Bosch Dishwasher E12 Error Code

If your Bosch dishwasher is displaying E12, this guide explains what it means,
what you can safely check, and when professional diagnosis may be needed.

What does E12 mean on a Bosch dishwasher?

Limescale buildup in the heat pump.

Definitions can vary by model or platform, so compare the code with information for your exact model before replacing parts.

What you can try

Descale the dishwasher using a dishwasher-safe descaler and use softening salt if the model has a water softener.

Before booking a repair

1. Confirm the displayed error code and your appliance model number.
2. Check relevant external issues such as a blocked filter, kinked hose, open door, interrupted power, or restricted airflow.
3. If a power reset is appropriate for the appliance, turn it off safely and restart it once.
4. If the code returns, avoid repeated resets and arrange diagnosis.

Safety note

Disconnect electrical power before accessing internal components.
Do not open sealed, gas, high-voltage, or refrigerant systems unless qualified to service them.
These steps are general guidance and do not replace service information for your exact model.

Still seeing E12?

If the problem persists, contact Appliance Maestro to diagnose and repair your Bosch dishwasher.

Contact Us

When should you call a technician?

If the E12 code returns after the safe checks above, or the appliance is leaking, overheating,
tripping a breaker, making unusual noises, or not operating correctly, professional diagnosis is recommended.
Appliance Maestro provides appliance repair service in Ottawa and surrounding communities.

Related Bosch dishwasher error codes

Bosch Dishwasher E07Bosch Dishwasher E10Bosch Dishwasher E15Bosch Dishwasher E01Bosch Dishwasher E02 / E03Bosch Dishwasher E05