Heater extruder not heating at expected rate

I get this message: "Heater extruder not heating at expected rate See the 'verify_heater' section in docs/Config_Reference.md" I tried to follow the config_reference and put the values in printer.cfg, but now I get the message instantly when I heat hotend or do a PID calibration. Earlier it was just at random temperatures but I could reach target temperature by redo "target temperature" mutiple times (after reset firmware) - now it wont even start heating. What to do?
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