@engikeneer Okay, I hadn't found the M143 command. Let me try.

@stephen6309 But that's an impossible user interface design. Just cannot be in a commercial product.

@zapta Is this really the case? In the config file you set the extruder temperature limit to eg. 250°C, but then the user is allowed to use 250°C? Is it even possible to set limits in a slicer below the values allowed by the printer?

@t3p3tony The issue is that the user can set the bed to the maximum and then receive an error. Maybe until now nobody has gotten into this situation and I'm just experiencing it during testing.
It feels strange not allowing the maximum temperature. In a car you run against the rev limiter, but the engine doesn't require a restart.

@t3p3tony This is hardly a solution for a printer I professionally sell. And how can it be different from the previous three? I don't get it and want to know what is going on.
Maybe this all sounds a bit grumpy but after hours fiddling and customer pressure I'm not happy.

@t3p3tony The limit in the config is set to 90. Setting the temperature to 89 works fine. Only when the setting is identical to the limit, the fault occurs. Heater is strong enough, rises 60 degrees in a few minutes, and the curve is smooth. I've replaced the sensor and cabling, no change. Playing with the safety limits with the M570 command didn't seem to change behavior, not did it help.

@t3p3tony Ah of course. The "...x.x°C/s" type is displayed.
And I have made and sold three identical printers, where the problem never occurred. The same settings and config's. Only difference is maybe that we updated this last printer to firmware 2.05.1.

Sorry to bother with this topic again, but after days of testing I still keep getting heater errors when touching the limit of 90°C.

Heating up goes perfectly in a straight line to the max.. Any value below 90°C and the control works. Only at the max. the heater fault is called.

Changed the sensor and cable, ran autotune, checked previous versions that worked, but no progress.

The 1.800W bed is switched with a solid state relais.

Firmware is 2.05.1 (no time to change to 3.3)

Desperately trying to get the 16-bit program bmp2c-escher3d.exe to run on my 64-bit Windows, without luck so far.

Can someone compile it for me? Or is there a 32-bit version of the bmp2c-escher3d.exe program?

@dc42 The graph is very helpfull, but for longer prints I cannot babysit the printer.
For now I will try if better ground between power supply and heater block will improve the situation. And I will bypass / solder the E3D Molex connector, to eliminate a failure point.