Dishwasher
E19
The E19 error code on a Siemens dishwasher points to a fault with the flow heater or its temperature sensor — it’s a moderately serious fault that will stop your machine from completing a wash cycle until it’s resolved.
What does this error mean?
E19 indicates that the dishwasher’s control board has detected a problem with the flow-through heater (also called the inline heater or heating element) or the NTC temperature sensor that monitors water temperature during the wash. The machine cannot reliably heat water to the correct temperature, so it shuts down the programme as a safety precaution. This is different from a simple blockage fault — it points to an electrical or component-level issue within the heating circuit.
Est. repair cost
£90–£180 professional repair (parts + labour); NTC sensor DIY part £10–£25, flow heater DIY part £30–£60 (professional fitting recommended)
🔍 Likely causes
🛠️ Step-by-step fix
Reset the machine: Turn the dishwasher off at the mains, wait 5 minutes, then switch it back on and run a short programme. A one-off electrical glitch can occasionally trigger E19 — a hard reset clears it.
Check and clean the filter and spray arms: A blocked filter forces the heater to work harder and can cause it to overheat. Remove the filter basket at the bottom of the tub, rinse it under a tap, and clear any debris from the spray arm holes.
Run a descaling cycle: If you live in a hard-water area, heavy limescale on the heater is a likely culprit. Use a dishwasher descaler (such as Finish Dishwasher Cleaner) and run it on the hottest programme available. Do this monthly as prevention.
Inspect the door seal and base for leaks: A water leak reaching the heater wiring can cause the E19 fault. Open the door and visually check the door gasket for cracks or gaps. Look under the machine for any moisture or pooling water.
Check for a tripped thermal cutout: If you’re comfortable removing the lower kick panel (no live components are exposed here), check whether the thermal fuse on the heater unit has a visible break. This part costs £5–£15 and is replaceable — but if you’re unsure, stop here and call a professional.
If the fault persists after all the above steps, the flow heater or NTC sensor itself has likely failed. Replacing these components requires disconnecting electrical parts inside the machine — this should be done by a qualified appliance engineer.
📞 When to call a professional
If the E19 error returns after a reset, descale, and filter clean, stop DIY work and call a qualified appliance repair engineer. Tell them your machine model number (found on the inner door frame), that it’s displaying E19, and that you’ve already ruled out limescale and filter blockages. Replacing a flow heater or NTC sensor involves working inside the appliance with electrical connections, which is not safe for unqualified homeowners.
⚖️ Repair or replace?
A professional repair for an E19 fault — typically a flow heater or NTC sensor replacement — costs around £90–£180 including labour in the UK. If your Siemens dishwasher is under 7 years old and was a mid-to-premium model (£400+), repair is almost always the better value. If the machine is over 10 years old or was a budget model, a new dishwasher from £250–£350 may make more financial sense than an £150+ repair bill.