My son installed our ceiling fan which has been working fine for about 3 months. Now none of the lights will come on. The fan part works OK. Is there a fuse just for the lights?

Is it a remote fan?

No - just the 2 pulls - one for fan and one for the lights. It has 4 lights, and you can have lights 1 and 3 or 2 and 4 or all 4 on.

Either a bad connection or a bad pullchain. Check the wiring. See:

General ceiling fan troubleshooting and help FAQ- Ceiling Fans N More (http://www.ceiling-fans-n-more.com/ceiling-fan-general-troubleshooting-and-FAQ.php)