Question about Garmin Edge 305 GPS Receiver

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Garmin edge 305 heart rate sensor does not work

The heart rate sensor does not work. Battery seems okay. Ensured that system settings - accessories enabled the heart rate sensor, and even forced a rescan. The unit just does not pick up signals from the heart rate sensor belt.

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  • Anonymous Apr 13, 2008

    I too am experiencing the same issue and have just replaced the battery (CR2032) within the Heart Rate monitor strap.


  • JHolmes Apr 13, 2008

    Seems like we're having a run on this. I have the same problem. I did the following and still no signal:
    1. Rescanned for the HR monitor (yes, it's enabled!)
    2. Really wet down the electrode pads
    3. Checked the contacts inside the battery compartment to make sure they are in contact with the battery bottom and side.
    4. Replaced the battery with a fresh 3V lithium- same standard as the factory

    Everything else works but the HR monitor doesn't! Any ideas? Thanks in advance!

  • Anonymous Apr 21, 2008

    Yeah same prob here, have just replaced battery in monitor belt but have not tried it yet. Read somewhere to ensure that belt is right way up i.e garmin logo is right way up? will try that also.

  • Sly Jackson May 15, 2008

    Same here. I have done all the above. Sometimes I will get a reading and then it will just disapear. I going to send this back !

  • Anonymous May 29, 2008

    Actually I managed to solve the problem by downloading and installing the latest edge 305 firmware versions for the system + GPS firmware. For some reason my Garmin Edge arrived with a GPS firmware version of 0 and a system firmware version which was out of date.

  • Steve922 Jun 13, 2008

    Mine stopped working the same time the cadence stopped working. I thought it was the receiver itself, but I replaced the battery in the cadence sending unit. That fixed that. But nothing I tried worked on the HR Monitor transmitor. I ended up ordering a new one and it work right away.

  • Anonymous Jul 31, 2008

    I've had the same problem with the HRM. If you go into settings under devices and hit the "Restart Scan" it will usually find it.

  • cabankston Sep 02, 2008

    I have the same problem with a 305 receiver that has been in storage since September 2006. The unit will not recognized the HM belt. I have changed the battery, cleaned the contacts, varied the position, and repeatedly initiated rescans. Nothing has worked. My local bike shop/dealer suggested a complete computer reset or reboot, but neither he nor I can figure out how to do that. I don't see any obvious way to remove the 305 battery or any reset button. I know the unit was working with the same strap in 2006 because I can download the data.

    Any help would be appreciated.

    Charles Bankston


  • Anonymous Jan 15, 2009

    same problem, tryed everything, but it won't work.

  • scottandheat Mar 21, 2009

    Same problem. Worked great the first 1.5 years. Have replaced the battery in the strap. no go. Did a rescan, no go. Repositioned the belt repeatedly, no go. Cleaned the strap. No go. Getting pretty frustrated over spending the kind of money on this unit!

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The rescan worked for me, didn't know it existed, briljant. Follow list below:settings/system/accessoires/rescan
I love google today;o)

Posted on Dec 09, 2010

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I had the same problem on my first ride with the Garmin. Fortunately my riding buddy had an identical setup that was working fine, so we could troubleshoot. Neither his strap nor his 305 worked for me but any combination of my units or his units worked fine for him. After determining that I did have a heartbeat (!) I relocated the strap a few inches to the left (Garmin Logo under my left pec). Has worked fine since.

Posted on May 28, 2008

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When my HRM wasn't working I went into the settings under devices and hit the restart scan option. It immediately found my heart rate.

Not sure if any of you have tried this already.

Posted on Jul 31, 2008

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I couldn't get an accurate heart rate reading on my Forerunner 305. Sometimes it would say my heart rate was 55 when I was running, it would not even display when I sat down (weird!), and was just erratic. I borrowed a friend's heart rate monitor, paired it with my 305 and it worked fine so I ordered another monitor off of Amazon. Well I got it today and it wouldn't work! So I did a search online and found this article: http://www.runbulldogrun.com/forerunner-305/i-fixed-my-garmin-forerunner-305-heart-rate-monitor/

I followed his instructions, bent the little wire out a bit and it works perfect now! YAY!!!

Posted on Sep 12, 2012

I fixed my problem as well. The actual sensors are the ribs in the strap, not the plastic housing like I thought. I cleaned the rib sections on the strap with acohol and it's been working flawlessly ever since. I think there was some reside coating from production on it. Once I cleaned it off, it was able to pick up my body reading.
I hope this helps someone !

Posted on May 28, 2008

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