Save and exit, then build:
[fan] pin: PH3
cd ~/ cd klipper make menuconfig Set the following options exactly: mks gen v1.4 klipper
[heater_bed] heater_pin: PH4 sensor_type: EPCOS 100K B57560G104F sensor_pin: PK6 control: pid pid_Kp: 70.0 pid_Ki: 1.5 pid_Kd: 800 min_temp: 0 max_temp: 110 Save and exit, then build: [fan] pin: PH3