Looking for a replacement capacitor

Hi, the timer on my heating hast stopped running, its a mechanical driven by a small motor conected to 230Vac, the problem is a capacitor (the only other component) that is in series with the motor. I shorted the cap with a multimeter and the motor started running again.

The cap has the following info printed on it:

.1/10

What should I use as a replacement? What is the value exactly .1uF/10? Which I assume is 10nF, true?

What exectly is the cap for?

Cheers Brian