Maintenance & Prevention
Cleaning a Thermador Dishwasher Filter, and Descaling for Miami Water
Twist the filter assembly counter-clockwise, lift it out, and rinse it under the faucet with a soft brush; do it monthly if the machine runs most days. Descale separately with a purpose-made dishwasher descaler on an empty hot cycle, two to four times a year on Miami-Dade water — and set the machine's water hardness correctly, which most people never do.
The full guide
The filter, in two minutes
At the bottom of the tub there is a cylindrical filter in a flat mesh plate.
- Twist the cylinder counter-clockwise and lift it out. No tools.
- Lift out the flat plate underneath it.
- Rinse both under the faucet with a soft brush. Look at what comes off — seeds, labels, grease — because that is what has been recirculating over your dishes.
- Refit and turn the cylinder until it locks. It should not spin freely afterwards.
While the plate is out, look into the sump. A drain pump cover sits alongside it; anything obvious in there comes out by hand.
This is the answer more often than the pump. A blocked filter stops water leaving and stops dishes getting clean, and both of those are jobs people book visits for. The full drain symptom page works through the rest of the path — hose, high loop, air gap, and a disposal knockout plug that was never punched out.
Descaling, which is a separate job
Miami-Dade water is hard. This platform takes that seriously enough to publish a code for limescale in the heat pump — the machine tells you when the water has been doing what the water here does.
Use a purpose-made dishwasher descaler, on an empty machine, on the hottest cycle it has. Follow the product rather than the internet: dosing matters and more is not better.
Two to four times a year on this water, on a machine used most days.
Not vinegar. It is acidic enough to work on seals and stainless over months, and you will be doing this regularly. It is a poor trade for a job a proper product does better.
The setting almost nobody sets
These machines have a water hardness setting that controls how much softening salt they use. It is meant to be set at installation against the local supply, and on a great many machines in this city it was never set at all.
The symptoms of leaving it wrong are not dramatic and they are constant: filmed glassware, detergent that seems weaker than it should be, and scale building faster than it needs to. Setting it — and keeping salt in the reservoir — changes the result more than any single part on this page.
Why scale is worth taking seriously on this brand
On most dishwashers, scale means a slow decline in performance. On the models with a mineral drying chamber it eventually reaches an assembly that is the most expensive dishwasher repair on this site.
That is the actual argument for a $155 maintenance habit: not tidiness, but the row further down the price list that it prevents.
The monthly rhythm that keeps a machine out of trouble
- Filter: monthly, two minutes
- Spray arms: spin them by hand, hold them to the light, clear the jets with a pin
- Door seal: wipe the folds, particularly the bottom corners
- Rinse aid and salt: top both up
- Descaler: quarterly on this water
That is fifteen minutes, four times a year, and it is most of what we would do on a maintenance visit for the dishwasher. What a maintenance visit covers across the kitchen if you would rather have all of it done at once.
If it turns out to be a repair
What this leads to, and what it costs
Every job on this site is priced the same way: an on-site diagnostic first, the figure agreed in writing before anybody starts.
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Often the water, not the machine Dishwasher not cleaning properly
Grit left on plates, a film on glasses, or detergent still sitting in the cup at the end. On hard water most of this is chemistry and loading before it is ever a part.
- Grit or food left on the lower rack
- A cloudy film on glassware
- Detergent still in the dispenser afterwards
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The most common call Dishwasher not draining
Water standing in the bottom of the tub after a cycle. Two of the five causes come out by hand without tools, which makes this the symptom most worth five minutes before booking anything.
- Standing water after every cycle
- A code in the twenties, or an E61 label
- Dishes clean on top, wet and gritty below
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from $155 Descaling and maintenance
South Florida water is hard, and this platform publishes a code for scale in the heat pump. Descaling, filter changes and the checks that keep a $155 service from becoming a $245 assembly.
- E12 and E2060 — scale, published as a condition
- Water and air filters changed and registered
- Condenser and hood filters cleaned properly
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Masterpiece · Star-Sapphire · Crystal Dry Dishwashers
Quiet, panel-ready, and dried by a mineral chamber rather than a heating element. Two of the commonest complaints about these machines are the design working exactly as intended; the third is a filter nobody has taken out in a year.
- Water standing in the tub after a cycle
- Plastics coming out wet
- The leak protection tripping and the machine refusing to run
Questions people ask about this
How often does the filter need cleaning?
Monthly on a machine that runs most days, and more often if you do not rinse plates first. It takes two minutes and it is the single commonest answer to a machine that has stopped draining well.
Is vinegar safe in the machine?
We would not. It is acidic enough to work on seals and stainless over time, and a purpose-made descaler does the job better without the argument. On this water you will be descaling regularly, so it is worth using the right product.
What is the water hardness setting?
A setting that tells the machine how much softening salt to use. It is set once, at installation, and on a great many machines here it was never set at all — which is why glassware films over and detergent underperforms.
There is a code about scale.
This platform publishes one, which is unusual and useful: the machine is telling you the heat pump is scaling up. Descale it and set the hardness. Ignored for long enough, scale reaches the drying chamber, which is the expensive assembly.
Do I still need rinse aid?
Yes, and more here than in a soft-water city. These machines dry by condensation, and rinse aid changes the way water leaves a surface — an empty reservoir shows up as poor drying long before anything is wrong.
Maintenance & Prevention
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Tell us the model number and what it is doing.
This article is based on:
- Official manufacturer documentation
- Internal repair procedures
- Technician repair history
- Company quality standards