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Maintenance & Prevention

Changing a Thermador Water Filter — and Making the Symbol Stop Flashing

Fit the new filter and rotate it fully home so the lines on the cap align with the lines on the compartment, then hold LIGHT / FILTER — or SUPER COOL on some models — together with ICE for three seconds. The symbol stops flashing and the counter restarts. Run several glasses through to purge trapped air before judging the water.

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The full guide

Maintenance & Prevention By Appliance Content Team Last checked 3 minute read

The three-second answer

If your filter is new and the symbol is still flashing, you are looking for this:

Hold LIGHT / FILTER — or SUPER COOL on some models — together with ICE, for three seconds.

The symbol stops and the counter restarts. Nothing is wrong with the appliance or with the filter.

Three things that go wrong after a filter change Air in the line gives small or hollow cubes, or none, and clears once enough water has been drawn off. A cartridge not fully seated lets water bypass the filter and on some designs the interlock does not open at all. The wrong filter is the one that catches people, because plenty of aftermarket cartridges fit the housing without meeting the flow the ice maker needs. IT WAS FINE UNTIL I CHANGED THE FILTER — ALMOST ALWAYS ONE OF THESE. 1 · AIR IN THE LINE Small cubes, hollow cubes, or none. Draw off more water. Time does the rest. 2 · NOT FULLY SEATED Water bypasses it, or nothing comes at all. Take it out and seat it again, deliberately. 3 · THE WRONG FILTER It fits the housing. That is not the test. Flow is, and an ice maker needs all of it. The indicator is a timer, not a measurement — it counts months, not what has gone through.
Two of the three fix themselves within a day. The third fits perfectly and never will, which is why it is worth knowing the part number before the cartridge arrives.

Why it needs doing at all

The reminder is a counter, not a measurement. It tracks time and volume; it does not sense what is in the water and it has no way of knowing you have fitted a new cartridge. So on many models it keeps flashing until it is told — which is why so many people conclude their new filter is faulty and buy another one.

Where the filters are

The water filter and the air cartridge compared Two separate filters. The water filter treats the water going to the dispenser and the ice maker and is changed about every six months. The air purification cartridge treats the air inside the refrigerator compartment, reducing odors and ethylene gas, and is changed about every twelve months. Each has its own reminder, and each must be reset by hand. TWO FILTERS. NEITHER ONE AFFECTS THE OTHER. WATER FILTER Treats the water going to the dispenser and to the ice maker Change about every 6 months Flush 2–3 gallons through afterward, or the first water looks wrong. AIR PURIFICATION CARTRIDGE Treats the air inside the compartment — odors, and the gas fruit gives off Change about every 12 months You cannot see it working, which is why it is the one people forget.
Both reminders are timers. They count elapsed time, they do not test anything, and neither clears itself when a new filter goes in — which is most of the "I changed it and the light is still on" calls.

The water filter sits inside the cabinet on a column, in its own compartment. It comes out with a quarter turn and the new one goes in the same way.

Seating is the step that gets missed. Rotate it fully home so the lines on the cap line up with the lines on the compartment. A filter left half-turned restricts flow, and restricted flow looks exactly like a failing dispenser or an ice maker that has given up.

The odor filter is a separate carbon cartridge for the air inside the cabinet. It is what stops last night's fish scenting the butter, it is replaced far less often, and most owners have never touched one. If your refrigerator smells despite being clean, that is the part to look at.

The whole job, in order

  1. Turn off the water at the shut-off valve if you would rather be careful. On most of these you do not need to, but a filter head that has been in place for years can drip.
  2. Remove the old cartridge with a quarter turn.
  3. Fit the new one and rotate it fully home, lines aligned.
  4. Reset the reminder — the three seconds above.
  5. Purge. Run several glasses through the dispenser. The first ones may be cloudy with trapped air, which is normal and clears.
  6. Check the ice. The first batch after a filter change is worth discarding.

