Match the symptom, then work through the safe checks.
1. What best matches what you observe?
2. Complete only the checks that are safe for you.
Show stop conditions
- Burning smell, smoke, or excessive heat
- Breaker trips repeatedly
- Heater wiring must be tested
Likely causes
- Heater is not reaching expected temperature
- Temperature sensor is inaccurate
- Scale or poor water flow affects heating
- Heater relay, wiring, or control is faulty
Quick checks, in order
Record the cycle stage
Note whether the code appears during washing or drying.
Check supply temperature
Confirm installation meets the manual.
Use approved descaling only
Do not mix cleaning chemicals.
Stop before electrical heater tests
Resistance and voltage tests need qualified service.
What happens when E31 appears?
Heater, sensor, relay, or power path may be faulty.
Disconnect power and stop using it.
Focus on drying heat, airflow, fan, or temperature sensing.
Stop and get qualified help when
- Burning smell, smoke, or excessive heat
- Breaker trips repeatedly
- Heater wiring must be tested
Official support and model manuals
Use the full model number from the rating label. The manufacturer manual is the deciding reference when codes differ by region or product family.
Frequently asked questions
What does E31 mean on a Bosch dishwasher?
On many model families, E31 indicates that the drying system is abnormal. Confirm the exact model and region because the same display can be used differently.
Can I clear E31 by unplugging the dishwasher?
A short power reset may clear a temporary state, but it will not fix a blocked hose, leak, failed sensor, motor, heater, or wiring fault. Stop if the code returns.
Should I replace a part based only on the code?
No. A code identifies a system or condition, not always the failed component. Complete safe external checks and use the model-specific manual or qualified service.