The heart rate function keeps saying its off; how do i turn it back on?

here is the manual
http://ns.suunto.com/Manuals/M1_M2/Userguides/Suunto_M1_M2_UserGuide_EN.pdf

Press and hold the reset button, for 5 seconds, while in Time mode. the heart monitor will reset and the symbol reappear on the screen

Press and hold the reset button, for 5 seconds, while in Time mode. this will reset the heart monitor and the symbol will reappear on the screen.

How do I turn the Heart Rate function on and off on my watch? Within the Date and Time screen, if the heart icon is showing, the heart rate function is on. To turn off the heart rate function, simply hold the Reset button until the heart icon goes away.

I got mine to start working by turning it on/off. This is done by pressing the top right, bottom right, and bottom left buttons for 5 seconds.

In checking out information about my new S7 ECG Heart Rate Watch, I noticed your posting. There is a Sportline website that enables you to down the product manual.... although I'm not sure it pertains to the S7. If this doesn't work, I'm sure there is a manual included with the watch I just received, and I'd be happy to email to you. I'll check back to see if you've posted a response here to see if the below website worked for you first. Posted 7/11/2010 by Mary G.
download product manual - HEART RATE WATCH 7. HELPFUL HINTS IN MEASURING HEART RATE. 8. SETTING THE WATCH FUNCTIONS ... stylish LED Heart Rate Watch measures ECG accurate heart rate with the simple ..... HEART RATE WATCH. Sportline® is a trademark of SPORTLINE, a division ...
http://www.cbs.sportline.com/manuals/SP4421IS01SPO1.pdf

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Click on my profile (escapement), then click on Tips and Tricks. There you will find link to all SPORTLINE watch manuals. Rate me, please.

Make sure the back of the watch is spotless and your skin isn't too dry.

I´m experienced the same problem of incorrect readings after a long time without use. I cleaned the rubber parts of the chest strap with soap and water, than I use some silicone grease or other silicon liquid to keep the rubber hydrated. Make a careful cleaning in the contact area between the rubber and the plastic parts, the fissure in these area use to be full of "sweat dust".