@Phaedrux Well it seems to have worked this time. I might have used the wrong settings when i used the config tool. It does say this:
Warning: heater behaviour was not consistent during tuning
Auto tuning heater 0 completed after 3 idle and 25 tuning cycles in 2864 seconds. This heater needs the following M307 command:
M307 H0 R0.322 C440.5 D3.78 S1.00 V24.1
Send M500 to save this command in config-override.g
No errors when heating the bed so can I assume that things are all fine then?