Siemens dishwasher E09 error code
What E09 means on a Siemens dishwasher
Heating fault in the heat pump or heater circuit.
Meaning checked by NAC's engineers, 9 November 2026.
What our engineers say
On a Siemens dishwasher, the E09 code points to a heating fault in the heat pump or the heater circuit. The heat pump is the part that both pumps the water round and warms it. You may notice the dishwasher is not heating, with dishes coming out cold and still wet, or that it is beeping or showing flashing lights.
When engineers find the cause, it is sometimes the heating part inside the heat pump, which has failed and no longer lets power through, so the water is never warmed. Engineers sometimes also find a water leak into the base of the machine, a worn door seal, or a side of the inner tub bulging outwards. These can be put right while the machine is being repaired.
An engineer typically runs the machine to see whether it heats, then tests the heater to confirm it has failed. The usual fix is a new heat pump, sometimes fitted along with a new pump seal, a tub repair kit or a new door seal. The replacement parts often have to be ordered, so they are fitted at a second visit, followed by a test wash to check the machine fills, heats and drains properly.
Written by our engineers from NAC's own jobs.
Faults this code turns up with
What our engineers found and fixed for each, from NAC's own repair records.
What we fixed. We'll add what our engineers found, the parts they fitted and what customers typically paid once enough of these repairs are confirmed. How we work out our figures.
Before you check anything yourself
- Switch the dishwasher off and unplug it, or turn it off at the isolator switch, before you touch anything. Our guide to safely isolating an appliance walks you through it.
- An error code tells you where to look, not that it's safe to take the dishwasher apart. Don't remove panels or covers to get at the parts it points to: that's an engineer's job.
- If it involves the mains supply, sealed parts, or you're not confident at any point, stop and book a qualified engineer rather than risk injury or further damage.
Rather leave it to us?
- Fixed-price quote before any work starts
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