The E09 error on your Bosch dishwasher means the heating element has failed — water won’t reach wash temperature, so the cycle aborts. It’s also displayed as E9 on some models. The element itself isn’t owner-replaceable on most models, so the safe checks come first, then a technician.

Error code E09 (also shown as E9)
Meaning Heating element fault
Severity Medium — limited DIY, mostly technician
Time to fix 5 min reset, otherwise technician callout
Tools needed None for the safe checks

What the E09 error means

Modern Bosch dishwashers heat the wash water using a flow-through heating element built into the circulation pump assembly, rather than a separate exposed coil. The control board monitors water temperature against a target curve during the cycle. If the element doesn’t bring the water up to temperature in the expected time, E09 displays. The cause is almost always the element itself — burnt out, scaled, or shorted — though sensor and control faults can produce the same code.

Common causes

  • Heating element burnt out or short-circuited (most common)
  • Limescale build-up on the element causing it to overheat and fail
  • Faulty water temperature sensor giving wrong readings
  • Wiring fault between element and control board
  • Control board fault (least common)

How to fix the E09 error

  1. Run the kitchen faucet hot before starting. Run hot water at the sink for 30–60 seconds before starting the dishwasher so the fill begins warm. This reduces the work the element has to do and sometimes lets a borderline element complete a cycle.
  2. Confirm rinse aid and detergent. Check the rinse aid reservoir is topped up and you’re using a dishwasher detergent rated for your machine. Wrong detergent can cause foaming that masks a temperature reading and trips E09.
  3. Reset at the breaker for 5 minutes. Switch the dishwasher off at the wall or circuit breaker, wait five minutes, restore power. If E09 was triggered by a one-off control glitch, the reset clears it.
  4. If E09 persists, the heating element has almost certainly failed and needs replacing. On Bosch dishwashers the element is integrated with the circulation pump assembly, which is not a typical homeowner job. Book a Bosch-trained technician — element replacement is usually $150–$300 fitted.

FAQ

Can I still use the dishwasher with E09?
Not safely — the cycle won’t complete because the water won’t heat. Running it cold leaves dishes badly washed and detergent residue on the load. Stop using it until the element is replaced.

Will limescale really kill the heating element?
Yes. Scale acts as an insulator on the element surface, causing local overheating that eventually burns out the element. In hard-water areas, regular use of dishwasher salt and an occasional descaler cycle extends element life significantly.

Is E09 the same as E9?
Yes — different displays render the code differently. Both point at the same heating fault and the fixes are identical.