Water softener not softening: a 15-minute triage before you buy a single part

Check the bypass valve and the salt before you buy a single part. A valve bumped into Bypass, an empty brine tank or a hidden salt crust will stop a healthy softener cold. Each one takes minutes to fix.

If the bypass, the salt and the power all check out, the softener itself will tell you what's wrong. Watch whether the salt is dropping, whether water is piling up in the brine tank, and when the water turns hard. Each answer points to a different part. Work through the free checks in order, then match what you see to the list of clues.

Test the right tap before you trust the result

Run water from a cold indoor tap, such as the kitchen sink. Hot taps draw from the water heater, which stays full of old hard water until the household uses it up over the next few days. Outdoor spigots are often plumbed ahead of the softener on purpose, so they were never soft to begin with.

A cheap hardness test strip is better than judging by soap or feel. Compare the cold tap with your raw water, meaning the hardness before the softener. Your utility's water report lists it, or an outdoor spigot that skips the softener will show it. If the two read about the same, the softener really has quit. The guide on how to tell if a softener is working covers the before-and-after test. Testing water hardness compares strips, drop kits and lab tests.

Is the bypass valve set to Service?

The bypass valve sits where the house pipes meet the control head, the valve assembly on top of the tall resin tank. In the Bypass position it sends water around the softener, and Fleck's owner's manual describes exactly that: it lets untreated water reach the house while the unit is serviced.

It gets bumped more often than people think. Someone swaps the water heater, a technician squeezes past to reach the furnace, or the valve was turned for a repair and never turned back. Check which style you have:

• Two handles or a single lever on the control head. Follow the arrows or the words stamped on the valve body and set it to Service.
• A push-pull plunger. Push it fully toward the side marked Service.
• Three ball valves on copper pipe. The inlet and outlet valves must be open, with their handles in line with the pipe. The middle valve, which links the two pipes, must be closed. Even slightly open, it blends hard water into every tap.

The bypass valve guide shows each style in all three positions.

Is there loose salt above the water line?

Fleck's own troubleshooting table gives one first fix for water that doesn't feel soft: make sure the salt level is above the water level in the brine tank. During regeneration, the softener's cleaning cycle, the valve pulls salty water from that tank and flushes it through the resin. With no salt left above the water line, it pulls weak brine, and the resin goes back into service still loaded with hardness.

Keep the brine tank a quarter to half full of salt and check it once a month. Most households go through roughly 40 to 80 pounds a month. If you found it empty, refill it, give the water a few hours to turn into strong brine, then start a manual regeneration. A tank that empties much faster than that is a separate problem, covered in softener regenerates too often.

A full tank can still be the problem. You lift the lid, see a heap of white pellets and relax, yet underneath sits a salt bridge. GE Appliances describes it as a layer of salt fused into a crust, with salt water and empty space underneath. The pellets on top never touch the water, so no brine forms.

Push a broom handle straight down through the salt toward the bottom of the tank. If it stops on a hard layer partway down, or punches through into a hollow, you've found a bridge. Break it up and follow the salt bridge guide, which also covers the soft sludge called salt mush.

Is the display on, and is the clock right?

A blank display means no power reaches the control head. Check that the plug-in transformer is seated. Then look for a tripped GFCI outlet, the kind with Test and Reset buttons. It may sit in a garage or bathroom on the same circuit.

If the display is on, check the time of day, including AM and PM. Most softeners regenerate around 2 a.m., and a clock running 12 hours off moves that cycle into the middle of your day. The Fleck SXT manual says the settings survive a power outage indefinitely. Still, an outage can push regeneration back about a day, and a cycle cut off by the outage waits until power returns. The checklist for a softener after a power outage walks through it.

Then open a cold tap and watch the display. On a metered valve, a flow icon or a falling gallon count should react while water runs. If nothing moves, the meter isn't counting, so the softener never knows it's time to regenerate (softener not counting water). If the display shows an error code instead, look it up for your brand: Fleck 5600SXT, Culligan, EcoWater and Morton, or Whirlpool and GE.

Bypass, salt and power all check out: what the softener is telling you

Match what you see to one of these, then jump to the cause.

The salt level hasn't dropped in weeks

The softener isn't regenerating, or it runs the cycle but can't pull brine.

Water stands high in the brine tank, above the salt

The brine draw failed, usually a clogged injector, an air leak in the brine line or a stuck float.

Salt goes down, but the water is hard all the time

Hard water is slipping past the resin: worn seals inside the control head, a leaking bypass valve, or worn-out resin.

Soft in the morning, hard by evening

The resin runs out of capacity before the next regeneration.

It worked for years, then slowly got worse

Aging or fouled resin, or iron coating the beads.

Hard since the day it was installed

An installation fault: plumbing reversed, or the riser tube, the center tube in the resin tank, not seated.

Hard at the hot taps only

The water heater is still full of old water. Give it a few days of normal use.

