Heatblock temperature measured too low?

[Trixxter]

Hello,

currently i have a strange temperature problem with my hotend.
After some successful prints i suddenly got a heater fault before the next print, mentioning that the temperature was rising too slow.

Wiring is ok, could not find any problems. After some more faults and new PID I reached the print temperature.
As soon as the print started it was obvious that something is wrong. Print was heavily stringy and the filament made cackling noises.
Managed to get a rough IR measurement on the heatblock at around 350C. Should have been 225.

At room temperature the thermistor shows the same value as the heat bed thermistor.
It is configured M305 P1 T100000 B4725 C0.0000000706 (e3d).

Just want to double check before I order a new thermistor, did not know this behaviour yet.

Thank you!

[Phaedrux]

It sounds like your thermistor is either loose or failing. Replace it and rerun the PID. Continuing to use it as is risks serious damage. 350c or more is no joke.