FROM THE TROUBLESHOOTING LIBRARY
Bosch Dishwasher E09 Error: Heat-Pump Heater Fault (Also E20)
Short answer: E09 on a Bosch dishwasher means a fault in the heat pump's internal heater. Bosch gives E20 (and the longer E2030 and E6001 codes) the same meaning, so this guide covers both. Reset the breaker for 30 seconds once; if the code returns, stop running heated cycles and book Bosch service.
What E09 means
Bosch lists E09 as a heat-pump internal-heater fault/error. It is a broad appliance diagnosis and can involve the heater, heat-pump assembly or electronics depending on the E-Nr.
Primary reference: Bosch Dishwasher Error Codes.
Safe checks
- Record E09 and the model/E-Nr.
- With no signs of damage, reset the breaker for 30 seconds, which is Bosch's stated first step.
- Run no more than one test cycle. If E09 returns, stop using heated cycles.
- Contact Bosch or a qualified appliance technician. Do not access the heater, pump or wiring.
When to stop
Stop immediately if the dishwasher leaks, smells scorched, trips power or leaves water unexpectedly hot. Heater work is not a live-appliance DIY task.
Parts You Might Need
- Model-specific Bosch heat-pump/heater assembly for a technician-confirmed repair
- Soft microfiber cloth for a dry external check