Water feels hard again, or soap won’t lather
The softener has stopped removing hardness. The usual causes, most likely first: the salt has run out, a salt bridge has formed, the bypass valve was left open, the hardness setting is wrong, or the resin is worn out.
Try firstCheck the salt and the bypass valve (steps 1 to 3 below).
The salt level isn’t going down
If the salt stays level for weeks, the softener isn’t drawing brine. Either a hard crust (a salt bridge) is sitting above the water, or the unit has stopped regenerating because of a timer, power or valve fault.
Try firstPush a broom handle gently down through the salt to feel for a crust.
The brine tank is full of water
A few inches of water in the brine tank is normal. A tank that’s filling up means the brine can’t be drawn out: a blocked brine line or injector, a stuck float, or a kinked or clogged drain line.
Try firstCheck that the drain line isn’t kinked, then run a manual regeneration.
Stuck in regeneration, or regenerating constantly
If water keeps running to the drain, the control valve isn’t completing its cycle. The cause is usually a worn piston or seals, a failing drive motor, or a timer or circuit-board fault.
Try firstPut the softener in bypass to stop the water loss, then call.
Rotten-egg or sulfur smell
A sulfur smell usually comes from hydrogen sulfide in well water, or from bacteria in the resin or brine tank. A softener doesn’t remove hydrogen sulfide. That needs different treatment.
Try firstNote whether it’s hot water only or all taps, and tell the technician.
Low water pressure after the softener
Pressure that drops after the softener points to resin fouled with iron or sediment, a clogged pre-filter, or resin beads broken down into fine particles that pack the tank.
Try firstPut the softener in bypass. If pressure recovers, the softener is the cause.
Resin beads in your water
Small amber beads in faucet aerators or the toilet tank mean resin is escaping the tank. The distributor tube or the screen at the bottom of the tank has cracked.
Try firstThis isn’t a DIY fix. Call for a repair.
Leaking around the valve or tanks
Leaks usually come from worn O-rings at the control valve, loose bypass or plumbing connections, or, rarely, a cracked tank. A leak under line pressure gets worse, not better.
Try firstPut the unit in bypass and shut off the supply if you can.