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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.
I'd make sure the battery is perfect, or you power it via other means. The range is not very far, but I had difficulty capturing and replaying a signal with a poor battery. A new battery improved things.