E09 on a Bosch dishwasher is generally described as a heating circuit fault: the heating element isn’t working, or the control board or power module isn’t switching power to it correctly. Start with a power reset (switch off at the breaker for about 30 seconds). If the code returns, the likely culprits are a burnt-out heating element or a faulty relay on the control board or power module. Testing and replacing those parts is a job for a technician, because the heater runs at line voltage.
Read More: How to Replace Bosch Dishwasher Racks: Parts & Steps
Table of contents
What Does E09 Mean on a Bosch Dishwasher?
Sources agree on the general area, a heating fault, but describe the exact trigger differently.
| Source | What it says E09 means |
| How To Fix It | Heating circuit fault. The heating element or heat pump has failed, so check continuity |
| MyPros | Heating element open circuit or safety relay error. The power module’s relay isn’t switching, or is stuck closed (citing the Bosch Ascenta SHE6AF02UC service manual) |
| EasyBear Appliance Repair | The flow-through heater has stopped producing heat, and the control board flagged it |
| Hoffmann Brothers | A disruption in the water heating system, where the heater isn’t reaching the temperatures needed for cleaning |
What this means: E09 is a heating-related code. Check your owner’s manual or service documentation for your exact model, because the specific cause can vary.
Common Causes of E09
Combining the sources, these are the possibilities:
- Burnt-out heating element. EasyBear ranks this as the most common cause, and How To Fix It lists it first.
- Failed connection to the element, such as loose, frayed, or damaged wiring (EasyBear, Hoffmann Brothers).
- Faulty heater relay on the control board, or a poor solder joint on that relay (How To Fix It, EasyBear).
- Power module relay problem, where it isn’t switching or is stuck closed (MyPros, citing a service manual).
- Faulty temperature sensors or thermal cut-offs sending incorrect signals (Hoffmann Brothers).
- A weak or stuck circulation pump. EasyBear says this can trigger E09 as a secondary fault, because the flow-through heater needs water moving. I couldn’t verify this against Bosch documentation.
- A dirty salt sensor. How To Fix It says that on some models, if the salt LED lights up along with the code, the sensor may be sending incorrect signals.
- Voltage fluctuations or power surges (Hoffmann Brothers).
Symptoms You May Notice
EasyBear lists these signs with an E09 fault:
- Water stays cold through the cycle
- Greasy dishes after washing
- The sanitize light doesn’t come on
These match the idea of a heater that isn’t working, but they can have other causes too.
How to Fix Bosch Error Code E09
Step 1: Reset the dishwasher
Turn it off, then unplug it or flip the breaker for about 30 seconds and restart it (How To Fix It). EasyBear describes a five-minute breaker reset as something an owner can try. Run a cycle to see whether the code comes back.
Step 2: Check the hot water supply
EasyBear suggests confirming that hot water is reaching the dishwasher. Run the kitchen hot tap and check that it gets hot.
Step 3: Check the salt LED and salt sensor
If the salt LED is lit along with E09, How To Fix It suggests cleaning the salt sensor. This only applies to models that have one.
Step 4: Listen and feel during a hot cycle
EasyBear says an owner can run a hot cycle and check whether the door stays cold while the pump is clearly running. That points to a heater that isn’t heating.
Step 5: Stop and call a technician
The remaining checks involve electrical testing. EasyBear describes a technician sequence: disconnect power, measure the heater’s resistance (it expects about 10 to 20 ohms across the terminals, a figure I couldn’t verify against Bosch documentation), check for a ground fault, inspect the element, and then test the control board’s heater relay output. MyPros says the first step on the model it covers is to check continuity between the heating element and the power module harness connector, and replace the power module if that check points to it.
A Warning About One Source
The Hoffmann Brothers page defines E09 as a heating issue, but its DIY steps are about the leak sensor, drain pump, inlet hoses, float switch, and filters, which don’t clearly match a heating fault. I haven’t included those steps as an E09 fix. Cleaning your filters is still good maintenance, but don’t expect it to clear a heater fault.
DIY or Technician?
Reasonable DIY:
- Power reset
- Checking that hot water reaches the dishwasher
- Cleaning the salt sensor if your model has one and the salt LED is on
Technician:
- Testing the heating element’s resistance or continuity
- Testing the relay on the control board or power module
- Replacing the heater, power module, or control board
- Anything involving the sump or live electrical parts
EasyBear says the heater is submerged and runs at line voltage, so power must be disconnected and capacitors discharged first. That’s a good reason to leave this to a professional.
How Much Does an E09 Repair Cost?
EasyBear, a repair company, lists a professional repair at $250 to $400, including diagnosis and labor, with the lower end usually meaning a straightforward heater replacement and the higher end applying when the control board relay has failed. That is one company’s pricing and not an industry figure, and the page has a commercial interest. Hoffmann Brothers lists no prices. Get a quote after diagnosis, and check your warranty first.
Which Fix First?
| What you notice | Try first |
| E09 appeared once and cleared | Reset and monitor |
| E09 with cold water and greasy dishes | Check hot water supply, then call a technician |
| E09 with the salt LED lit | Clean the salt sensor if your model has one |
| E09 returns after a reset | Technician to test the heater and relay |
How E09 Compares With Other Bosch Codes
| Code | Commonly described as |
| E01 | Temperature sensor or thermistor problem |
| E04 | Water flow sensor, circulation pressure, or heater circuit (varies by source) |
| E09 | Heating circuit, heating element, or relay fault |
| E15 | Water detected in the base pan (leak protection) |
| E24 | Drain problem |
These descriptions come from sources linked in this and related articles and can vary by model.
Frequently Asked Questions
What does error code E09 mean on a Bosch dishwasher?
It’s generally described as a heating circuit fault, meaning the heating element isn’t working or isn’t getting power.
How do I reset E09?
Turn the dishwasher off, then unplug it or flip the breaker for about 30 seconds and restart it.
Can I fix E09 myself?
You can try a reset, check the hot water supply, and, on models with one, clean the salt sensor. Testing or replacing the heater, relay, or power module is better left to a technician.
What causes E09?
The most commonly cited cause is a burnt-out heating element. Others include a failed connection, a faulty relay on the control board or power module, and temperature sensor problems.
Is E09 dangerous?
The code points to a heating fault, not a leak. The heater runs at line voltage and is submerged, according to EasyBear, so don’t open the machine up yourself.
Why is my dishwasher not heating water?
A dead heating element or a relay not switching power to it are the usual explanations in the sources. Check that hot water is reaching the machine as well.
Can a clogged filter cause E09?
The sources I found tie E09 to the heater, not the filter, although EasyBear says a weak or stuck circulation pump can trigger it secondarily. Hoffmann Brothers lists filter cleaning, but its steps don’t match its own description.
Should I keep using the dishwasher with E09?
If the code returns after a reset, have it checked. Dishes washed without working heat may come out greasy, as EasyBear notes.
Conclusion
Bosch error code E09 points to a heating problem, most often a burnt-out heating element or a relay on the control board or power module that isn’t switching power to it. Try a power reset, confirm hot water is reaching the dishwasher, and clean the salt sensor if your model has one and the salt light is on. If E09 comes back, call a qualified technician to test the heater and relay, because the work involves submerged line-voltage parts. Get a quote after diagnosis, and check your warranty before paying for a repair.
