your thirmister may be topping out and not changing, the firmware sees this as an issue (which it is)
most are around the -50~300c range
For higher temps you need a pt100 or a thermocouple...
It may have even been damaged by going to 295... so it now just stops reading at 260..
Edited 1 time(s). Last edit at 08/17/2017 08:07AM by Dust.