Kenmore Water Softener: Fix Hard Water Issues

Quick Answer

The most common reason a Kenmore softener stops working is a salt bridge. Use a broom handle to break up any hard crust in the salt tank. If the salt is loose, clean the nozzle and venturi assembly, as a tiny clog there will stop the system from softening your water.

In 15 years of fixing these things, Kenmore softeners are honestly some of the toughest machines I work on. When they stop softening, it's almost always a physical flow problem, not a circuit board failure. But don't just ignore it. A softener stuck in bypass will let hard water hammer your water heater and leave white scale crusted all over your dishwasher. Most of these fixes cost nothing except your time.

KenmoreWaterheaterSeverity: moderateDifficulty: easy90% DIY Success

Time to Fix

20–45 min

Difficulty

easy

Parts Cost

$12 – $110

Tools Needed

Broom handle or long wooden dowel, Needle-nose pliers

Kenmore Water Softener: Fix Hard Water Issues

Here's the deal: most Kenmore softener problems are a cleaning job, not a parts job. Before you call anyone, check for a salt bridge and clean that venturi assembly. I've seen those two things solve about 80% of the hard water calls I get. Salt's cheap, a toothpick's free, and you can probably knock this out in under an hour.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Salt bridge forming a hard crust above the water level50%

Clogged nozzle and venturi assembly25%

Stuck brine tank float assembly10%

Worn rotor disc or seal10%

Failed drive motor5%

Symptoms You May Notice

Your soap doesn't lather the way it used to, and the water feels filmy or hard on your skin in the shower.
The salt level in the tank hasn't dropped at all in two or three weeks, even though you've been running the dishwasher and doing laundry every single day.
There's a solid hard crust on top of the salt that you can practically stand on, with a hollow gap underneath where the water should be dissolving it.
The brine tank is completely full of standing water after a regeneration cycle, which means something's blocking the venturi from drawing it back out.
Your dishwasher glasses are coming out with white mineral spots again even though the softener's plugged in and the display looks totally normal.

Can you reset a Kenmore waterheater to clear the NOT-SOFTENING code?

To reset the control board, unplug the power transformer from the wall outlet for at least 60 seconds. Plug it back in and the board will run a self-test. If an error code persists, you likely have a mechanical failure that the board is detecting during its startup sequence.

Tools Required for Diagnosis

Broom handle or long wooden dowelNeedle-nose pliersPhillips #2 screwdriverToothpick or thin wireFlashlight1-gallon bucket or largerWater hardness test strips

Service / Diagnostic Mode

Press and hold the Select button for three seconds until the display changes to show the software version. Use the Select button to scroll through the sensor data and motor position tests.

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Did the fix not work?

If the problem comes back after following these steps, a component has permanently failed and needs replacement. Check the specific error code your waterheater is showing:

Err 1 Error →Err 3 Error →

ComponentComponent Under Test

Expected Range5–50 ohms

ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Nozzle and Venturi Kit7114533 · $15–$30	7114533	$15 – $30
Rotor Position Switch7030713 · $12–$25	7030713	$12 – $25
Drive Motor7286039 · $60–$110	7286039	$60 – $110

Frequently Asked Questions

How much salt should be in my Kenmore softener?

Keep the salt between the 1/3 and 2/3 full marks on the side of the tank. Honestly don't fill it to the very top. The weight of a completely full tank actually increases your chances of getting a bridge, especially in humid basements. I tell my customers to fill it halfway and just check it every few weeks. You'll probably use about one 40-pound bag per month depending on your water hardness and how big your household is.

Why is my Kenmore water softener tank full of water?

A brine tank full of standing water after a regeneration almost always means the venturi is clogged and can't suck the water back out, or the drain line is kinked somewhere behind the unit. Clean the nozzle and venturi first, that fixes it probably 70% of the time. If the tank's still full after that, check the float assembly because a stuck float can also cause overfilling. Worst case, the rotor seals are worn and the valve isn't advancing to the brine draw position properly.

Does my Kenmore water softener need a resin cleaner?

If you've got any iron in your water at all, yeah, use a resin cleaner. Iron builds up on the resin beads and cuts their efficiency way down over time. You can grab a bottle of liquid resin cleaner at any hardware store, pour it right down the brine well, and run a manual regen cycle. I'd do it every 3 months if your water has noticeable iron, every 6 months otherwise. It's basically like an oil change for your softener.

What does Error Code 1 mean on a Kenmore softener?

Error 1 means the board sent a signal to the motor but didn't get confirmation back that the valve moved where it was supposed to go. Before you buy a motor, check the wire harness between the motor and the board. I've fixed a bunch of these just by reseating a connector that vibrated loose over time. If the wiring's good and seated tight, then yeah, the motor's probably seized and needs to come out.

How do I know if my Kenmore softener resin needs to be replaced?

Resin doesn't usually need replacing for 10 to 15 years if you're maintaining the system. But if you've cleaned everything, the venturi's clear, the motor runs fine, and the water's still coming out hard, run a manual regen and then test the hardness right at the softener outlet with a test strip. If it's still hard, the resin beads might be exhausted or iron-fouled beyond what a cleaner can fix. Resin replacement for a Kenmore runs about $50 to $80 for the media and it's a doable DIY if you're comfortable draining the tank.

Related Kenmore Waterheater Error Codes

Code: Err 1Kenmore Softener Error 1: Motor Position Fault Code: Err 3Kenmore Softener Error 3: Control Board Logic Error

Same Fix on Other Brands

Whirlpool waterheaterNOT-SOFTENING: Whirlpool Water Softener Troubleshooting Morton waterheaterNOT-SOFTENING: Morton Water Softener Troubleshooting

Models Known to Experience NOT-SOFTENING Errors

This repair applies to most Kenmore waterheaters with this error code. Common model numbers include:

625.38300, 625.38350, 625.38420, 625.38520, 625.38845, 625.38885

Written by

Raj Patel

HVAC & Water Systems Specialist · 15 years experience

Last verified for technical accuracy on May 20, 2024