Voltas — voltas ac service failure

I have the voltas 1.5 ton 3-star inverter split ac which has been malfunctioning for quite some time. It shows various error codes like h3, u5 etc. Authorized service providers have been unable to correct this problem. The ac is still in its service warranty period. It was purchased from reliance digital, rourkela.

Such kind of ineptitude is not expected from a well-established company like voltas. They are not responsive at all. If they are unable to repair the malfunctioning parts, they should promptly provide replacements.

I have attached a photograph for reference.