Question about Garmin Forerunner 305 GPS Receiver

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Recently purchased a edge 305cadenec/heart rate monitor.cadence is not coming up on the monitor. every thing else is working. Pushed the reset button on the sensor the speed light was fine the cadence light seem to be missing now and then,the magnet seems to be in the right place.

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  • Anonymous Mar 16, 2014

    Recently purchased Garmin Edge 800 and had no problem setting it up with the Garmin hr monitor and speed/cadence sensor. I thought all was well until I rode the bike and realized that the Edge was doubling my road speed and hence miles covered as well. It would occasionally momentarily flash the correct speed but would bounce right back to double where it was 99% of the time. Unit was also pausing momentarily and then immediately resuming. This Edge 800 is new but I have one several years old that I use on another bike and when I tried that older unit on the new bike it did the same thing, doubling speed and mileage and pausing and resuming frequently. Is there anything in the set up process that I missed and that would cause both units to do the same thing? Any suggestions would be appreciated.

  • Anonymous Mar 27, 2014

    How do I pair a wahoo heart rate monitor and wahoo speed and cadence sensor to a garmin 510

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  • 3 Answers

Suggest you first try changing the battery in the sensor...then reset, then rescan for it on unit. It seems like quite a few have been shipped with dud batteries.

Good luck!

Posted on Nov 28, 2008

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I just helpped some one else with same probelm, try this see if it works.


In the battery compartment there’s a gold contact that touches the top of the battery (+ve) which was in a position that would never make contact with the battery. I bent it out slightly, made sure the battery was seated correctly (i.e. flat) and as if by magic my heart rate appeared on the large Garmin display!


Also found this..........

I Have had the same problem couple of times (and forgotten each time how I solved it). I figured it out just now and this is what I did.

1) turn on unit and put on heart monitor (make sure battery is good and wet heart strap)
2) using the mode button navigate the menus to: Settings: General: Accessories: Heart Rate Monitor
3) Once in the Heart Rate Monitor option make sure "Yes" is selected and then use the arrow buttons to highlight "Restart Scan" . Press the enter button to rescan for your heart monitor. (I had to rescan twice)
Go back to the main monitor screen to see if you are recieving heart rate signals.

I am not sure why a manual rescan needs to be done every time but it would be nice if Garmin fixed this issues in a unit software update (my unit has software version 2.80


Hope this helps......

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My garmin forerunner 305 HRM suddenly stopped working. I thought it was a bad battery so replaced that, and still nothing. Any other suggestions?


I found this on the internet......

In the battery compartment there’s a gold contact that touches the top of the battery (+ve) which was in a position that would never make contact with the battery. I bent it out slightly, made sure the battery was seated correctly (i.e. flat) and as if by magic my heart rate appeared on the large Garmin display!


Also found this..........

I Have had the same problem couple of times (and forgotten each time how I solved it). I figured it out just now and this is what I did.

1) turn on unit and put on heart monitor (make sure battery is good and wet heart strap)
2) using the mode button navigate the menus to: Settings: General: Accessories: Heart Rate Monitor
3) Once in the Heart Rate Monitor option make sure "Yes" is selected and then use the arrow buttons to highlight "Restart Scan" . Press the enter button to rescan for your heart monitor. (I had to rescan twice)
Go back to the main monitor screen to see if you are recieving heart rate signals.

I am not sure why a manual rescan needs to be done every time but it would be nice if Garmin fixed this issues in a unit software update (my unit has software version 2.80

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I Have had the same problem couple of times (and forgotten each time how I solved it). I figured it out just now and this is what I did.

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2) using the mode button navigate the menus to: Settings: General: Accessories: Heart Rate Monitor
3) Once in the Heart Rate Monitor option make sure "Yes" is selected and then use the arrow buttons to highlight "Restart Scan" . Press the enter button to rescan for your heart monitor. (I had to rescan twice)
Go back to the main monitor screen to see if you are recieving heart rate signals.

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My solution included changing the battery in the cadence sensor (GSC10). You might not need to.
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I love google today;o)

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Had the same problem. Here is how I fixed it.
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2. Turned on my garmin 305 edge outside to acquire satellites (probably not nec but did it anyway)
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