On Saturday, 14 March 2020 08:50:43 UTC, wrote:
Tim+ submitted this idea :
Fecking hell. How many time do I have to say that its NOT a thermocouple?
Ive owned and serviced this machine for 30 years now. I DO know the
difference.

Comments like that will deter people from helping you!

At 30 years, you have maybe had your monies worth out of it. Is the
probe damaged or broken, if not then perhaps the electronics have
failed.

I suspect the op knows more about this than you realise.