Thanks, the problem was with my firmware. I've tried a lot of Pronto Hex codes, but none of them worked. I've also put the puck as close to the air conditioner as possible. Firstly - as you can understand, it didn't work. Secondly, I had to rearrange it from time to time, since my air conditioner is often cleaned by airconservicing.or. I have even replaced the battery, even though I haven't any complaints about it. I just can't get how the firmware can literally disable my IR blaster. And why developers couldn't make stable firmware from the start.