I have a ceiling fan that has operated for some time with a Hampton Bay remote. Now it doesn't and the light on the fan started flashing(blinking). Nothing else works. I replaced the batteries.

Try a different dip switch setting. If that doesn't work it is probably the receiver.

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