The only one instance of component should be allowed

[GrKoR]

In the telegram chat:

Just FYI: I found my problem (CRC error on ESP8266 and packet timeout on ESP32). I accidentally defined two climate components in my config. And the competing instances catched the bytes/packets randomly.

climate:
- platform: aux_ac
name: "KISHAZAUX"
- platform: aux_ac
id: aux_id
uart_id: ac_uart_bus

(Link)