Left air pod showing red color exclamatory symbol

Hi yuvarajp, try following these steps:

1. Go to Settings > Bluetooth and hit the info icon next to your AirPods

2. Press Forget This Device

3. Open the lid of the AirPods case and press and hold the setup button on the back of the case until the light flashes amber (make sure your AirPods are in the case)

4. Reconnect the AirPods

Let me know if it helps!

If that did not work, I would make a Genius Bar reservation to explain the problem (it could be a hardware problem), in order to get the problem solved or the product replaced. Here's how:

Genius Bar Reservation and Apple Support Options - Apple