Bosch Dishwasher E09 Error Code

What this error means

E09 indicates a heat pump internal heater fault on Bosch 800 Series and Benchmark dishwashers with CrystalDry or Zeolite drying. Sanitize and heavy cycles abort when wash water or dry air cannot reach target temperature.

Common causes

• Scale buildup on the flow-through heater passage
• Open heating element in the heat pump module
• Heat pump refrigerant circuit fault on sealed systems
• Control board not commanding heat after prior E12 limescale event

Step-by-step fixes

1. 1Run hot water at the kitchen sink thirty seconds before starting a cycle
2. 2Reset breaker thirty seconds per Bosch guidance
3. 3Use Bosch descaler on an empty hot cycle if E12 appeared recently
4. 4Retry on Normal without Sanitize to see if E09 is heat-pump specific

Affected models

• Bosch SHPM65Z55N
• Bosch SHX878ZD5N
• Bosch SHEM78WH5N