Water Softener Repair: How to Fix Common Problems Yourself
Quick answer: most water softener problems come from a short list of causes you can check yourself: no salt or a salt bridge, the bypass valve left open, a power cut that reset the clock, a plugged injector or drain line, low water pressure, or worn seals inside the control valve. Pentair’s troubleshooting table for the Fleck 5600SXT, one of the most common softener valves, lists these same causes. Work through them in the order below before you pay for a service call. Use the troubleshooter to get the list for your symptom.
What you’ll need: hardness test strips, a flashlight, a broom handle, your softener’s manual, and for some problems a water pressure gauge.
How we wrote this: we haven’t repaired these softeners ourselves. The causes and fixes come from the troubleshooting tables in Pentair’s Fleck 5600SXT service manual, Whirlpool’s, Rheem’s, A. O. Smith’s and Clack’s manuals, and GE’s support pages.
Before you start: shut it off safely
Pentair’s service instructions for the Fleck 5600SXT start every repair the same way:
- Turn off the water to the softener. Put the bypass valve in the bypass position, or with a three-valve bypass, open the bypass line and close the softener’s inlet and outlet valves.
- Relieve the pressure. On a Fleck valve, step the control into the backwash position for a moment, then back to service.
- Unplug the softener.
Other brands differ, so follow your own manual. Rheem warns never to use a sharp tool on a salt bridge or pound on the tank, which can damage it. If a repair means cutting pipes, working on wiring or lifting out a resin tank, or the softener is still under warranty, call the maker or a licensed plumber first.
Water softener troubleshooter
Pick what’s wrong and your type of softener. You’ll get the causes to check, easiest first, and what to buy if a part is worn.
Water is hard again: check these in order
Choose your symptom and softener type to see the checklist.
Easy no tools or parts · Moderate basic tools, follow the manual · Pro call the maker or a plumber
Water softener problems at a glance
| What you notice | Check first | Full guide |
|---|---|---|
| Hard water again | Salt, bypass valve, clock, salt bridge, hardness setting | Below |
| Salt level not dropping | Salt bridge, then whether it regenerates and draws brine | Below |
| Too much water in the salt tank | Drain hose, injector, water pressure | Brine tank guide |
| Salty water | Drain line, water pressure, injector | Salty water guide |
| Drains nonstop | Whether it’s just regenerating, then the valve | Below |
| Low water pressure | Debris or iron in the valve and pipes | Below |
| Beads in the water | Where they turn up: drain or taps | Resin beads guide |
| Blank display or error code | Power, clock, the code’s meaning | Below |
Summarized from Pentair’s Fleck 5600SXT troubleshooting table and the Whirlpool, Rheem, A. O. Smith, Clack and GE sources listed at the end.
Water softener not softening (hard water again)
Confirm it first: test the softened water with a hardness strip. Then check these, in this order. Pentair lists each one for hard water on the Fleck 5600SXT.
- No salt. Add salt and keep the level above the water in the tank.
- Bypass valve open. Move it back to the service position. In bypass, hard water goes straight to your taps.
- Power cut. Reset the time of day so the softener regenerates when it should. A blank display means no power at all; check the plug, outlet and breaker.
- Salt bridge. A hard crust of salt can sit above an empty space, so no brine forms. Push a broom handle gently into the salt; if it stops on something hard, break the crust gently. See brine tank problems for the full test.
- Hardness setting too low. Retest your untreated water and reset the softener, adding iron if you have it. Our hardness settings guide shows how.
- Only the hot water is hard? Pentair says the water heater may need flushing several times.
- Plugged injector screen or slow brine fill. Clean the injector screen, check the brine tank fill time, and clean the brine line flow control if it’s plugged.
- Internal valve leak. Replace the seals and spacers, the piston, or both. See rebuilding the control valve.
- Worn or iron-coated resin. If the softener regenerates properly and the water is still hard, see resin replacement and water softener cleaners.
