Heatbed shows wrong temperature.

tkln

Hello,

I have a silikon heat bed. I use the Duet 3 Main Board 6HC with 48V and run the bed with 230V+ SSR. Unfortunately, the system shows me the wrong temperature, it should show 22.7 °C but it shows 85.3 °C. My filament heater reads the correct temperature (22.7°C).

This is how I configured the heatbed: QWG-104F-3950

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B3950            ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                                      ; create bed heater output on out0 and map it to sensor 0
M307 H0 B1 S1.00                                        ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                                 ; map heated bed to heater 0
M143 H0 S120                                            ; set temperature limit for heater 0 to 120C

droftarts

@tkln said in Heatbed shows wrong temperature.:

M308 S0 P"temp0" Y"thermistor" T100000 B3950

Most likely your thermistor is a 10k ohm version, not 100k ohm. Take out one of the zeros in the T parameter. It would be best to get the thermistor specification from the manufacturer, so both the T and B parameter are correct for your thermistor.

Ian