Marlo
Marlo 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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Err1
Control display shows Err1 and unit will not start a regeneration cycle
Turbine / Flow Sensor Signal Fault
Err2
Display shows Err2 and regeneration stops mid-cycle
Motor / Cam Position Fault
Err3
Display shows Err3 and unit will not complete regeneration; valve appears stuck in one position
Rotor/Seal Pack Positioning Error
Err4
Display shows Err4 and brine draw does not occur during regeneration
Brine System / Vacuum Fault
Err5
Display shows Err5 and unit does not refill brine tank at the end of regeneration
Brine Refill / Refill Valve Fault
Err6
Display shows Err6 and time-of-day or regeneration schedule will not hold settings
Real-Time Clock / Memory Fault
Err7
Display shows Err7 and unit will not accept programming changes
Keypad / User Interface Fault
Err8
Display shows Err8 and unit locks out regeneration cycles
Program Configuration / Parameter Error
Err9
Display shows Err9 and unit shows no flow even when water is being used
Flow Meter Calibration / Range Error
HiFlow
Display shows HiFlow or High Flow alarm during heavy water use
Excessive Flow Rate / Bypass or Plumbing Issue
LoSalt
Display shows LoSalt or Low Salt warning; softener may eventually deliver hard water
Low Salt Level / Brine Concentration Warning
LowPSI
Display shows LowPSI or Low Pressure; regeneration may abort
Insufficient Inlet Water Pressure
NoFlow
Display shows NoFlow even when faucets are open; regeneration may not trigger on demand
Flow Detection Failure
NoSalt
Display shows NoSalt and water hardness increases rapidly between regenerations
Empty Brine Tank / No Brine Production
Power
Display shows Power Error or flickers; unit resets unexpectedly
Power Supply / Transformer Fault
Service
Display shows Service or Call for Service; unit may continue to operate but with limited functions
General Service Reminder / Non-Specific Fault
Symptom
Brine tank does not refill with water after regeneration; salt remains dry
No Brine Refill
Symptom
Brine tank overflows or fills with too much water after regeneration
Brine Tank Overfill / Refill Control Failure
Symptom
Display is on but very dim or segments are missing
Display / LCD Failure
Symptom
Softened water appears cloudy or milky immediately after installation or resin service
Air Entrapment / Fine Particulate Release
Symptom
Softened water has a metallic or rusty taste and orange staining appears despite softener operation
Iron Breakthrough / Resin Iron Fouling
Symptom
Softened water has a rotten egg (sulfur) odor
Hydrogen Sulfide in Water / Bacterial Contamination
Symptom
Softened water has a salty taste after regeneration
Excessive Brine Carryover
Symptom
Softener bypass valve is difficult to turn or leaks when moved between service and bypass
Bypass Valve Wear / Seal Failure
Symptom
Softener causes noticeable drop in water pressure throughout the house
Flow Restriction Through Softener
Symptom
Softener causes water hammer or banging pipes when starting or ending regeneration
Hydraulic Shock / Rapid Valve Transition
Symptom
Softener display is blank; unit appears completely dead
No Power to Control
Symptom
Softener does not draw brine from the brine tank during regeneration; water level never drops
No Brine Draw / Injector Vacuum Failure
Symptom
Softener does not regenerate at scheduled time; display shows correct time but no cycle starts
Regeneration Timer / Scheduling Failure
Symptom
Softener emits a persistent humming noise even when not regenerating
Transformer / Motor Hum
Symptom
Softener leaks water from around the control valve head on top of the mineral tank
Valve Head O-Ring / Tank Neck Seal Leak
Symptom
Softener makes loud clicking or grinding noises during regeneration
Drive Motor / Gear Train Noise
Symptom
Softener mineral tank appears to be leaking from the side wall (not from fittings or top)
Mineral Tank Structural Failure
Symptom
Softener mineral tank makes a roaring or churning noise during backwash
Aggressive Backwash / Media Bed Disturbance
Symptom
Softener stuck in regeneration; water runs to drain continuously and unit does not return to service
Valve Stuck in Backwash/Rinse Position
Symptom
Softener uses excessive salt compared to expected consumption
High Salt Usage / Over-Regeneration
Symptom
Softener uses very little or no salt over time
Low Salt Usage / Under-Regeneration
Symptom
Softener will not start regeneration at all; pressing manual regen button has no effect
Manual Regeneration Initiation Failure
Symptom
Water leaks from the drain line continuously even when the softener is in service mode
Internal Drain Valve Leak
Symptom
Water remains hard even though the Marlo softener appears to regenerate normally
Resin Bed Exhaustion / Resin Fouling
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| Err1 |
Control display shows Err1 and unit will not start a regeneration cycle
|
Turbine / Flow Sensor Signal Fault | View Details |
| Err2 |
Display shows Err2 and regeneration stops mid-cycle
|
Motor / Cam Position Fault | View Details |
| Err3 |
Display shows Err3 and unit will not complete regeneration; valve appears stuck in one position
