@sanjeevver27557 look slike your videocon ac is actually a split air conditioner. The error code E5 is an indoor fan fault.
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@sanjeevver27557 looks like your videocon ac is actually a split air conditioner. The error code E5 is an indoor fan fault. This could be a failed indoor coil temp sensor as well as a bad fan. Since it is intermittent I would replace the sensor first
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Take a look at [https://www.youtube.com/watch?v=DUoXQyJgmws |this video] and see if it provides you with a resolution of this issue.
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While you work on your AC, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same problem as you do. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.