Dishwasher
E11
The E11 error code on a Siemens dishwasher indicates a problem with the water heating system — specifically that the appliance isn’t reaching the correct temperature during a wash cycle. It’s a moderately serious fault that will prevent your dishes from being properly cleaned or sanitised, but in many cases it’s fixable without a professional.
What does this error mean?
E11 means your Siemens dishwasher’s control board has detected that the water temperature is not rising as expected within a set time period. The machine monitors water temperature throughout the wash cycle, and if it stays too low for too long, it throws the E11 fault and halts the programme. This is most commonly linked to the heating element, the NTC temperature sensor, or the thermostat — all of which sit at the base of the machine.
Est. repair cost
£80–£160 for a professional repair; £15–£45 DIY for NTC sensor or heating element parts
🔍 Likely causes
🛠️ Step-by-step fix
Reset the dishwasher: switch it off at the mains, wait 60 seconds, then turn it back on and start a fresh cycle. A one-off software glitch can occasionally trigger E11 and a reset clears it.
Check the water supply temperature: ensure your home’s hot water supply is working normally. If you’ve had a recent boiler issue, the dishwasher may be receiving unusually cold water.
Inspect and clean the filter and sump area: remove the bottom basket and unscrew the filter. A heavily blocked filter can affect water circulation around the heating element, indirectly causing temperature problems. Rinse it thoroughly under the tap.
Check for visible wiring damage: with the machine switched off and unplugged, carefully remove the bottom kickplate panel. Visually inspect the wiring connectors to the heating element and NTC sensor for any obvious loose connections or burn marks — press any loose connectors firmly back into place. Do not open sealed electrical components.
Test or replace the NTC temperature sensor: the NTC sensor is a small, inexpensive part (typically £10–£25) clipped near the heating element. If you’re comfortable using a multimeter, test it for resistance (a working Siemens NTC sensor typically reads around 10kΩ at 25°C). A reading of zero or infinity confirms it’s faulty — replace it.
If the above steps don’t resolve the fault, the heating element itself is likely failed and will need replacing — this is a manageable DIY job for a confident homeowner, but if you’re unsure, book a qualified appliance engineer at this stage.
📞 When to call a professional
Call a qualified appliance repair engineer if resetting the machine, cleaning the filter, and reseating connectors haven’t cleared the E11 fault. Tell them you’re seeing error code E11 on a Siemens dishwasher and that you suspect a heating element or NTC sensor fault — this helps them bring the right parts. Also call a professional if you notice any burn marks, melted plastic near wiring, or a burning smell, as these indicate a more serious electrical fault.
⚖️ Repair or replace?
A professional repair for an E11 fault — typically a heating element or NTC sensor replacement — costs around £80–£160 including labour. If your dishwasher is under 5 years old, repair is almost always the right call. For machines 8 years or older, weigh the repair cost against a new mid-range Siemens dishwasher (£400–£700); if the repair exceeds 50% of replacement cost, replacing is the smarter investment.