Auto tune cancelled because target temperature was not reached

[adistr]

Hi,
I tried to automatically calibrate my heater that connected to Duet2Wifi (RepRap 3.4)
These are two heaters12V, 40W that connected to the same tool.
Of course, they are connected through an external power supply and through a mosfet.
When i try to auto tune i got the following error - "Auto tune cancelled because target temperature was not reached"

What am I doing wrong and how to do it right?

Thanks,
Adi

[gloomyandy]

@adistr What is the full command you are using to tune the heater? What happens? Do you see the heater temperature rising (maybe post a screenshot of the temperature graph just after the tuning fails). You should probably also post your config.g so folks can see how you have things set up.