Hi,
* An ESP-12F is a tiny SMT mount module. Do you use it on a dev-board (which one exactly)or bare?
* it needs a power supply. Which one do you use? Wiring? Schematic? Bulk caoacitors?
* it needs some software. Which one exactly do you use?
* it needs one or more communication interfaces (WiFi, Uart, Spi, I2C...)
* it needs communication partners (PC, internet IoT server, display...)
* usually the communication partners need a software and a communication protocol
* maybe more
You see we miss a lot of informations, and each of the things above may cause problems.
Thus I recommend to upload a couple of (max 100kBytes) fotos of your setup (an overview foto and some detail fotos)
.. and give
* as much as possible informations mentioned above (a hand drawn sketch will help a lot)
* tell us how you test it, what resuls you expect and what results you get instead
Klaus