OTC sometimes reports the value as 16,777,214.00 °C

[Arise]

For some reason my Boiler reports the external probe temperature as: 16,777,214.00 °C. I think this happens when the external temperature is around value 0.

[Arise]

    float parse_f88(const unsigned long response) {
        unsigned int data = response & 0xffff;
        return (data & 0x8000) ? -(0x10000L - data) / 256.0f : data / 256.0f; 
    }

I think is not ok to store data variable in an unsigned int. Maybe we should use a unsigned short or uint16_t for that.