Bosch dishwasher E09 error code
What E09 means on a Bosch dishwasher
Heating fault, usually in the heat pump circuit.
Meaning checked by NAC's engineers, 9 November 2026.
What our engineers say
When a Bosch dishwasher shows E09, it is reporting a heating fault, usually in the heat pump circuit. The heat pump is the part that warms the water as the machine washes. You may notice the dishes coming out cold or wet, beeping or flashing lights, the machine stopping partway through a cycle, or the electrics tripping.
Engineers sometimes find that the heat pump itself has failed and is no longer heating the water.
An engineer will usually check whether power is reaching the heat pump and test it electrically to see whether it has broken down. They may also look over the control board for any damage. The usual repair is to fit a new heat pump, and sometimes a new set of seals where it sits at the same time. The new part often has to be ordered and fitted at a second visit. Afterwards the engineer runs a hot wash to make sure the water heats properly and that there are no leaks.
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, with Bosch's own figures where we have enough of them.
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
- Same or next-day visits where available
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