[BUG] (Dummy Thermistor shows 0)

[destruct123]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

Marlin works fine.
But i can't set my dual extruder printer to my set value of extruder temperature. I'm currently running a clay printer on a SKR 3 EZ 5x TMC 5160. I need to set both extruders to 200ºC and the dummy thermistor just shows 0ºC.

Bug Timeline

No response

Expected behavior

Extruder's temperature as set on thermistor 999 value 200ºC

Actual behavior

Extruder temperatures shows 0ºC

Steps to Reproduce

Boot the printer.

Version of Marlin Firmware

2.1.2.1

Printer model

Custom

Electronics

SKR V3.0 EZ + 5 TMC5160 PRO

Add-ons

No response

Bed Leveling

None

Your Slicer

Cura

Host Software

None

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.
  Configuration.zip

Additional information & file uploads

No response

[thinkyhead]

Weird. Dummy Thermistor 999 should always show the temperature configured for it, as it uses a custom table. But perhaps the logic for reading the table has gone wonky. Is there an earlier version of Marlin where it works okay? We csn look at the differences in the thermistor handling since that time to figure out what change most likely broke it.

[ellensp]

Did a git bisect it says it broke on 03a4378

[ellensp]

'#define TEMP_SENSOR_0_IS_THERMISTOR 1' is missing, when it should be set as 998/999 is a thermistor table
Adding it back to 03a4378 and it works,
but on current bugfix the lcd does not start status screen
34e23bc revels a bug with thermistor type 998 ad 999 and _MINMAX_TEST

[ellensp]

A PR has been created to fix this

[github-actions]

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