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Speed sensor 2 flashing alternately red and green

Hi all,

I've a brand new speed sensor 2 (amazon), but I don't can pair it correctly booth phone and my garmin forerunner 645.

So, I tried to pair it to Garmin Connect on my iPhone, but without success. So I disassembled and reassembled the battery. I tried several times. At the end the sensor pairs, but the App was unable to update the firmware of the sensor.
Then, I have paired it with my Forerunner. At first it seemed ok, but riding with my bike, no data had been recorded.

Then I saw that the sensor led was flashing alternately red and green for seconds.

what can be the problem?

Thanks

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0 aweatherall over 4 years ago

https://www8.garmin.com/manuals/webhelp/speed-cadence-sensor/EN-US/GUID-716D268E-17F3-41BD-A93C-C5E6555584FD.html

NOTE: The LED flashes red and green for a few seconds after battery replacement. When the LED flashes green and then stops flashing, the device is active and ready to send data.

0 1497606 over 4 years ago in reply to aweatherall

thanks for the answer,

but the LED flashes red and green always, no more after battery replacement, and my devices dont collect any data.

In practice sensor don't works

0 aweatherall over 4 years ago in reply to 1497606

That sounds like it is stuck doing a software update

0 1497606 over 4 years ago in reply to aweatherall

mmm actually when i made pairing with Garmin Connect, the App try to update the firmware, but it stopped shortly after, every time I tried.

How could I resolve it?

Thanks

0 aweatherall over 4 years ago in reply to 1497606

Will it connect to the phone app?

0 1497606 over 4 years ago in reply to aweatherall

Yes, it connect to the app, but not always, and when it connect, it doesn't can update firmware. I don't know why, but each time the updating failures.

0 aweatherall over 4 years ago in reply to 1497606

You will need to contact Garmin Support. They may need to exchange the unit for you.

0 2539647 over 4 years ago

I had the same issue and did a bit of troubleshooting before I landed on this solution which worked. Try these steps and let me know if it works:

1) Remove the Garmin Connect App

2) Remove the Bluetooth devices from the iPhone Bluetooth device list

3) Remove the battery in the speed sensor for 10 seconds

4) Re-install the Garmin Connect App

5) Put the battery back in the speed sensor

6) Go through the initial setup of the speed sensor in the Garmin Connect App

7) Success!

*Note* not sure if this had any impact but I disconnected from wifi during step 5 and on.

0 andydrummond over 4 years ago in reply to 2539647

Funnily enough, mine started really playing up after the last major Connect update. Uninstalling/reinstalling the app is a total faff.

0 cervelojames over 3 years ago in reply to 1497606

Having exactly the same issue