Temperature rising too slowly

[Adam_Sw3]

Hi All, any thoughts on what to check for if I am receiving this error?

Heater 0 fault: temperature rising too slowly: expected 2.31°C/sec measured 0.32°C/sec

I had a previous board with the same wiring, etc but i keep getting this error?

BTW; I am using an AC bed heater using a Relay.

Thank you!

[dc42]

@Adam_Sw3 have you run M303 heater tuning on this bed heater?

If you have, what was the target temperature, and what temperature was reached when this error was reported? Also please report the M307 parameters you are using for this heater.

[Adam_Sw3]

@dc42 Hi, Yes I did originally, should I re run this? The target temperature is 40 degrees C and it got to about 30 before reporting that error. Therefore what I had to do was manually set temp to 35.... wait... hit 35 then change to 40 and then I would start printing.

M307 H0 B1 S1.00                               ; enable bang-bang mode for the bed heater and set PWM limit

Thank you!

[Phaedrux]

See here for tuning a heater.

https://docs.duet3d.com/en/User_manual/Connecting_hardware/Heaters_tuning

Be sure to save the results after running the M303 command to tune the heater, either with M500 to save it to config-override.g (and you must add M501 to the end of your config.g to load it at startup), or you must manually enter the resulting M307 command in your config.g