Dishwasher
E19
The E19 error code on an AEG dishwasher indicates a fault with the hot water flow sensor or heating circuit — specifically, the appliance isn’t detecting the correct water temperature during the wash cycle. It’s a moderately serious fault that will stop the machine completing a cycle, but in many cases it’s fixable without a professional.
What does this error mean?
AEG’s E19 code signals that the dishwasher’s control board has detected an anomaly in the heating or temperature-sensing system — the machine expected water to reach a certain temperature within a set time, and it didn’t. This is typically linked to the flow heater (also called an inline heater or thermoflow unit), its associated temperature sensor (NTC sensor), or the wiring connecting them. The dishwasher is protecting itself from running a cycle at the wrong temperature, which could leave dishes unhygienic.
Est. repair cost
DIY part only: £15–£40 (NTC sensor) or £50–£90 (flow heater). Professional repair: £80–£160 all-in.
🔍 Likely causes
🛠️ Step-by-step fix
Reset the dishwasher: Turn it off at the mains socket, wait 5 minutes, then power it back on and run a short cycle. A software glitch can trigger E19 and a hard reset clears it in some cases.
Check and clean the filter and spray arms: A blocked filter restricts water flow, which can prevent the heater from functioning correctly. Remove the bottom filter basket, rinse under the tap, and use a soft brush to clear any debris from the spray arm holes.
Run a dishwasher cleaner or descaler: If you’re in a hard water area, heavy limescale on the heater element can cause it to underperform. Use a dedicated dishwasher descaler (e.g. Finish Dishwasher Cleaner) on an empty hot cycle to dissolve build-up.
Inspect the door seal and spray arms for blockages: Ensure water is circulating freely. A cracked spray arm or failing door seal can affect wash performance and sometimes trigger sensor faults indirectly.
Check behind the kick plate for visible wiring issues: Remove the lower kick plate (usually unclips or has two screws) and visually inspect the wiring harness near the heater for any obvious burns, loose connectors, or corrosion. Do NOT open the main electrical housing — reconnect any loose plug connectors only if safe to do so.
If steps 1–5 haven’t resolved the fault, the NTC sensor or flow heater likely needs replacing — these are the two most common hardware causes of E19. Both are available as genuine AEG spare parts online (via AEG’s own spares site or suppliers like eSpares or 4YourHome). The NTC sensor is a straightforward DIY replacement; the heater is more involved but still DIY-feasible if you’re comfortable with basic appliance repairs.
📞 When to call a professional
If the error persists after descaling, resetting, and cleaning, and you’re not comfortable accessing the heater or wiring, call a qualified appliance engineer. Tell them: ‘My AEG dishwasher is showing error code E19 — I believe it’s a heating circuit or NTC sensor fault.’ If the control board (PCB) is suspected, this is definitely a job for a professional, as PCB diagnosis and replacement requires specialist tools and knowledge.
⚖️ Repair or replace?
A professional repair for an E19 fault — typically a new NTC sensor or flow heater fitted by an engineer — will cost £80–£150 including labour. If the PCB is at fault, expect £150–£250+. For a dishwasher under 7 years old, repair is almost always worthwhile. For machines over 8–10 years old, particularly if other components are ageing, a new mid-range AEG dishwasher (£400–£600) may be more economical long-term than a costly repair.