Limescale in a Thermador Dishwasher: Reading E12 and E2060

Hard water leaves a mark

Thermador lists limescale buildup in the heat pump as the reason for E12 and E2060. Minerals in the water gradually coat the heating surfaces, and eventually the dishwasher stops a cycle rather than run with a coated pump. In other words, the cause is the water, not a sudden electronics failure.

Thermador’s recommended first step

1. Choose a proper dishwasher descaling product.
2. Run it through a cycle as the product directions say.
3. If your model uses water-softening salt, add it and keep the reservoir topped up.
4. Start a normal cycle afterward and watch for the code.

Household vinegar is not a substitute for a made-for-purpose product, so stick with the label directions.

Keeping it from coming back

Scale returns wherever the water is hard, so regular descaling is the maintenance that matters most. Wiping the door seal and clearing the filter at the same time keeps the rest of the cycle healthy.

When the code returns anyway

If the code shows up again soon after a thorough descaling cycle, the buildup has reached a level that needs a technician, not another attempt at home. When you book, mention how hard your local water tends to be. That detail tells us how frequently this kind of upkeep is likely to be needed. Our code pages for E12 and E2060 list the checks we make, and our dishwasher repair page shows what else we service.

If you have never descaled the machine, tell us when you book. A dishwasher that has gone years without it often needs more than one pass, and knowing that ahead of time lets us plan the visit properly.

We give a written price before any work and cover repairs with a 30-day workmanship warranty.