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Timex Helix ABT.
This watch calculates altitude by measuring air pressure and relating that value to the international standard atmosphere. 1013.25 mb = 0 metres.
The Timex ABT does not display negative altitude values. So if the measured air pressure is greater than 1013.25 mb and the altimeter is reset (select altimeter, pull out the crown 1 click and press and hold the lower left button) the watch will display LO. You can experiment with this. Wait till the barometer reads 1013 or 1012 and reset the altimeter. The watch will display zero or maybe 5 metres. Or wait till the pressure goes up to, say, 1022 and reset the altimeter. The watch will read LO again. If this happens alot, you probably live fairly close to sea level. What you can do to trick the watch is use a vacuum cleaner to raise the perceived altitude of the watch then calibrate the altimeter (pull out and rotate the crown) and change the altimeter reading to, say, 200 metres. It wont read LO then. Keep an eye on it and the atmospheric pressure. If the pressure starts to rise then adjust the altimeter accordingly. Remember this watch is designed to measure proper altitudes where the air pressure isnt likely to be as high as 1013.25. If you are mooching around near sea level the naturally changing air pressure will often make the watch read LO.
If you live up in Montana at 1500 metres (ISA standard pressure about 840 mb) all the time then the watch will always read a positive value and you can calibrate it from reference to a map or road sign etc. The atmospheric pressure will unlikely reach as high as 1013 up there and the watch wont read LO.

http://www.timex.com/info/Product_Instruction_Guides_Downloads

There are two ways to find the user manual for your Timex watch.

1. Find your watch on the list below and click on the language link for your manual.

2. Find the 3-digit module number located on the caseback of most Timex products and click on the corresponding language link for that number in the Module Table at the bottom of the page.

http://assets.timex.com/user_guides/W215_M179/W215_M179_NA_EN.pdf ??

Thank you for contacting FixYa.<br /> Im sorry, but you will have to send into Timex to get this repair. This is not a repair that a novice can do,<br /> I did find you a link to a repair site in UK. Best regards. Jewel<br /> <a href="http://www.timex.co.uk/contact_us.aspx">http://www.timex.co.uk/contact_us.aspx</a>

mcdevito75 here, Look for a small watch repair shop in your area, to save on costs, new band and labor.

May I get the make and model # of the watch to help you more

http://www.timex.com/info/Product_Instruction_Guides_Downloads

Use the numbers on the back of your watch and you will have a PDF version of your instruction manual.

Hope this tip helps
R/
David

Altimeters on watches are usually based on barometric pressure, since the pressure changes all the time you generally need to adjust the altimeter to a known altitude. You can look on USGS website to find the altitude of your area, or simply type in "altitude of city, state" in a search engine.
I hope I understood your question; if not, please reply.

You can attempt to have the circuit board reset if it has an "AC". This may or may not fix the problem. Usually when a sound board goes out you have to replace the whole circuit board or movement.

Timex stores are the only place I have been able to find their straps consistently. If you have a standard lug set up you might be able to get a similar after market strap at your local repair shop.

For Timex locations visit their web site...
Timex.Com

call 1-800-448-4639, give them the watch model number. Band will cost about $10.00