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Wi-Fi temperature and humidity sensor - 4 out of 5 do not connect, blue LED on

stasiek37 1170 14
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  • #1 21539932
    stasiek37
    Level 10  
    Posts: 8
    Hello.
    I have a problem with a Wi-Fi temperature and humidity sensor, it does not want to pair.
    Out of the 5 sensors I bought 4 I can't pair, The blue LED on the fifth one lights up red and it found the device with no problem.
    AI: What exactly is the model and manufacturer of these sensors? .
    Aliexpres.
    AI: What app or method do you use to pair the sensors with Wi-Fi and does your network operate on 2.4 GHz or 5 GHz? .
    Smart life.
    Attachments:
    • Wi-Fi temperature and humidity sensor - 4 out of 5 do not connect, blue LED on 1746455790966417393931477018788.jpg (4.53 MB) You must be logged in to download this attachment.
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  • #2 21541710
    techlock
    Level 33  
    Posts: 1804
    Help: 195
    Rate: 482
    When pairing, enable GPS on the smartphone and grant access for the app, without GPS it will not pair.
    The sensor only works in the 2.4 Ghz WiFi range.
    Check the power supply batteries for nominal voltage of 1.5 V.
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  • #3 21541723
    stasiek37
    Level 10  
    Posts: 8
    >>21541710 >>21541710 .
    GPS, Wi-Fi and Bluetooth on, I also took turns doing different configurations.
    Batteries new, I checked with others too.
    Router supports 2.4 GHz - one sensor works on the same.
    Ideas have run out.
    The puzzling thing is the colour of the blue LED....
  • #4 21541727
    techlock
    Level 33  
    Posts: 1804
    Help: 195
    Rate: 482
    Check the pairing instructions for how to trigger a reset, there should be a button on the pin, probably press for 5 sec.
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  • #5 21541730
    stasiek37
    Level 10  
    Posts: 8
    I reset, no change.
  • #6 21541735
    techlock
    Level 33  
    Posts: 1804
    Help: 195
    Rate: 482
    Specify the exact model?
    You probably have the BT (Bluetooth) version and it will only work over BT.
    There are different versions, Wi-Fi and BT only.
    For pairing the LED should blink rapidly.
    If it's the BT version then turn off Wi-Fi, LTE, leave only BT on and pair.
  • #8 21541748
    techlock
    Level 33  
    Posts: 1804
    Help: 195
    Rate: 482
    Take a photo of the board from the battery side. In the instructions on page 1 will be the model name, e.g. Model: TH01
    From the link it looks like the sensors should work over Wi-Fi, that doesn't mean they sent you the model you ordered, maybe you got the model for ZigBee.
  • #9 21541770
    stasiek37
    Level 10  
    Posts: 8
    Ok, I'll send it later.

    Added after 7 [hours] 25 [minutes]: .


    Temperature and humidity sensor with an open battery compartment and a user manual on a black surface. .
    Attachments:
    • Wi-Fi temperature and humidity sensor - 4 out of 5 do not connect, blue LED on 20250507_160647.jpg (2.32 MB) You must be logged in to download this attachment.
  • #10 21542293
    techlock
    Level 33  
    Posts: 1804
    Help: 195
    Rate: 482
    It is not clear from the pictures what model it is. Disassemble the case and take a photo of the board.
    Try manually selecting the device type when pairing.

    Screenshot from an app showing different types of temperature and humidity sensors to select during device pairing. .
  • #11 21542518
    stasiek37
    Level 10  
    Posts: 8
    By hand
    Information label on a box with product and manufacturer details for a temperature and humidity sensor. also tried, I am sending the model
  • #12 21542783
    techlock
    Level 33  
    Posts: 1804
    Help: 195
    Rate: 482
    If you can't enter pairing mode (fast blinking LED) then it comes out that the sensors are factory defective.
    If you bought from this link, make a return on ali, the system will generate a free return label, send back the faulty goods and you will get your money back from ali. As a reason for return write that you no longer need it, if you choose the reason damaged, you will have to attach some photos, videos, etc. and it will only complicate the return process.
    Reading the comments from the link other users have also received defective ones. Good advice, read the comments before you buy.
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  • #13 21554199
    stasiek37
    Level 10  
    Posts: 8
    Write down what is the specific model under wifi
  • #14 21554427
    techlock
    Level 33  
    Posts: 1804
    Help: 195
    Rate: 482
    Model: TH01 supports WiFi such a search, e.g. pl.aliexpress.com/item/1005005234605015.html
  • #15 21554534
    stasiek37
    Level 10  
    Posts: 8
    Thanks to
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Topic summary

✨ The discussion concerns Wi-Fi temperature and humidity sensors purchased from AliExpress, where 4 out of 5 units fail to pair despite the blue LED being on. The sensors operate exclusively on 2.4 GHz Wi-Fi and require GPS enabled on the smartphone for pairing via the Smart Life app. Batteries were confirmed new and at nominal voltage. Attempts to reset the sensors using a pinhole button were unsuccessful. It was suggested that some units might be Bluetooth-only versions, which require different pairing procedures, but the purchased units appear to be Wi-Fi models without a visible reset button on the battery side. Photos of the sensor boards were requested to identify the exact model, as some units might be ZigBee versions or factory defective. The model TH01 was identified as a Wi-Fi compatible sensor similar to the ones linked. The consensus is that non-pairing sensors are likely factory defective, and a return through AliExpress with a free return label is recommended. Users are advised to check product comments before purchase due to reported defects.
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FAQ

TL;DR: These Smart Life sensors are 2.4 GHz-only; "without GPS it will not pair." Use 1.5 V batteries and try a 5 sec reset. [Elektroda, techlock, post #21541710]

Why it matters: This FAQ helps Smart Life Wi‑Fi sensor buyers fix pairing issues fast and avoid buying the wrong radio variant.

