Harbor Breeze ceiling fan remote working excellent for control fan.
Light is on but not getting off from remote. What would be reason

Here are some replacement Harbor Breeze ceiling fan remotes (http://www.ceilingfanwebsite.com/Makes/Harbor_Breeze_Ceiling_Fans) located on this page.

It's also possible that your receiver is damaged (http://www.ceiling-fan-brands.com/ceiling-fan-remote-and-receiver-problems.php) as well. You can try reprogramming the remote too before you replace it.