Let me guess, you're beer's been in the bottle for less than three weeks, right?
The 3 weeks at 70 degrees, that we recommend is the minimum time it takes for average gravity beers to carbonate and condition. Higher grav beers take longer.
Stouts and porters have taken me between 6 and 8 weeks to carb up..I have a 1.090 Belgian strong that took three months to carb up.
Temp and gravity are the two factors that contribute to the time it takes to carb beer. But if a beer's not ready yet, or seems low carbed, and you added the right amount of sugar to it, then it's not stalled, it's just not time yet.
Everything you need to know about carbing and conditioning, can be found hereOf Patience and Bottle Conditioning. With emphasis on the word, "patience."
Whats funny, is this is the same recipe ive used for a year, only I used a blender in a pinch, and the beer seems less carbed. But it is green. Only 2 weeks