@e4d I suspect that one of the sensors may have a short circuit between the wire that is connected to VSSA and something else, such as adjacent metalwork.

@sm180 said in Duet 0.6 temp problem:

@droftarts My Duet appears like a "1k ohm" type - resistor R21 and R19 are marked "01b".
20220406_093127 (1).jpg

....so I have to change the R4700 value! For 1k ohm Duet is it "R1000"?

Ok, I put "R1000" in config.g and..... IT WORKS!!!!
Thanks to the forum and nice printing !

Most likely you have an incorrect R parameter in the M305 or M308 commands in config.g. Simplest is to remove the R parameter completely, because the firmware knows the correct value for your Duet.

User error.
Not to make excuses, but my eye sight close up is not what it used to be. Thinking that E6 is Thermistor 6 , after looking at the board layout online I notice that E6 is Thermistor 7 not 6.
So now I have the coolant thermistor plugged into E(5) Thermistor(6) and my code is:

M305 P106 X6 T10000 B3950 R4700 H0 L0 S"Coolent Temperature"