- Cracked distributor tube. Pentair says to make sure the tube isn’t cracked and to check its O-ring. That means opening the resin tank, so many owners leave it to a pro.
For a quick yes-or-no test, try the checker in how a water softener works.
Water softener not using salt
If the salt level never drops, the softener either isn’t regenerating or isn’t drawing brine. Rule out a salt bridge first, then work through Pentair’s list for a softener that “fails to draw brine”:
- Drain line flow control plugged. Clean it. Also check that the drain hose isn’t kinked or raised higher than your manual allows.
- Injector or injector screen plugged. Clean them (see cleaning the injector).
- Water pressure too low. Pentair says to raise line pressure to 20 psi; Whirlpool also gives 20 psi as its minimum. A pressure gauge on an outdoor tap tells you where you stand.
- Internal control leak. Change the seals, spacers and piston.
- Service adapter didn’t cycle. On Fleck valves, check the drive motor and switches, or have a pro do it.
A softener that isn’t regenerating at all usually has no power, a wrong clock or a fault code. On a Fleck SXT, Error 2 means it hasn’t regenerated in more than 99 days (see error codes).
Too much water in the brine tank, or salty water
Both usually mean brine isn’t being drawn out properly. Pentair lists a plugged drain line flow control, a plugged injector, a timer that isn’t cycling, and dirt in the brine valve or brine line flow control for too much water in the tank. It lists the same faults, plus low water pressure, for salt water in the service line. GE, Whirlpool, A. O. Smith and Clack add a kinked or raised drain hose, and Whirlpool warns against joining the drain line to the overflow with a tee.
Step-by-step fixes are in our guides to too much water in the brine tank and salty water from a softener, including each maker’s pressure minimum: Clack says at least 25 psi, A. O. Smith 30 psi and Whirlpool 20 psi.
Water softener won’t stop running
First make sure it isn’t just regenerating. Rheem says a recharge takes about 2 hours, and Whirlpool, Rheem and Fleck softeners start one at 2:00 a.m. by default (see water softener regeneration). If water keeps flowing to the drain long after that, Pentair lists these causes on the Fleck 5600SXT:
- The valve isn’t programming or positioning correctly. Check the timer program and the control’s position; replace the powerhead if it won’t position properly.
- Debris in the control. Remove the powerhead, inspect the bore, clear it, and check the control in each regeneration position.
- Internal control leak. Replace the seals and piston.
- The control cycles continuously. A misadjusted, broken or shorted switch. Find out whether the switch or timer is at fault and replace it, or replace the powerhead.
Low water pressure after a softener
Pentair lists three causes of lost pressure:
- Debris from recent plumbing work. Bits of pipe scale can break loose and plug the valve inlet. Remove the piston and clean the control.
- Iron in the pipe to the softener. Clean the line.
- Iron in the softener. Clean the control, add resin cleaner to the resin bed and regenerate more often. A cleaner such as Rust Out is made for this; see our cleaner guide for doses. If your water has a lot of iron, see softeners and filters for iron.
Resin beads in the water
Where the beads turn up tells you the cause. Beads in the drain line: Pentair blames air in the water system or a drain line flow control that’s the wrong size. Beads at your taps: Whirlpool and Rheem point to a cracked distributor tube or broken bottom basket inside the resin tank, and on their cabinet models the fix is a new resin tank assembly. GE adds that a softener plumbed backwards can push fines into the house. Our resin beads guide shows how to tell resin from sediment and what to replace.
