[BUG] part cooling fan - speed not controllable after mesh-loading

[Nemesis01111]

Did you test the latest bugfix-2.0.x code?

Yes, and the problem still exists.

Bug Description

After reboot the part cooling fan works without problems - and its speed is controllable.
But after loading another previously safed mesh (100-point-UBL) the fan only runs, when the speed is set to 100%. At 99% and below it turns off.
I can reproduce the problem with setting the fan-speed direct via touchscreen or running a gcode-file. I tested this by using a "selfe-made" gcode-file, that only variate the fan speed.

I attached the gcode-file, Configuration.h and Configuration_adv.h.

If I go back to 2.0.9.2 or 2.0.9.1 the fan works as it should, without problems - so it seems to be no hardware issue.

Best regards,
Thomas
configuration.zip

Bug Timeline

new with 2.0.9.3

Expected behavior

The fan should be running at every defined speed.

Actual behavior

After loading a mesh, the fan only runs at 100% or 0%.

Steps to Reproduce

1. reeboot
2. only adjust the part-cooling-fan via touchscreen or LCD --> part-cooling-fan works fine
3. start a test-print --> part-cooling-fan works fine
4. go to UBL and load a previously safed mesh
5. try adjusting the fan-speed to 30% or so --> part-cooling-fan stays at 0%
6. try a test-print with 30% fan speed --> part-cooling-fan stays at 0%
7. if you adjust the fan-speed to 100% --> part-cooling-fan runs at 100%
8. reboot again and start again

Version of Marlin Firmware

2.0.9.3

Printer model

Sovol SV01

Electronics

my Mainboard = BTT Skr MINI E3 V2.0; my touchscreen = BTT TFT35

Add-ons

BL-Touch

Bed Leveling

UBL Bilinear mesh

Your Slicer

Cura

Host Software

No response

Additional information & file uploads

I changed this settings to the "stock-sovol-configuration":

Configuration.h:

#define X_BED_SIZE 285
#define Y_BED_SIZE 245
#define Z_MAX_POS 260
#define DEFAULT_MAX_ACCELERATION { 4000, 4000, 100, 1000 }
#define JUNCTION_DEVIATION_MM 0.035
#define S_CURVE_ACCELERATION
#define AUTO_BED_LEVELING_UBL
#define RESTORE_LEVELING_AFTER_G28
#define G26_MESH_VALIDATION
#define LCD_BED_LEVELING
#define MESH_EDIT_MENU
#define LEVEL_BED_CORNERS
#define LEVEL_CENTER_TOO

// Preheat Constants - Up to 5 are supported without changes
//
#define PREHEAT_1_LABEL "PLA"
#define PREHEAT_1_TEMP_HOTEND 200
#define PREHEAT_1_TEMP_BED 60
#define PREHEAT_1_TEMP_CHAMBER 35
#define PREHEAT_1_FAN_SPEED 0 // Value from 0 to 255

#define PREHEAT_2_LABEL "PLA+"
#define PREHEAT_2_TEMP_HOTEND 205
#define PREHEAT_2_TEMP_BED 60
#define PREHEAT_2_TEMP_CHAMBER 35
#define PREHEAT_2_FAN_SPEED 0 // Value from 0 to 255

#define PREHEAT_3_LABEL "ASA"
#define PREHEAT_3_TEMP_HOTEND 250
#define PREHEAT_3_TEMP_BED 110
#define PREHEAT_3_TEMP_CHAMBER 35
#define PREHEAT_3_FAN_SPEED 0 // Value from 0 to 255

#define PREHEAT_4_LABEL "TPU"
#define PREHEAT_4_TEMP_HOTEND 200
#define PREHEAT_4_TEMP_BED 60
#define PREHEAT_4_TEMP_CHAMBER 35
#define PREHEAT_4_FAN_SPEED 0 // Value from 0 to 255

#define SPEAKER
#define Z_SAFE_HOMING
//#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN // (deactivate!)
#define USE_PROBE_FOR_Z_HOMING
#define Z_MIN_PROBE_PIN 14 // (replace PIN 32 --> PIN 14)
#define BLTOUCH
#define Z_MIN_PROBE_REPEATABILITY_TEST
//#define MULTIPLE_PROBING 2 // (deactivate!)
#define NOZZLE_TO_PROBE_OFFSET { -33, 0, 0 } // (change values)
#define MESH_EDIT_GFX_OVERLAY // Display a graphics overlay while editing the mesh
#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 399.8, 412.2 } // (change values)

#define DEFAULT_Kp 34.9801
#define DEFAULT_Ki 4.2452
#define DEFAULT_Kd 72.0591

#define PIDTEMPBED

#define DEFAULT_bedKp 96.7552
#define DEFAULT_bedKi 17.0344
#define DEFAULT_bedKd 366.3798

#define SLIM_LCD_MENUS

// #define Z_PROBE_END_SCRIPT "G1 X173 Y125 F3000\nG1 Z0 F240" // (deactivate)

#define HEATER_0_MINTEMP -10
#define BED_MINTEMP -10

#define HEATER_0_MAXTEMP 315
(also change in TFT-config!: max_temp:T0:315 T1:275 T2:275 T3:275 T4:275 T5:275 BED:150 CHAMBER:60)

---

Configuration_adv.h:
#define BABYSTEP_ZPROBE_OFFSET
#define DOUBLECLICK_FOR_Z_BABYSTEPPING
#define BABYSTEP_ALWAYS_AVAILABLE
#define BABYSTEP_MULTIPLICATOR_Z 10 // (change from 1 to 10)
#define BABYSTEP_ZPROBE_GFX_OVERLAY
#define QUICK_HOME
#define EXPERIMENTAL_SCURVE
#define FILAMENT_LOAD_UNLOAD_GCODES
#define AUTO_REPORT_POSITION
#define M115_GEOMETRY_REPORT
#define AUTO_REPORT_SD_STATUS
#define SDCARD_CONNECTION ONBOARD // (change from LCD to ONBOARD)
#define HOST_ACTION_COMMANDS
#define HOST_PROMPT_SUPPORT
#define PARK_HEAD_ON_PAUSE
#define LIN_ADVANCE_K 0.12 // (change from 0.22 to 0.12)

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