that might be ur problem.... i have cleaned mine out 3 times in the last 6 months and havent found a calcium build up problem on it.. also on my mag 9.5, everytime i shut it off and plug it back in it always kicks back on without hesitation... how old is ur pump?
I'll let you in on the secret. When you plug it in and it doesnt start up make sure its submerged in water and turn the pump upside down. Should start right up