The short answer
On an AEG dishwasher, water or dishes not getting hot most often comes back to a temperature sensor reading wrongly, with a failed heating element close behind. Because the machine measures so much of its own behaviour, most faults arrive as a code that is really a timeout — a fill, a drain or a temperature that did not arrive in the window the program allows. The first checks below are owner work, but the ranking here points at a repair that ends in a service call, so do them to confirm rather than to fix.
What you are seeing
- What this fault looks like, and which observations point somewhere else.
- dishes cold and wet at the end of a cycle that ran its full length
- plastics dripping and glassware unheated when the door is opened
- no steam at all when the door is opened mid-cycle
- the cycle running much longer than usual before finishing
- Not this fault: if a breaker trips during the heat, go to the electrical-safety page
- Not this fault: if the dishes are dirty as well as cold, start on the cleaning page
Ranked causes on this platform
- Ranked for an AEG dishwasher, which runs a sensor-driven controller that reports a fault code on the display. No measured frequency exists for this address, so the order is platform judgement rather than a share.
- A temperature sensor reading wrongly — Why: A sensor reporting a temperature the machine has not reached stops the heater early, and the element itself is perfect.
- A failed heating element — Why: An element that has gone open circuit stops all heating at once and produces no other symptom.
- The heater relay on the control board — Why: A single failed output leaves everything else working, which is why the machine fills, washes and drains normally and never heats.
- Scale insulating the element — Why: In a hard-water area scale builds on the element until it cannot transfer heat, and the fault arrives gradually rather than suddenly.
- The program rather than the machine — Why: Eco and glass programs run cooler by design, and a machine switched to one of them is doing what it was told.
What to check, in order
- The order follows the ranking above: most likely and cheapest first, nothing needing a meter until everything else is eliminated.
- A temperature sensor reading wrongly — Because: a sensor reporting a temperature the machine has not reached stops the heater early, and the element itself is perfect.
- A failed heating element — Because: an element that has gone open circuit stops all heating at once and produces no other symptom.
- The heater relay on the control board — Because: a single failed output leaves everything else working, which is why the machine fills, washes and drains normally and never heats.
Checks you can safely do yourself
- Isolate the appliance before any panel comes off, and stop at the first step that explains the fault.
- Note whether the machine ends its cycle early as well as cold. — Tools: nothing — Time estimate: one cycle
- Open the door mid-wash and check for steam and for a warm tub floor. — Tools: nothing — Time estimate: a few minutes
- Confirm every other function is normal before suspecting the element. — Tools: nothing — Time estimate: a short observation
- Look at the element and the tub floor for a hard white deposit. — Tools: a torch — Time estimate: a few minutes
- Stop condition: Stop there: the next step means metering live terminals or opening a sealed system.
Safety first
Safety
Unplug the appliance or switch off its breaker before removing any panel, because a capacitor can hold a charge after the power is off. Isolate the circuit before reaching into the sump, and treat the water in a machine that has just run as hot enough to scald. Never defeat the door latch to run the machine open; the latch switch exists to stop the wash the moment the door moves.
When to call a technician
Call a technician when the machine reaches the end of a hot program with a cold tub and clean supply water, or when the heat has to be traced to an element or a relay. Testing a heating circuit means working at live terminals, which is where an owner stops.
The fact bundle for this address was empty, so no warehouse figure appears. Every number on the page is a program safety constant, cited to its publisher. — Sources
General guidance- 1910.147 — The control of hazardous energy (lockout/tagout) — Occupational Safety and Health Administration, fetched 2026-09-06
Other faults documented for this brand and appliance. — Nearest pages of the same kind
What this page does not cover
This page is generalized across every AEG dishwasher family and model number: no family fault list, no model parts list, and no measured figure from the program warehouse. Where a family- or model-specific page exists it goes deeper, and it should be preferred over this one.
Links: - [Common AEG Dishwasher Problems](/blog/aeg-dishwasher-problems) - [AEG Dishwasher: Abnormal Noise or Vibration](/blog/aeg-dishwasher-abnormal-noise) - [AEG Dishwasher: Does Not Clean or Dry](/blog/aeg-dishwasher-cleaning-performance)
Adjacent pages for what this one rules out. — Where to go next
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
