Thermador Dishwasher SA NL: Salt and Rinse Aid Refill
Quick Answer
SA and NL are not error codes on Thermador dishwashers - they are consumable refill indicators. SA stands for the water softener regenerating salt reservoir, and NL indicates the rinse aid dispenser is low. When both appear simultaneously, it simply means both need to be topped up.
Look, nine out of ten calls I get about this, the homeowner is convinced their $1,500 dishwasher is broken. It's not. SA and NL are just your machine asking you to feed it. Ignore them long enough and you'll start getting spotty glasses, and if you skip the salt for months in a hard water area, limescale starts coating the heating element. That repair costs real money.
ThermadorDishwasherSeverity: low99% DIY Success
Time to Fix
3–10 min
Difficulty
beginner
Parts Cost
—
Tools Needed
Wide-mouth funnel (for pouring salt without spilling), Bag of dishwasher-grade regenerating salt, coarse pellet type (Finish, Somat, or Morton dishwasher salt)
What Does the SA-NL Code Mean?
OK so here's the deal. SA is salt, NL is rinse aid. That's it. Thermador uses a European-style built-in water softener, which is honestly one of the reasons these machines clean so well, but it only works if you keep coarse regenerating salt in the reservoir. The fix costs maybe $10 and ten minutes. Pretty much the easiest maintenance call there is.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Salt reservoir depleted through regular water softening cycles40%
Both consumables running out at the same time after heavy use36%
Rinse aid dispenser emptied through normal use24%
Symptoms You May Notice
SA and NL both showing on the control panel at the same time, either steady or blinking depending on your specific model
Dishes coming out with white haze or water spots, especially on glassware and dark plastic items, which means the rinse aid has been empty for at least a few cycles already
Machine completes a full wash cycle without any problems but shows the indicators again when you open the door afterward
Faint cloudy mineral film starting to build up on the interior stainless walls on older units that have been running salt-free for a while
Can you reset a Thermador dishwasher to clear the SA-NL code?
No button sequence needed here. SA and NL clear automatically once the sensors detect refilled levels during a wash cycle. Fill both, make sure the salt cap is fully tightened and the rinse aid dispenser cap is sealed, then run a normal or quick wash. Give it one full cycle. If an indicator is still on after that, run a second cycle and it'll clear.
Tools Required for Diagnosis
Wide-mouth funnel (for pouring salt without spilling)Bag of dishwasher-grade regenerating salt, coarse pellet type (Finish, Somat, or Morton dishwasher salt)Bottle of liquid rinse aid (Finish Jet-Dry or equivalent)Damp cloth (to wipe up any rinse aid spills on the door panel)
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
Frequently Asked Questions
What does SA mean on a Thermador dishwasher?
SA stands for salt. Specifically, it's telling you the water softener salt reservoir in the bottom of the tub is low or empty. Thermador dishwashers use a built-in water softener, which is actually why they clean so well, but that softener needs coarse regenerating salt to function. Grab a bag from any grocery or hardware store, fill the reservoir on the tub floor, run a cycle, and you're good. Plan on refilling it every four to eight weeks depending on how often you run the machine and how hard your water is.
What does NL mean on a Thermador dishwasher?
NL is the rinse aid indicator. It means the dispenser on the inside of the door is empty and needs a refill. Rinse aid is what makes dishes actually dry spot-free instead of coming out wet and streaky. It breaks the surface tension of the water so it sheets off the dishes instead of forming droplets that leave marks. Fill the dispenser with liquid rinse aid, Jet-Dry is the most common brand, snap the cap on, and run a cycle. The NL light turns off on its own.
Can I run the Thermador dishwasher without salt?
Short answer: yeah, technically. But you probably shouldn't. If you're in a soft water area, under 6 grains per gallon, you can get away with it for a while. But in hard water, which is most of the country, skipping salt means the softener resin bed stops doing its job. Over weeks and months, limescale starts coating the heating element, clogging the spray arm holes, and building up inside the tub. I've seen machines with heating elements completely encrusted because someone ran them salt-free for a year. Just keep it filled, it's a five-minute job.
Why are SA and NL showing at the same time?
Just a coincidence of timing, basically. Both consumables have separate sensors and they fire their indicators independently. But since they both deplete through normal use, they often hit empty around the same time, especially after a stretch of heavy use. It's not a fault code, nothing's broken, it's not a cascade issue. Think of it like your car hitting low on gas and washer fluid at the same time. Two unrelated things, same timing. Just top up both and you're done.
The SA light is still on after I refilled the salt. What's wrong?
Check the cap first. Most of the time when this happens, the cap isn't fully tightened and the sensor isn't reading correctly. Unscrew it, reseat it, make sure it's snug, and run a full wash cycle. The salt sensor doesn't just look at the level directly, it detects a water conductivity change after the softener completes a regeneration pass, so it actually needs a full cycle to update. If you've run two full cycles and the light is still on, try pouring a cup of warm water directly into the salt reservoir before screwing the cap back on. Sometimes there's an air pocket that throws off the sensor.
How often do I need to refill the salt and rinse aid?
Depends on your water hardness and how much you run the machine. In a house with hard water running the dishwasher daily, I'd say salt every four to six weeks and rinse aid every three to four weeks. Soft water areas, salt can stretch to two months easy. Most Thermador models let you set the water softener hardness level in the settings menu. If you dial it to match your actual water hardness it'll optimize salt usage per cycle and stretch your refill intervals. Check your local water utility's annual report for your hardness number, they're almost always available online.