Display problems and error codes
A blank display means no power: check the plug, outlet and breaker, then reset the clock and start a manual recharge. A flashing time usually means the power went off, so reset the time of day. Error codes depend on the valve; these are Pentair’s for the Fleck 5600SXT:
| Code | Meaning | What Pentair says to do |
|---|---|---|
| 0 | Cam sense error: the valve took longer than 6 minutes to reach its next position | Unplug it, check the cam switches, motor and drive train, and that the piston moves freely |
| 1 | Cycle step error: an unexpected cycle input | Check the cam switches and that the valve and system type are set correctly, then step through a manual regeneration |
| 2 | Regeneration failure: no regeneration for more than 99 days (7 days on a day-of-week setup) | Run a manual regeneration; on a metered valve, check the meter is reading flow and the settings are right |
| 3 | Memory error: control board memory failure | Do a master reset, reprogram the valve, then step through a manual regeneration |
From Pentair’s Fleck 5600SXT service manual (42684). If an error comes back, Pentair says to unplug the unit and contact technical support. For Whirlpool, Rheem, Clack and other valves, look the code up in your manual.
Leaks
- Water dribbling to the drain all the time is an internal leak, not an outside one: replace the seals and piston (Pentair).
- A leaking salt tank usually means a crack. Whirlpool’s fix is a new salt storage tank assembly; see replacing a brine tank.
- Leaks at the bypass or pipe connections: put the softener in bypass and reseat or replace the fitting. Your manual’s parts list gives the O-ring part numbers.
- A cracked resin tank needs replacing. Call the maker or a plumber, and see repair or replace before you pay for one.
How to clean the injector (nozzle and venturi)
The injector is a small jet that creates the suction that pulls brine into the resin tank. Whirlpool and Rheem call it the nozzle and venturi. If sand, silt or dirt plugs it, the softener can’t regenerate properly. It’s the fix behind hard water, unused salt, too much water in the salt tank and salty water.
- Put the softener in bypass and follow your manual.
- On Whirlpool cabinets, unscrew the cap, lift out the screen and disc, wash the parts in warm soapy water, and put them back with the gasket holes lined up.
- On Fleck 5600 valves, the injector and its screen are in the injector body, where the brine tube and drain line connect. Pentair’s service manual (page 28) shows how to take them out to clean or replace them.
- Run a manual regeneration and watch the salt tank: the water level should drop while it draws brine.
Rebuilding the control valve (seals and piston)
Seals and a piston wear out. Pentair lists them for hard water, a softener that won’t draw brine, and water that runs to the drain nonstop. A rebuild kit replaces just those parts, so you keep the rest of the valve.
- Fleck 5600: the rebuild kit includes the main piston (60102-00), seals and spacers (60125) and brine valve (60032). Check your valve before ordering: the softener piston (60102-00) is different from the filter piston (60102-10).
- Clack WS1: the rebuild kit includes the V3005 seal and spacer stack, V3011 main piston, V3174 regenerant piston and the V3193 service wrench used to open the valve.
- Cabinet models (Whirlpool, Rheem, GE, Morton): order seals and parts for your model number from the maker.
Take a photo before you take anything apart and follow your valve’s service manual. Afterwards, run a manual regeneration and check for leaks.
Repair or replace?
A fix that costs only salt, cleaning or a seal kit is almost always worth doing. This Old House says rust, cracks or leaks on the unit mean it’s time to consider a replacement, and the long-standing rule of thumb Consumer Reports used is to replace when a repair costs more than half the price of a new one. Our repair-or-replace calculator compares the two for you. If you hire someone, This Old House puts annual professional servicing at $150–$300, including cleaning, testing and minor repairs. If you do replace it, our best water softeners are picked by water type and home size.
Tools and parts we recommend
Varify water hardness test strips
Test the water before and after the softener. If the softened water still reads hard, you know the softener isn’t doing its job, and you can confirm a fix worked.
Check price on AmazonWatts water pressure test gauge (0–200 psi)
Screws onto an outdoor tap or washing machine valve. Low pressure stops a softener drawing brine; the makers’ minimums run from 20 to 30 psi.
Check price on AmazonFleck 5600 softener valve rebuild kit
Piston (60102-00), seals and spacers (60125) and brine valve (60032): the parts Pentair says to replace for an internal valve leak. If you only need the seals, there’s a 60125 seal and spacer kit on its own.