Quick Facts

How do I fix Smart Life Wi‑Fi temperature sensors that won’t pair?

Enable smartphone GPS and grant the app location permission. "Without GPS it will not pair." Connect your phone to 2.4 GHz Wi‑Fi. Avoid 5 GHz during setup. Install fresh 1.5 V batteries. Start pairing in Smart Life and wait for discovery. If it still fails, retry after reseating the batteries. [Elektroda, techlock, post #21541710]

Do these sensors work on 5 GHz Wi‑Fi?

No. These sensors operate only on 2.4 GHz Wi‑Fi. Connect your phone to the 2.4 GHz SSID before starting pairing. If your router merges bands, use a temporary 2.4 GHz‑only network during setup. [Elektroda, techlock, post #21541710]

How do I put the sensor into pairing mode or reset it?

Use the pinhole reset. Press and hold the reset pin for about five seconds to trigger pairing/reset. The exact method varies, so follow the device’s quick guide for timing. Tip: Keep the phone close to the sensor during the process to maintain signal quality. "Press for 5 sec." [Elektroda, techlock, post #21541727]

What does the LED behavior mean when pairing?

Fast blinking indicates the sensor is in pairing mode and ready to be added. Colors may vary by batch, so focus on the blink pattern. "For pairing the LED should blink rapidly." If it never blinks fast, proceed to reset or assess a defect. [Elektroda, techlock, post #21541735]

No fast blink even after reset — what then?

If you cannot enter pairing mode after a reset, treat the unit as defective. "If you can't enter pairing mode ... the sensors are factory defective." Start an AliExpress return. Choose “no longer need” to avoid extra evidence steps, and use the free return label. Other buyers reported faulty batches too. [Elektroda, techlock, post #21542783]

Could the seller ship Zigbee or BT sensors instead of Wi‑Fi?

Yes. Listings may show Wi‑Fi, but some buyers receive Zigbee variants that won’t pair with Wi‑Fi. Check your manual’s first page for the exact model name, and verify the radio type. If it’s Zigbee or BT‑only, it won’t join Wi‑Fi. [Elektroda, techlock, post #21541748]

How do I identify my exact model?

Open the case carefully and check the first page of the instructions for the model name. The helper noted you’ll see it like “Model: TH01.” If that’s missing, photograph the PCB for reference when contacting the seller. This helps confirm Wi‑Fi vs Zigbee/BT versions. [Elektroda, techlock, post #21541748]

Where is the reset pin on this casing variant?

On this version, there is no back reset button under the battery cover. The only reset access is a pinhole on the bottom; use a needle or SIM tool to press it. "Only the reset is from the bottom with the needle." [Elektroda, stasiek37, post #21541743]

Can I manually select the device type in Smart Life to improve pairing?

Yes. In the app, add a device and manually choose the sensor category that matches your unit. This avoids auto-scan misses and can force the correct onboarding flow. "Try manually selecting the device type when pairing." Keep the phone near the sensor while adding. [Elektroda, techlock, post #21542293]

Which exact model should I buy if I specifically want Wi‑Fi?

Search for and buy Model: TH01 if you want Wi‑Fi support. The helper confirmed: "Model: TH01 supports WiFi." Verify the listing and photos match the Wi‑Fi version before purchasing to avoid Zigbee/BT variants. [Elektroda, techlock, post #21554427]

How do I pair a Bluetooth‑only version?

Turn off Wi‑Fi and mobile data on your phone to avoid conflicts. Leave only Bluetooth enabled, then perform the in‑app pairing. As advised: "Leave only BT on and pair." Note that BT‑only models won’t connect to your Wi‑Fi network. [Elektroda, techlock, post #21541735]

What app should I use to pair these sensors?

Use the Smart Life app, as used in this thread. Install it, create an account, and follow the add‑device flow. Ensure location permission is granted when the app requests it during pairing. Quote from the case: "Smart life." [Elektroda, stasiek37, post #21539932]

Do I need to enable GPS/location on Android for pairing?

Yes. Enable GPS and allow the app access, or pairing fails on Android. The helper’s advice is clear: "Without GPS it will not pair." Keep GPS on until the device appears in the app and finishes setup. [Elektroda, techlock, post #21541710]

What battery voltage do these sensors need?

Use fresh batteries at a nominal 1.5 V each. Low or unstable voltage can prevent entry into pairing mode or cause drops mid‑setup. Measure cells if unsure and replace weak ones. Install batteries just before pairing to minimize idle drain. [Elektroda, techlock, post #21541710]

Only 1 of my 5 sensors pairs. Is that normal?

No. In the case discussed, 4 of 5 sensors would not pair, an 80% failure rate. That suggests a problem, such as a defective batch or mismatched radio variants. Check model markings and pairing mode, then pursue a return if needed. [Elektroda, stasiek37, post #21539932]

Quick 3‑step pairing checklist (How‑To)

  1. Enable phone GPS and allow the Smart Life app location permission.
  2. Connect your phone to 2.4 GHz Wi‑Fi (avoid 5 GHz during setup).
  3. Insert fresh 1.5 V batteries and start in‑app pairing near the sensor. [Elektroda, techlock, post #21541710]
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