Guide 3: Xiaomi Air Fryer NTC thermistor failure – Error E1. 200K Ohm NTC thermistor

ID: 165439

Description: Related guide:...

Steps:

1. Document dedicated to the test of the 200 K ohm NTC temperature probe of the AIR FRYER XIAOMI hot air fryer, applies to this fryer and many others very similar
2. PHOTO 3: NTC PROBE is located next to the resistance.

3. Images showing the machine displaying Error E1 that will trigger roughly after a minute of being on. It can occasionally work normally by turning it on and off.

4. Image 1: Display of Error E1 which prevents the machine from functioning.
5. Image 2: View of the NTC probe connector on the control board.
6. Photo 3: Location of the NTC thermistor cartridge as seen from the outside.
7. For the disassembly of the machine, you can use the following document and the videos linked within it as your reference.

8. Guide for a homemade hooking tool to take apart the air fryer's NTC thermistor probe.

9. Bill of materials required for the test:
10. Multimeter with a 200K Ohm scale.
11. Sewing needles, since the probe connector is quite small.
12. A strip of electrical tape.

13. Image 1: Damaged/broken NTC air fryer probe.
14. Image 2: Replacement NTC 200K Ohm thermistor acquired from Aliexpress/Amazon.

15. Insert 2 sewing needles into the 2 connector terminals as shown in image 1.
16. Connect one end of an alligator clip to each one of the sewing needles and connect the other end of the wire to the multimeter as shown in image 2.
17. Place some electrical tape in between the red and black alligator clips to electrically isolate them from each other as shown in image 3.

18. The two alligator clips should be electrically isolated as shown in the image.

19. Check the initial reading: At 25ºC (or anywhere near that temperature), the thermistor must have a resistance of roughly 100K Ohms.

20. Apply heat to the thermistor/probe using a heat gun or a lighter. The probe resistance readings should gently decrease as the temperature increases. Since this one is damaged, it works unpredictably. Refer to the video for more clarification.
21. Youtube video that goes explaining each step, comparing the behavior of a malfunctioning probe with a normal one.
22. Other guides for this device: AIR FRYER XIAOMI