|
Rotor/Seal Pack Positioning Error | View Details |
| Err4 |
Display shows Err4 and brine draw does not occur during regeneration
|
Brine System / Vacuum Fault | View Details |
| Err5 |
Display shows Err5 and unit does not refill brine tank at the end of regeneration
|
Brine Refill / Refill Valve Fault | View Details |
| Err6 |
Display shows Err6 and time-of-day or regeneration schedule will not hold settings
|
Real-Time Clock / Memory Fault | View Details |
| Err7 |
Display shows Err7 and unit will not accept programming changes
|
Keypad / User Interface Fault | View Details |
| Err8 |
Display shows Err8 and unit locks out regeneration cycles
|
Program Configuration / Parameter Error | View Details |
| Err9 |
Display shows Err9 and unit shows no flow even when water is being used
|
Flow Meter Calibration / Range Error | View Details |
| HiFlow |
Display shows HiFlow or High Flow alarm during heavy water use
|
Excessive Flow Rate / Bypass or Plumbing Issue | View Details |
| LoSalt |
Display shows LoSalt or Low Salt warning; softener may eventually deliver hard water
|
Low Salt Level / Brine Concentration Warning | View Details |
| LowPSI |
Display shows LowPSI or Low Pressure; regeneration may abort
|
Insufficient Inlet Water Pressure | View Details |
| NoFlow |
Display shows NoFlow even when faucets are open; regeneration may not trigger on demand
|
Flow Detection Failure | View Details |
| NoSalt |
Display shows NoSalt and water hardness increases rapidly between regenerations
|
Empty Brine Tank / No Brine Production | View Details |
| Power |
Display shows Power Error or flickers; unit resets unexpectedly
|
Power Supply / Transformer Fault | View Details |
| Service |
Display shows Service or Call for Service; unit may continue to operate but with limited functions
|
General Service Reminder / Non-Specific Fault | View Details |
| – |
Brine tank does not refill with water after regeneration; salt remains dry
|
No Brine Refill | View Details |
| – |
Brine tank overflows or fills with too much water after regeneration
|
Brine Tank Overfill / Refill Control Failure | View Details |
| – |
Display is on but very dim or segments are missing
|
Display / LCD Failure | View Details |
| – |
Softened water appears cloudy or milky immediately after installation or resin service
|
Air Entrapment / Fine Particulate Release | View Details |
| – |
Softened water has a metallic or rusty taste and orange staining appears despite softener operation
|
Iron Breakthrough / Resin Iron Fouling | View Details |
| – |
Softened water has a rotten egg (sulfur) odor
|
Hydrogen Sulfide in Water / Bacterial Contamination | View Details |
| – |
Softened water has a salty taste after regeneration
|
Excessive Brine Carryover | View Details |
| – |
Softener bypass valve is difficult to turn or leaks when moved between service and bypass
|
Bypass Valve Wear / Seal Failure | View Details |
| – |
Softener causes noticeable drop in water pressure throughout the house
|
Flow Restriction Through Softener | View Details |
| – |
Softener causes water hammer or banging pipes when starting or ending regeneration
|
Hydraulic Shock / Rapid Valve Transition | View Details |
| – |
Softener display is blank; unit appears completely dead
|
No Power to Control | View Details |
| – |
Softener does not draw brine from the brine tank during regeneration; water level never drops
|
No Brine Draw / Injector Vacuum Failure | View Details |
| – |
Softener does not regenerate at scheduled time; display shows correct time but no cycle starts
|
Regeneration Timer / Scheduling Failure | View Details |
| – |
Softener emits a persistent humming noise even when not regenerating
|
Transformer / Motor Hum | View Details |
| – |
Softener leaks water from around the control valve head on top of the mineral tank
|
Valve Head O-Ring / Tank Neck Seal Leak | View Details |
| – |
Softener makes loud clicking or grinding noises during regeneration
|
Drive Motor / Gear Train Noise | View Details |
| – |
Softener mineral tank appears to be leaking from the side wall (not from fittings or top)
|
Mineral Tank Structural Failure | View Details |
| – |
Softener mineral tank makes a roaring or churning noise during backwash
|
Aggressive Backwash / Media Bed Disturbance | View Details |
| – |
Softener stuck in regeneration; water runs to drain continuously and unit does not return to service
|
Valve Stuck in Backwash/Rinse Position | View Details |
| – |
Softener uses excessive salt compared to expected consumption
|
High Salt Usage / Over-Regeneration | View Details |
| – |
Softener uses very little or no salt over time
|
Low Salt Usage / Under-Regeneration | View Details |
| – |
Softener will not start regeneration at all; pressing manual regen button has no effect
|
Manual Regeneration Initiation Failure | View Details |
| – |
Water leaks from the drain line continuously even when the softener is in service mode
|
Internal Drain Valve Leak | View Details |
| – |
Water remains hard even though the Marlo softener appears to regenerate normally
|
Resin Bed Exhaustion / Resin Fouling | View Details |
No matching codes found
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