Air Fryer
E1
The E1 error code on a Cosori air fryer points to a temperature sensor fault — specifically, the appliance has detected that its NTC thermistor (the internal heat sensor) is either not reading correctly or has failed altogether. It sounds alarming, but in many cases this is a fixable problem that doesn’t mean your air fryer is destined for the bin. In this guide, you’ll learn exactly what’s causing the E1 code, which safe DIY steps to try first, and when it’s time to call in a professional or consider a replacement.
What does this error mean?
The E1 error code on Cosori air fryers — including popular models like the CP158-AF, CAF-P585S, and the Dual Blaze range — is a temperature sensor error. Inside your air fryer sits a small component called an NTC (Negative Temperature Coefficient) thermistor. Its job is to continuously monitor the internal cooking temperature and feed that data back to the control board, so the appliance can regulate heat safely and accurately.
When the control board receives a reading from the thermistor that falls outside an expected range — either because the sensor is sending no signal, an abnormal voltage, or a wildly inaccurate temperature — it triggers the E1 fault and shuts the appliance down. This is a safety feature, not a malfunction in itself. The air fryer is essentially saying: “I can’t confirm it’s safe to keep heating, so I’m stopping.”
This is an electrical fault, not a gas-related one, so there is meaningful scope for safe DIY investigation before involving a professional.
Est. repair cost
£5–£15 for a DIY thermistor replacement; £85–£170 for a professional repair including control board replacement
🔍 Likely causes
🛠️ Step-by-step fix
Step 1 — Power cycle the appliance: Unplug the air fryer from the wall socket completely (do not just switch it off at the unit). Wait a full 10 minutes, then plug it back in and switch on. This allows capacitors to fully discharge and can clear a temporary software or sensor glitch. If the E1 code is gone, run a short cook cycle to confirm it doesn’t return.
Step 2 — Check your placement and ventilation: Make sure the air fryer has at least 15–20 cm of clear space on all sides and above the unit. Cosori recommends this in their UK manual. If it was placed in a tight cupboard alcove or against a wall, overheating may have triggered the sensor. Move it to an open countertop, allow it to cool for 30 minutes, and try again.
Step 3 — Clean the interior thoroughly, focusing on the heating element area: Unplug the unit and allow it to cool completely. Remove the basket and drawer, then use a damp cloth or soft brush to carefully clean around the heating element coil at the top of the cooking cavity. Grease deposits near or on the thermistor (a small probe or disc usually visible near the element) can cause false readings. Do not use abrasive scourers or spray water directly into the cavity.
Step 4 — Inspect the thermistor visually (no tools required): With the unit unplugged and cooled, shine a torch into the cooking cavity and look at the thermistor probe near the heating element. Check for visible damage — a cracked, blackened, or melted sensor is a clear sign of failure. If it looks physically damaged, this component needs replacing (see Step 6).
Step 5 — For VeSync-connected smart models, check for a firmware update: Open the VeSync app on your phone, navigate to your device settings, and check whether a firmware update is available. Install it, restart the app, and reboot the air fryer. A known firmware bug in some 2022–2023 Cosori smart models caused false E1 codes that were resolved by an update.
Step 6 — Order and replace the NTC thermistor (DIY-friendly with care): Replacement NTC thermistors compatible with Cosori air fryers are available from UK sellers on Amazon and eBay, typically for £5–£15. Search using your exact model number (printed on the base of the unit). The thermistor is usually held in place by a small clip or single screw and connected via a two-pin connector — no soldering required on most Cosori models. Unplug the unit, remove the basket, unclip the old sensor, disconnect the wire, connect the new one, and clip it back into position. Important: Only attempt this if you are comfortable with basic appliance DIY. Do not open the main body of the air fryer or touch any other wiring.
Step 7 — Reset the appliance after any repair: After replacing the thermistor or completing any cleaning, plug the unit back in and run it at 180°C for 5 minutes with an empty basket to confirm the E1 error has cleared and the temperature regulation is working correctly.
Step 8 — If the E1 persists after thermistor replacement, stop here: A continuing E1 error after a new thermistor has been fitted strongly suggests the control board (PCB) is at fault. Do not attempt to repair or replace the PCB yourself — this involves working with the main electrical components inside the appliance body and should be handled by a professional appliance repair technician.
📞 When to call a professional
You should call a professional appliance repair technician if: the E1 error persists after you’ve completed a full power cycle, cleaned the sensor area, and replaced the thermistor; if you can see visible burn damage, melting, or scorching inside the cooking cavity; or if the air fryer trips your home’s RCD/fuse board when plugged in (which suggests an internal short circuit).
When you call, tell the technician: ‘My Cosori air fryer [give your model number] is displaying an E1 error code, which I understand is a temperature sensor fault. I’ve already tried a power reset, cleaned around the heating element, and replaced the NTC thermistor, but the error persists. I suspect it may be a control board issue.’ This saves diagnostic time and demonstrates you’ve done the basics.
In the UK, you can find appliance repair engineers through the Domestic & General approved repairer network, Checkatrade, or Trustpilot-reviewed local repair shops. Always confirm they are experienced with small kitchen appliances before booking.
⚖️ Repair or replace?
**Repair cost vs replacement cost in the UK:**
If the fix is simply a new thermistor, you’re looking at a £5–£15 part and perhaps 20 minutes of your time — absolutely worth doing on any Cosori air fryer.
If the control board has failed, a professional repair will typically cost £60–£120 in labour plus parts (a replacement PCB for a Cosori can cost £25–£50 if available). Total professional repair bill: roughly £85–£170.
A brand new mid-range Cosori air fryer (such as the 5.5L or Dual Blaze models) currently retails in the UK for £70–£150, frequently on offer at Amazon, Lakeland, or Currys.
**Our recommendation:** If your Cosori is under 2 years old, it may still be covered by the manufacturer’s warranty — contact Cosori UK support first (support-uk@cosori.com). If it’s 2–4 years old and the fix is a thermistor, repair it without hesitation. If it’s over 4 years old and the control board has failed, the repair cost approaches or exceeds the price of a new unit — replacement makes more financial sense. Cosori parts availability is reasonable for current models but can be patchy for units over 3–4 years old, which is worth factoring in.