When a softener stops softening, the cause is usually one of a short list: no salt, a salt bridge, a bypass that isn’t fully in service, a power interruption, a clogged part in the brine system, or a setting that no longer matches your water. This guide pulls together the troubleshooting charts from three makers’ own materials (all checked Nov 3, 2026): the Pentair Fleck 5600SXT service manual, the Franklin Water Treatment SWS1 manual, and Morton Water Softeners’ troubleshooting guide. We haven’t repaired a softener ourselves, so this is a summary of what the makers say. If your own manual disagrees with anything here, follow the manual, and call the maker or a local dealer for anything inside the valve.
The short answer
- Start with the free checks. Salt in the tank, bypass in the service position, power on an outlet that’s never switched off, and the clock set correctly. All three makers list these first.
- If the salt level isn’t dropping, suspect a salt bridge or a bypass left open. Our salt guide covers how to break a bridge safely.
- Too much water in the brine tank points to a clogged drain line flow control, injector, or brine line part, or a plumbing mistake such as the drain hose connected to the overflow.
- Before you take anything apart, unplug it and put it in bypass, and read your manual’s steps. Valves, seals, and pistons are where DIY repairs go wrong.
- Confirm the fix with a hardness test of the water after the softener, using the same method you used before. Our hardness guide explains the options.
First, rule out the easy things
These show up on all three charts, so check them before anything else:
- Is there salt, and is it above the water? The Fleck manual’s fix for hard water caused by an empty brine tank is to “add salt to brine tank and maintain salt level above water level.” Morton’s guide says to refill and start an immediate recharge.
- Is the bypass in the service position? Fleck lists an open bypass as the first cause of hard water. Franklin says to verify the bypass is in “Service,” and notes a bypass that is leaking can cause the same problem. Morton lists it under “salt level is not dropping.”
- Does the softener have steady power? Franklin’s first cause for hard water is a softener plugged into an outlet “without power or one that is tied to a switch.” Fleck lists interrupted electrical service as a reason a unit fails to regenerate, and says that after a power failure you reset the time of day. If the display is blank, Morton says to check the transformer and breaker, then reset the clock and use its “Recharge Now” feature.
- Is the time right? Morton says a wrong clock setting is a cause of hard water at certain times, and Franklin lists a wrong time or a power outage as the reason a softener regenerates at the wrong time of day.
- Has your water changed? Morton says to test the unsoftened water for hardness and iron, then reprogram the softener to match. A well that has gotten harder, or one with iron, can outrun a setting made years ago. Our sizing calculator shows how hardness and household size change the numbers.
Symptom: hard water
All the time, and the salt level isn’t going down
This usually means the softener isn’t pulling brine at all. Causes listed across the three sources:
- A salt bridge. Morton lists a bridged tank first. Franklin suggests hitting the side of the brine tank with a rubber mallet to break one up. Morton warns not to use sharp or pointed tools because they can puncture the tank.
- The bypass is open, or the hardness setting is too low (Morton).
- Brine isn’t drawing. Fleck’s chart for a softener that “fails to draw brine” lists a plugged drain line flow control, a plugged injector or injector screen, low line pressure (it says to restore at least 20 psi), an internal control leak, and a service adapter that didn’t cycle. Franklin’s chart adds debris in the brine line flow control, a missing brine line flow control button, or a missing brine stem in the piston.
- A plugged or kinked drain hose. Morton says to remove kinks, sharp bends, or blockages. Franklin names drain lines that are plugged, frozen, kinked, overhead, too small a diameter, or longer than 15 feet. Our installation checklist covers the drain line rules.
Salt is going down, but the water is still hard
- A leak inside the valve. Fleck lists an internal valve leak (replace seals, spacers, and piston) or a cracked distributor tube or bad O-ring. Morton lists the inner valve and the O-rings between the valve and the tank.
- The softener is too small, or the valve is programmed wrong. Franklin lists an improperly sized softener for actual service flow rates and incorrect valve programming. Check the settings against your hardness and household; see our sizing guide.
- A meter problem on a metered valve. Franklin lists a disconnected meter cable. On a Fleck, a metered unit that isn’t measuring flow can end up showing error code 2, “Regen Failure,” which the manual says appears when it hasn’t regenerated in 99 days (or 7 in day-of-week mode). It tells you to run a manual regeneration to clear it and verify that the meter is measuring flow.
- Resin that has worn out. None of these charts is about resin age, but resin does wear. See our resin life guide.
Only the hot water is hard
Both Fleck and Morton point to the water heater. Fleck’s chart lists “hot water tank hardness” and says repeated flushing of the hot water tank is required. Morton adds that if anyone uses water during a regeneration, “the water heater will fill with hard water.” Our water heater guide covers scale, anode rods, and why a softener changes how often the heater needs attention. Another cause Morton lists is a leaking faucet or toilet valve, which wastes water and can use up capacity quickly.
Hard water only sometimes
Look at timing: a wrong clock, water use during a regeneration, a recent increase in hardness, and leaks are the causes Morton lists. If regenerations happen in the middle of the day, reset the time first.
