I've been printing for a bit over 6mo with zero problems using a CR-10S4 with an E3D Volcano, 24V power, and a PT100 for my temp sensor on the hotend. I had this all working perfectly and two days ago the Duet2Wifi web interface started showing 2000C for the hotend temperature. I figured the PT100 might have issues, or maybe the cable is bad. I re-wired it, no luck. I changed the PT100 for the stock thermistor that ships with the E3D (connected in temp sensor port E1), reconfigured for the thermistor, and still showing 2000C. Not sure what the problem is.
Here's the relevant bits of config:
M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S120 ; Set temperature limit for heater 0 to 120C
;M305 P1 X200 R395 ; Set PT100 + ADC parameters for heater 1 (BROKE?, USING THERMISTER BELOW)
M305 P1 T100000 B4388 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S280 ; Set temperature limit for heater 1 to 280C
M563 P0 D0 H1 F1:2 ; Define tool 0 - use extruder 0, heater 1, fan 1, and fan 2
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
Not sure what I am doing wrong Is there something I am missing? What could be causing this?