If the ice maker stops after a filter change, that sequence is why. A cartridge not fully seated or a reminder never reset are the two commonest causes of "it worked until I changed the filter" — both free to fix, and both mistaken for a repair every week.

How often, on this water

About every six months. Miami-Dade water is hard, and there is no case for stretching the interval here — the manufacturer's own figure is written for the country as a whole and this end of it is harder than average.

If flow drops noticeably well before six months, the filter is reporting something about the supply: pressure, sediment, or a shut-off valve that is not fully open. That is worth chasing rather than solving with a fresh cartridge every eight weeks.

When it is not the filter

  • No water at all — start at the shut-off valve under the sink and the line behind the appliance
  • Slow water with a new, correctly seated filter — house pressure, or a kinked line
  • Water fine, ice poor — an ice-maker question rather than a filter one
  • Water tasting stale after a period away — run several liters through before judging it

The full dispenser and filter symptom page works down the list in order, cheapest first.

Worth doing at the same time

Since you are already inside the cabinet with a cloth in your hand: wipe the door seal folds dry, and look at whether the drip channel at the back is clear. Both take two minutes, and both prevent the calls we would otherwise be taking from you in six months.

If it turns out to be a repair

Every job on this site is priced the same way: an on-site diagnostic first, the figure agreed in writing before anybody starts.

  • A hand holding a glass under the water dispenser recess of a built-in refrigerator
    Often a three-second fix

    Water dispenser or filter symbol

    Little or no water at the dispenser, or a filter symbol that keeps flashing after you have already changed the filter. The second one is a reset rather than a repair.

    • Water slow or not dispensing
    • Filter symbol flashing after a change
    • Water tasting of nothing in particular
    What it usually means
  • A gloved hand with a sponge cleaning the shelf brackets inside an empty refrigerator
    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
    What this involves
  • A refrigerator standing open, both sides stocked with produce, dairy and cold cuts
    Freedom columns · French door · Under-counter

    Built-in refrigerators & columns

    A Freedom column is one cabinet holding one temperature — all refrigerator, no freezer in it — usually installed beside a freezer column as a matched pair behind panels that look like joinery. That makes the diagnosis cleaner and the access harder.

    • Not holding temperature
    • Frost or condensation inside the cabinet
    • A door that no longer seals against its panel
    Refrigerator repair
  • Ice cubes filling the bin below two ice trays inside a freezer
    Inside the freezer column

    Ice makers

    There is no standalone ice machine on this brand. The ice maker is a module inside a freezer column, fed by a water line run through the cabinetry — so this page is about that module and the water reaching it, not about an undercounter machine behind a bar.

    • No ice at all, in a freezer that is holding temperature
    • Hollow, small or cloudy cubes from a full mold
    • Ice that has taken on a taste or a smell
    Ice maker repair

Questions people ask about this

I changed the filter and the symbol is still flashing.

That is the reminder rather than the filter. It is a counter, not a measurement, and on many models it has to be reset by hand: hold LIGHT / FILTER, or SUPER COOL, together with ICE for three seconds.

How often should it be changed here?

About every six months is the usual guidance, and Miami-Dade water gives no reason to stretch it. If your water slows noticeably before six months, the filter is telling you something about the supply rather than about itself.

Does a third-party filter work?

Sometimes, and the failure mode is the reason we would not: filters that do not seat quite right restrict flow, and the symptoms are exactly those of a failing dispenser or a dying ice maker. It is the cheapest part of the appliance to be certain about.

The water is cloudy after the change.

Trapped air, and it is expected. Run several glasses through and it clears. Cloudy water that persists past a few liters is worth mentioning.

What is the odor filter?

A carbon filter for the air inside the cabinet rather than the water — it is what keeps strong-smelling food from scenting everything else. It is replaced far less often than the water filter and almost nobody knows it exists.

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Tell us the model number and what it is doing.

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This article is based on:

  • Official manufacturer documentation
  • Internal repair procedures
  • Technician repair history
  • Company quality standards
Call (305) 846-7685