Heatbed non stop heating

[timzok]

Hi

I have one A20m printer and I breaked my heatbed. With Geeetech support on Amazon, I buy a new one.
I plugged new heatbed and power on the printer, heatbed start to heat directly independently of temperatur setting.

Heatbed are not completly the same, the new one is version 1.1 and wires are not the same. On the new one, power is not provided by motherboard but by power suplly. I don't think it's related to this issue.

I saw a difference with the green and blue wire on the connector, it seem reversed.

Someone already connect this heatbed on a printer?

Thanks for your helps

[William]

Hi,If your hotbed starts to heat up when you turn on the printer, it is incorrect. You can try to unplug the hotbed cable from the motherboard and check whether the temperature display is -14 to determine whether the motherboard is normal.

[timzok]

Hi William,

I unplug cable from motherboard and temperatur is -14.

[William]

Hi,if you insert the hot bed into the temperature rise, the hot bed is not normal