Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Hey @Sudhirrastogi62, a warm welcome to the Community.
Which light are you talking about, the heart rate sensor or the Blaze display? I recommend trying to restart your tracker by doing the following:
- Press and hold the back (left) and bottom buttons until you see the Fitbit logo on the screen. This should take less than 10 seconds.
- Let go of the buttons.
Let me know the outcome. 
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Those are great news @Sudhirrastogi62, I am glad to hear that the issue you were experiencing has been resolved. If you need anything else, do not hesitate to post it.
Keep the stepping up!
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