When you have been doing these past checks – I assume you have got the pump board connected to the reactor too, right?
Beyond that, I am not sure at this point – it seems as if there may be a more serious fault in the hardware somewhere. It could be in either the control board or the reactor – with only one of each it is difficult to diagnose which is not working. Most likely there may just be a poorly soldered connection that is corrupting the electrical signals. The best approach would probably be to contact Labmaker and ask if they can replace it, they are usually very good at this.
Sorry to not be of more help!
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