Problem adjusting reference altitude

[majestik666]

EDIT : Sorry posted in the wrong forum , posted it again in the observer forum....

I just got a brand new suunto observer and I cannot get the
reference altitude to be what I want ...
When I got the watch, the alti was displaying something close to 5000ft,
I live pretty much at sea level (coastal town) , so went to the setting
and tried to lower the altitude to 20ft which would be the real altitude
at which i'm at.
When lowering the altitude, it stops around 3500ft and displays "DEF"
and I cannot go any lower ... ?

Is there something else I should do ?

Thanks a lot !

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	Suunto Observer - Click for more info The shock-resistant Suunto Observer is a tool built for outdoor challenges, but its timeless design makes it wearable in any situation. The Observer is 1/3 smaller in both diameter and width than the first generation Suunto Watches (Vector, Altimax, etc). It also features a chronograph, which previously was only offered in the Navitech but is now discontinued.