getting an error coming up on my creality ender 6 . ive upgraded the board to stm32 board and using rep rap firmware and have a error message "bed heating less than 1.5 degree/sec" coming up when i go to heat the bed. does this mean my beds faulty. temp sensor seems to be reading correctly.
bed temp starts at ambient and slowly rises about 5 degrees when the error occurs.

If you run M303 heater tuning on the bed heater, that should fix it. RepRapFirmware uses the heater tuning results to set its expectation of how fast it should heat up.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].