model 14944 is overboiling?

very little info what's the make where did you buy it and how long have you had it?
replacement it must be a recent purchase
other than that if still under warranty/guarantee then it's repair but only if it is proved a fault or you may get charged for any work. Some kettles do boil longer than you expect to ensure water hygene in risky countries.
Contact the shop or manufacturer see what they say.

B
October 2010