Timer Not Working

My Dacor Micirowave’s timer is not working properly. It dosen’t count down by the second it goes much much faster…to cook anything I have to put it on 90 minutes three times to even cook a baked patatoe. You can see it counting down very fast instead of by the second. Do I need a new timer?..this is a very expensive microwave that matches and sits above my Dacor Convection oven… it is located in a vacation property so the use has been only 20 to 30 times a year…if that?? Can you help?
Thank you,
Joyce Smith

This a duplicated thread.

Answered here: http://forum.appliancepartspros.com/microwave-repair/12220-timmer-not-working.html

Gene.