@cncmaker said in another spurious heater issue:

m303 h1 s240

That's for tuning as a heater. M303 T0 S240 would tune it as a tool including the cooling fan.

@cncmaker said in another spurious heater issue:

I dont know if i should start a new thread but id like to ask you about another issue im having.

Yes best to create a new thread.