Salt never goes down: is it regenerating and pulling brine?

First find out whether the softener regenerates at all. Start a manual regeneration (most valves have a button you hold for a few seconds, and how to manually regenerate lists the common ones). Within a few minutes you should hear water rushing to the drain. If the display changes but nothing moves or drains, the motor that turns the valve may have failed (water softener drive motor).

If it runs, watch the brine tank. On most valves, after the first stage, called backwash, the valve switches to brine draw and starts sucking water out of the brine tank. Over the next several minutes the water level inside should fall slowly. Many valves let you step from one stage to the next by pressing the regeneration button again, and your manual shows how.

If the level stays put, or rises, the softener isn't pulling brine. Three things usually cause it:

• A clogged injector. This is the small nozzle inside the control head that creates the suction, with a fine screen in front of it. Grit or salt residue plugs it. The injector cleaning guide shows how to release the pressure, take it out and clear it.
• An air leak in the brine line, the small tube between the brine tank and the control head. A loose or cracked fitting sucks air instead of brine. Tighten it by hand or replace the fitting.
• A blocked or kinked drain line. The injector needs water flowing freely to the drain to create suction. A hose pinched behind the softener can stop the brine draw completely.
• A stuck float. The float in the brine tank shuts off the refill and, on many units, the brine draw too. Stuck in the wrong position, it upsets both (brine tank float).

A failed brine draw also leaves the brine tank full of water, because the refill adds water that never got used. If that's what you're looking at, brine tank full of water separates normal levels from a real overfill. Softener not using salt covers the slower version of the same fault.

Hard all the time while the salt still goes down: water slipping past

When the softener uses salt normally but every tap stays hard, the resin may be fine and the water is simply going around it. Inside the control head, a piston slides through a stack of rubber seals to switch between stages. Worn seals let untreated water leak straight through to the house, and the fix is a seal kit or rebuild (valve rebuild guide).

The bypass valve can leak the same way. Its o-rings harden with age, and hard water seeps across even with the handle in Service. If the valve body is cracked or the o-rings won't seal, replace it (bypass valve replacement). If neither is the cause, the resin itself may be exhausted, covered in the section on worn resin.

Salt goes down but the water stays hard: check the settings

The softener only knows your water through the hardness number you entered. Set it too low and the resin runs out before the next regeneration. The breakfast glasses come out of the dishwasher spotless, yet the after-dinner load comes out spotted. The house turns hard partway through each cycle.

Test your raw water, from a tap before the softener or with the valve in Bypass, and compare the result with the setting. If you used Bypass, turn the valve back to Service afterward. Utility reports often give hardness in mg/L or ppm. Divide by 17.1 to get grains per gallon, the unit most valves use (the ppm-to-gpg converter does it for you). The USGS counts anything over 180 mg/L as very hard. Some city supplies switch sources during the year, so last year's number may be off. With iron in the water, add about 3 to 5 grains per gallon for each 1 ppm of clear-water iron (hardness setting guide).

The button steps differ by valve: see the guides for the Fleck 5600SXT and the Clack WS1.

Softened for years, then slowly gave up: worn or fouled resin

Resin, the bed of small plastic beads that actually removes the hardness, doesn't last forever. It typically lasts about 10 to 15 years on chlorinated city water and longer on clean well water. Chlorine breaks the beads down over time, and iron coats them so they hold less hardness.

The decline is gradual. Water that used to stay soft all week starts turning hard a day or two before each regeneration, a pattern called hardness creep. Amber beads in faucet screens or the toilet tank point to a broken part inside the tank instead (resin beads in your water). Water that tastes salty after a regeneration is a rinse problem with its own guide (salty water after a softener). Worn resin can also slow the water down, covered in low pressure after a softener.

Iron-fouled resin can sometimes be cleaned with a resin cleaner. Resin that is simply old gets replaced, which is a manageable job on most tank-style units (replacing softener resin). On a unit past 15 years with other problems, weigh it against repair or replace.

Hard water since the day it was installed

A new softener that never once produced soft water usually has an installation problem. Before you call anyone, rule out the simple one: the bypass valve was left in Bypass, or the hardness was never set and still sits at the factory default. Then look at two mechanical faults:

1. Inlet and outlet reversed. The control head is marked with IN and OUT, or with arrows, where the pipes connect. If the house supply runs into the OUT port, water flows through the tank the wrong way. It won't soften properly, and resin beads can end up in your plumbing.
2. A loose or short riser tube. The riser tube is the plastic tube down the center of the resin tank that carries soft water up from the bottom. It may have been cut too short, or slipped out of its o-ring when the control head went on. Either way, water takes a shortcut from inlet to outlet without passing through the resin.

It's an easy mistake on a self-installed unit, because the head has to go on straight while the riser tube slides into its o-ring. Fixing it means taking the control head off the tank. The installation guide shows how the riser and the o-rings should seat.