whistling).
|
Water Hammer / Valve Noise | View Details |
| – |
Aquasana softener regenerates too frequently, wasting salt and water.
|
Over-Regeneration / Incorrect Capacity Setting | View Details |
| – |
Aquasana softener resin beads appear in household plumbing fixtures or aerators.
|
Resin Loss from Softener Tank | View Details |
| – |
Aquasana softener uses very little or no salt over several weeks.
|
No Brine Refill or No Regeneration | View Details |
| – |
Reduced water pressure or flow through the Aquasana softener during normal use.
|
Flow Restriction in Resin Bed or Pre-Filters | View Details |
| – |
The Aquasana softener continuously drains water to the drain line even when not regenerating.
|
Valve Stuck in Backwash or Brine Rinse | View Details |
| – |
The Aquasana softener will not draw brine from the brine tank during regeneration (brine level does not drop).
|
No Brine Draw/Suction Failure | View Details |
| – |
Water leaks from around the Aquasana control head on top of the resin tank.
|
Control Head O-Ring or Tank Neck Leak | View Details |
| – |
Water leaks from the Aquasana brine tank or around the brine line connection.
|
Brine Tank or Brine Line Leak | View Details |
| – |
Water remains hard even though the Aquasana softener appears to be operating normally (no error codes).
|
Ion Exchange Resin Exhaustion or Fouling | View Details |
No matching codes found
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