Good to know: match the piston to your valve; the filter version (60102-10) won’t work on a softener.
Check price on AmazonClack WS1 rebuild kit with service wrench
The V3005 seal and spacer stack, V3011 main piston, V3174 regenerant piston and V3193 wrench in one kit. More on the valve in our Clack WS1 review.
Check price on Amazon2310 brine tank safety float
The float assembly that sits in the brine well and shuts off the refill if the water rises too high. The listing says it fits Fleck and Clack softeners. Replace yours if it’s cracked or sticks after cleaning, and measure the brine well first, since floats come in different lengths.
Check price on AmazonPro Products Rust Out
A resin cleaner for iron, the “mineral cleaner” Pentair suggests when iron builds up in the softener. Follow the label’s dose; our cleaner guide covers the current amounts.
Check price on AmazonWhen to call a pro
- A cracked resin or salt tank, or a resin tank that needs lifting out.
- An error code that comes back after a reset. Pentair says to contact technical support.
- Plumbing changes, such as fixing a softener plumbed backwards or rerouting the drain.
- A softener under warranty. Check what the warranty needs from you before you open the valve.
Frequently asked questions
Why is my water softener not softening the water?
The most common causes are no salt, a salt bridge, the bypass valve left open or a reset clock after a power cut. After those, check the hardness setting, the injector and the valve seals. See water softener not softening.
How do I reset my water softener?
After a power cut, reset the time of day. Then run a manual regeneration: on Whirlpool and Rheem softeners, press and hold RECHARGE for 3 seconds; on a Fleck 5600SXT, press and hold Extra Cycle for 5 seconds. Other valves are in your manual and our regeneration guide.
Can I repair a water softener myself?
Most fixes, yes: adding salt, breaking a salt bridge, resetting the clock, cleaning the injector and replacing the brine float need no special skills. Rebuilding the valve is a moderate job with the right kit. Cracked tanks, wiring faults and plumbing changes are best left to a pro.
How much does water softener repair cost?
Many fixes cost nothing but salt or a cleaning, and a rebuild kit replaces only the parts that wear. If you hire someone, This Old House puts annual professional servicing at $150–$300. Compare any quote with a new softener in our repair-or-replace calculator.
Why did my water softener stop using salt?
Usually a salt bridge, or the softener isn’t drawing brine because of a plugged injector or drain line flow control, low water pressure or worn seals. See water softener not using salt.
How long should a water softener regeneration take?
Rheem says about 2 hours. If water still runs to the drain long after that, see water softener won’t stop running.
Related guides
- Water softener maintenance: monthly to yearly checklist
- How does a water softener work? (with an “is it working?” checker)
- How long do water softeners last? (repair or replace)
- Water in the brine tank: how much is normal
- Why does softened water taste salty?
- Resin beads in your water
- Best water softener cleaners
- Best water softener salt: pellets, crystals or potassium
Sources
- Pentair, Fleck 5600SXT downflow service manual (42684): troubleshooting (page 24), error codes (page 25) and service instructions (page 28).
- Whirlpool, WHES48 installation and operation manual (7392327 rev. D, 2023): nozzle and venturi, salt bridges, pressure, brine tank and troubleshooting.
- Rheem, RHS18 installation and operation manual (rev. G, 2025): power outages, salt bridges, recharge time and troubleshooting.
- A. O. Smith, AO-WH-SOFT-350C/400T/450T owner’s manual: troubleshooting.
- Clack Corporation, WS1 and WS1.25 drawings and service manual: troubleshooting and parts.
- GE Appliances, Particles or Resin Beads in Water Supply and Softened Water Tastes Salty.
- This Old House, How Much Does a Water Softener Cost? (updated June 2026): servicing costs and signs it’s time to replace.
- NerdWallet, When to Repair or Replace Your Appliances (Consumer Reports’ 50% rule).
- Amazon listings for the strips, gauge, rebuild kits, float and cleaner, checked November 2026.