Strange Problem with matra m8p V2.0 and QCL

[Keuning]

I Have a strange problem with QCL.
I explane i have upgrated my Voron 2.4 with a new manta m8p V2.0 board with a CB1 and with klipper on it, i had a octopus pro and the printer worked fine.
The printer also have a CAN bus system with a EBB SB2209 CAN V1.0（RP2040) and a tap for probing my bed.
The Can bus is connected with a CAN bus Expend board from Mellow.
Now if i do a QCL it works great it probes everywhere and it corrects the z axes good.
Now the strange thing is that when i switch my bed on and i do a QCL i get strange readings on the probe, al the values i get from the probe are not the same anymore, everytime it probes it gifs me a diverend values.
My bed is connected to HE1 and TH0 the bed it self is connected with a SSR relais, the bed heats up normaly.

So i do not know what the problem with QCL and my bed heating is. The powersupply is 24v 8.8A (LRS-200-24) it is the same one i used with the octopus board.

Is this a common problem, and is there somebody who knows how i can fix it.

I let my bed warm up before and waiting 10 min, than start QCL, only strange values, as soon i switch the bed off problem is gone.

 

[Mark Norris]

Are you heatsoaking the bed before QGL for like 30 minutes to allow for thermal expansion to settle?

 

[Keuning]

Are you heatsoaking the bed before QGL for like 30 minutes to allow for thermal expansion to settle?

It try to let the bed heat up, but nothing is changing, i can nog QCL the printer every time it probe the value is differend. As soon as i switch the bed off the values of the probe is ok en QCL goes like is needs to be.