Please I need help with Phaetus Rapido 2.0 Plus UHF hotend.

have mounted a 500mm RatRig V3.1 with Phaetus Rapido 2.0 Plus UHF hotend and the problem I have is with the thermistor which indicates a temperature of 159 degrees when the machine is just started, but if I put a thermistor from an Artillillery it tells me the temperature correctly if I put a Thermistor of a Qidi machine also rises to 159 degrees. I have followed all the assembly steps and I don't know where I could have the problem
I have installed a new Octopus Pulpo V1.1 and it is still the same
Thank you for your help and sorry if my language is not very good, I am from Spain