Solved thanks !

Not sure why the initial M500 did not put the right values in the config overide .g.

M307 H0 A183.0 C1149.1 D7.0 S1.00 V12.2 B0

@dc42 said in Bed temperature rising much more slowly 1.8°C/sec:

verridd.g using M500.

Hi , Yes , I did that too
I am still getting :

Error: Heater 0 fault: temperature rising much more slowly than the expected 1.8°C/sec

Is there a way to disable the check of the 1.8degC/sec ?

@Phaedrux said in Bed temperature rising much more slowly 1.8°C/sec:

What is the thermistor?

Hello and thanks to all.
It is a bed from a Tronxy X5s.
The bed is power by a separated PSU 24V , driven by a Mosfet.
The PSU is configured to be 20V approximatively to have a current of 15A.
All wires are silicon coated wire 12AWG.
The mosfet is connected to the duet wifi , which is powered by a 12V PSU.
Thermistor is the one that came with the bed.

The thing is that it worked out of the box with RRF2.x .....
I did not change anything...so must be in the configuration....

Ok, I did M303 HO S60.
Results were added in the config.g with the M304 command.
I also changed the bangbang mode to PID in the M307 ...

and I still have the same issue...

Hello ,
I have a CORE XY with a 24V heated bed .
It was working correctly in RRF2.

After upgrading to RRF 3.1.1 now I have the following :
Error: Heater 0 fault: temperature rising much more slowly than the expected 1.8°C/sec

Any Idea ?
Extract of the config file below
Thanks a lot in advance.

Chris
-------------RRF 2.x configuration---------------
M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0
M143 H0 S120

-----------RRF3.1.1 configuration------------
; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat 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