Symptom: too much water in the brine tank
A tank with more water than you expect, or water over the salt, is a sign the brine system isn’t draining or refilling correctly. Fleck calls it “excessive water in brine tank,” and lists these causes:
- Plugged drain line flow control
- Plugged injector or injector screen
- Timer not cycling
- Foreign material in the brine valve
- Foreign material in the brine line flow control
Franklin’s chart for “brine tank overfills or does not draw brine” adds several plumbing-side causes worth checking before anything else:
- Loose nuts at either end of the brine line.
- The brine line inserted into the brine tank overflow fitting instead of the safety brine valve.
- The softener’s drain line connected to the brine overflow fitting or overflow drain line. Franklin’s chart says to verify they are separate, which matches the install rules in our installation checklist.
- A dirty brine tank.
Fleck’s manual also says a softener with excessive water in the brine tank may use too much salt. Both Fleck and Franklin say the fix for most plugged parts is to clean them: the injector, injector screen, and flow controls. Franklin describes putting the softener into a manual backwash cycle and then unplugging the transformer for 20 to 30 minutes (its chart varies by problem) to shake loose debris in the valve. It’s written for that valve, so follow your own manual’s version. If your tank was once fine and is now full of water, a small piece of debris in the injector or flow control is the first thing both charts suggest.
Symptom: salty water
Franklin’s chart lists the causes of salty-tasting softened water:
- A brine tank that is overfilled
- Drain line problems (the same ones as above)
- A short rinse cycle
- A salt setting that is too high
- A distributor tube that isn’t seated in the control valve, or is too short
- Low water pressure (it says to verify at least 25 psi)
Franklin tells readers to contact technical support to check or adjust the rinse cycle and salt setting. Our salt settings guide explains how the salt setting affects both salt use and the amount of brine left to rinse out.
Symptom: low water pressure
Fleck and Franklin both list iron or sediment buildup in the softener as a cause. Fleck also lists iron buildup in the supply line to the softener, and an inlet plugged by “foreign material broken loose from pipes by recent work done on plumbing system.” The fixes in the Fleck chart include cleaning the control and adding mineral cleaner to the resin bed, and regenerating more often. Franklin’s chart for low pressure says to increase backwash frequency by changing the hardness setting, and to verify at least 25 psi of line pressure, since low incoming pressure or a weak pump can also be the cause.
If you have iron, see our iron and manganese guide. Resin beads in your faucet aerators are a different problem: Franklin lists the softener being installed backwards or a damaged distributor basket as causes. Fleck lists loss of mineral through the drain line, which it ties to air in the water system (well systems need a proper air eliminator) or a wrongly sized drain flow control.
Error codes and a blank display
Error codes are model specific, so use your own manual’s table. As examples:
- Fleck 5600SXT: codes 0 and 1 are about the valve drive or cycle inputs, 2 is “Regen Failure,” and 3 is a memory error. The manual’s recovery steps start with unplugging the unit and inspecting the powerhead.
- Franklin SWS1: codes 1001 to 1004 cover motor movement, stalls, and running too long; its fixes include re-seating the motor and drive bracket, then resetting the valve by holding its NEXT and REGEN buttons for three seconds.
- Morton: E1 to E4 point to wiring, the position switch, a jammed valve, or the motor. Its reset steps are to unplug the transformer, correct the problem, and plug it back in. Morton notes the code returns if the problem wasn’t fixed.
A blank display is, on all three, mostly a power problem: the transformer unplugged, a blown fuse or tripped breaker, a switched-off outlet, or a failed control board.
When to call for help
Anything involving the valve internals (seals, rotor, piston, spacers, motor, circuit board) is where manuals tell you to follow their parts instructions closely, and where a dealer visit often costs less than a mistake. In Minnesota, water conditioning work is licensed, with an exception for premises you own and occupy as a residence; see the installation checklist for the rule we found. Morton, Franklin, and Pentair each list a technical support route in their manuals or on their sites.
A softener that keeps failing on a well may also be fighting something in the water it wasn’t sized for, such as iron or hydrogen sulfide. A state-certified lab test is the way to know what’s in the water; see our hydrogen sulfide guide and iron guide. For a city supply, your utility’s annual water quality report (Consumer Confidence Report) is the place to start. For health questions, talk to your local health department.
If you’re shopping for a replacement, a softener is sized for your hardness and household. The Fleck 5600 SXT Metered is one common example; see our sizing guide for price and specs. NSF’s listings show no certified US Water Systems softener system (only NSF/ANSI 42 filter components), so if certification matters to you, compare certified softeners in NSF’s own listings; our NSF guide shows how.
Bottom line
Check salt, bypass, power, and the clock first. If the salt isn’t going down, look for a bridge. If the brine tank has too much water, clean the injector, screen, and flow controls and make sure the drain and brine lines are connected correctly. Re-test your softened water with a hardness test to confirm. Leave valve internals to your manual’s instructions or a dealer.
Sources (all checked Nov 3, 2026)
- Pentair, Fleck 5600SXT downflow service manual, Troubleshooting pages (hosted by US Water Systems)
- Franklin Water Treatment, SWS1 series manual, Troubleshooting pages (dealer-hosted copy)
- Morton Water Softeners, Troubleshooting Guide
- Morton Water Softeners, Common Maintenance and Salt Block/Bridge support article (salt bridge warning; checked Oct 31, 2026)
- Minnesota Revisor of Statutes, Minn. Stat. 326B.55 (water conditioning licensing; checked Oct 30, 2026)