Freezer
E5
The E5 error code on an AEG freezer indicates a fault with the evaporator temperature sensor (NTC sensor), meaning the appliance can no longer accurately monitor its internal temperature. It’s a moderately serious fault — your freezer may stop cooling properly and food could be at risk if left unresolved.
What does this error mean?
AEG freezers use an NTC (negative temperature coefficient) thermistor to continuously measure the temperature inside the freezer compartment. When the control board detects a reading outside the expected range — or no reading at all — it throws the E5 code as a safety alert. This typically means the sensor has failed, its wiring has become damaged, or there’s a connection fault between the sensor and the main PCB.
Est. repair cost
£10–£25 DIY NTC sensor replacement; £80–£180 for a professional repair (sensor or PCB)
🔍 Likely causes
🛠️ Step-by-step fix
Power off and reset: Unplug the freezer from the mains, wait 10 minutes, then plug it back in. A temporary glitch can trigger E5, and a hard reset sometimes clears it.
Check for ice build-up: If the freezer has not been manually defrosted recently, run a full manual defrost (leave the freezer off with the door open for 24 hours). Excess ice around the evaporator can block or skew the sensor reading.
Inspect the sensor wiring: Remove the freezer’s rear internal panel (usually 2–4 screws) to access the evaporator area. Visually check the NTC sensor connector — reseat it firmly if it looks loose. Do not open any sealed electrical components.
Test the NTC sensor resistance: With the freezer unplugged, disconnect the sensor and use a multimeter set to resistance (Ω). At room temperature (~20°C), a healthy NTC sensor typically reads 5,000–10,000 ohms. A reading of 0 (short) or OL (open circuit) confirms a failed sensor.
Replace the NTC sensor: AEG replacement NTC sensors are available from UK appliance parts suppliers (e.g. eSpares, 4ourhouse) for £10–£25. Match the part number from your model’s data plate. Fit the new sensor, reattach the panel, and power on to check the code has cleared.
If E5 persists after a new sensor: The fault likely lies with the main PCB or wiring harness — stop here and call a qualified appliance engineer.
📞 When to call a professional
If replacing the NTC sensor does not clear the E5 code, the main control board (PCB) is the likely culprit — this requires professional diagnosis and is not a safe or cost-effective DIY job. Call a Domestic & General-accredited engineer or an independent appliance repair specialist and tell them: ‘AEG freezer showing E5 error, NTC sensor already replaced, suspect PCB fault.’ This helps them bring the right parts and saves call-out time.
⚖️ Repair or replace?
A professional repair for an E5 fault — whether sensor or PCB — typically costs £80–£180 in the UK including parts and labour. If your AEG freezer is under 8 years old and was mid-to-high range (£400+), repair is almost always worthwhile. If it’s over 10 years old or was a budget model, a replacement freezer from £200–£350 may be the smarter long-term investment.