Error code
Bosch error code E09
Bosch error code E09: the heater inside the heat pump is not behaving as the control expects. What the code covers, what to check first, and what it does not tell you — on dishwashers.
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What we can confirm
Code E09, from the manufacturer's own documentation
A code is only meaningful together with the machine showing it — the same digits mean different things on different equipment.
The code
E09
The heater inside the heat pump is not behaving as the control expects
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What it narrows down to
Heat pump heater
What you are probably seeing
Diagnostic
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What it looks like from the kitchen
The symptom this code usually arrives with
A code names the subsystem; the symptom is what sent you to look at the display in the first place. That page says what it usually turns out to be, cheapest cause first.
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Usually not a repair Dishwasher not drying
Plastics coming out wet is how these machines are designed to behave, and it is the single most common reason somebody books a repair on this brand that they do not need. Glassware coming out wet is a different matter.
- Plastics wet, glass and steel dry
- Everything wet, including glass
- Drying noticeably worse than it used to be
On the same appliance
What else belongs to the dishwashers
On this make a code belongs to the appliance rather than to a product line. These are the other conditions this machine can display, and the models that can show this one — a display often has more than one thing to say, and the model number decides what any of it costs to put right.
Other codes this appliance can display
Heat pump circuit
Board relay
Heating self-test
Wash arm diverter
Door sensor
Drying fan
Mineral chamber heater
Scale build-up
Flow meter
Leak protection
Water not entering
Low water level
The same digits mean different things on different equipment. Search the full code list
In more detail
About Bosch error code E09
What this one means
The heater inside the heat pump is not behaving as the control expects.
The other ways your machine may say it
The same condition is published under more than one label, because it has been carried across generations of this appliance:
- E09, E20, E2030, E6001 — the same condition, on machines of different ages
- Active and Sanitized lights flashing — how a model with no digital display says it. On that machine, the lights are the code
- Clean and Sanitized lights flashing — how a model with no digital display says it. On that machine, the lights are the code
What the code covers
A published cause names a circuit rather than a component, which is the single most useful thing to know before ordering a part. This one covers:
- The heating element inside the pump assembly
- Its sensor
- The circuit driving it
Worth doing before you call
- Cut power at the breaker for thirty seconds
- Check whether the machine has recently shown a scale code — scale is behind a real share of these
Then what
The heat pump combines circulation and heating in one assembly, so this is the expensive end of the machine. Descaling first is worth it if the machine has been asking for it.
This code is published for dishwashers. The full list of codes has the rest.
This article is based on:
- Official manufacturer documentation
- Internal repair procedures
- Technician repair history
- Company quality standards