Hi, I have a similar unit, and have used it for about 4000 miles thi summer. I am sure you are wetting the rough pads with water on the chest sensor before wearing it. Some people use a special gel. If that doean't work I would contact Garmin - they are very good about repalcing defective units.
There are some interesting things about this monitor you should know. The % grade function is not very accurate unless you are on steady terrain. It takes a while for the GPS and the barometric sensor to get a consistent reading, but it does give an idea of your climb or descent.
Now the scary part! They also make a unit that has a cadence feature. But they needed to be able to sell a calories burned feature with all other models, so they pegged calories burned to the speed sensor - NOT the heart rate, although the cadence model does somefurther correction. So if you live on a big hill the thing will tell you that you burn more calories flying down the hill than grinding your way up. So the calorie function isn't any better than the machines at the gym. (Maybe worse) Because you are relatively stationary on a gym bike, there also is no way to use the bike in the gym with the unit except to get a heart rate reading.
I enjoy down loading the information to my computer each night. It makes a nice record for distance, speed, pace etc. I doubt this unit was designed by much of a cyclist, but I like it even though I know calories and % grade are not accurate.
Hope that helps,
Do, or Do Not.
There is no "TRY"!
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