@Phaedrux Hi there, I have resolved the issue, the printer is 1mx1mx1m, we make custom car parts. Unfortunetly technical support for the printer is not available . I had to heat up the beds initially and run the Macros to clear faults, then ran both simultaneously.

@jay_s_uk Thankyou looks like when I increased D Value and then increased M570 values for the bed its working ok (less alarm faults). Still not perfect but much more manageable.
The AutoPID Tune M303 still faults out as it takes too long, is there anyway to change the timing on this? it is a large and thick bed, would you recommend manually setting the parameters?

How do I input the changes into G.code file or will the M500 function work to save on g.override?

Thankyou
Regards
Saad

Hi there, I've been battling with this issue for a while. I can work around it by resetting the temperature faults and getting to 80 degrees but this time consuming and I dont have the time to sit and wait for temps to go up. The bed still reaches 80 degrees and used to work automatically, all of a sudden it stopped working and get the faults. There are two heaters that work independently.
Error: Heater 0 fault: temperature rising much more slowly than the expected 0.02°C/sec.
I cannot run a tune as it times out.

The only change might of been when I changed the mother boards out and the firmware updated from 3.2 to 3.4?

Any help would be appreciated

Did anyone fix this issue? I am having the same issue with my large bed

@Phaedrux Hi there, I have resolved the issue, the printer is 1mx1mx1m, we make custom car parts. Unfortunetly technical support for the printer is not available . I had to heat up the beds initially and run the Macros to clear faults, then ran both simultaneously.

Hello,
I have a 15mm thick aluminum bed running two heaters, it was a slow process heating up prior.
But always hit temp. 85Degress C
I recently changed the stepper drivers and motherboard out as the other ones faulted.
The bed was still operational though.
Motherboard is and was Duet Mini 5+ with WIFI like for like replacement
RRF 3.2 to RRF3.4

Since the change it fixed my initial issue of the extruders not working, but now the beds wont heat up.
I get a message
"Error: Heater 0 fault: temperature rising too slowly: expected 0.12°C/sec measured 0.01°C/sec"
When I try and tune the beds independently I also get a fault
"Auto tune cancelled because target temperature was not reached" so I lowered the setpoint (50degrees) and tried the tune again.
Where I get
"Warning: Auto tune of heater 3 failed due to bad curve fit (R=0.251 K=3.910:0.000 D=3.42)"

The g.code is as follows

M950 H0 C"out1" T0 ; create bed heater output on out0 and map it to sensor 0
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 P0 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C

M950 H3 C"out2" T3 ; create bed heater output on out0 and map it to sensor 0
M308 S3 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 3 as thermistor on pin temp0
M307 H3 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 P1 H3 ; map heated bed to heater 0
M143 H3 S120 ; set temperature limit for heater 0 to 120C

Override is
M307 H0 R1.000 K0.543:0.000 D90.00 E1.00 S1.00 B0
M307 H1 R2.819 K0.612:0.000 D9.21 E1.00 S1.00 B0 V23.0
M307 H2 R2.834 K0.360:0.000 D5.51 E1.00 S1.00 B0 V23.2
M307 H3 R1.000 K0.543:0.000 D90.00 E1.00 S1.00 B0

So last error I got was the bad curve fit and im stuck on what to do next.
It is winter here, if that makes a difference. Chamber is around 10-12 degrees when cold.
Thankyou