uulag

Any ideas?  I have a Craftsman 536.88790 electric start snowthrower.  It started and ran fine all last winter and earlier in the summer when I started it.  Went to prep it for winter over the weekend and electric start "whirs", but motor doesn't start.  The motor does start with the hand crank.  I have a bad heart and am not supposed to use hand cranks, especially in the cold during winter.  One time on Saturday the electric start was able to start engine, but all the other times I"ve tried the past 2 days it only whirs, and doesn't start until I hadn crank.  Anyone have any ideas?  Thankx