I'm still battling my printer; after my last post I've received a new duet card since when everything's gone swimmingly, if slowly, until I hit the problem of the hot end heater shutting off.
I found Gregl's thread & sent the M301 H1 P20 I0.5 D100 command as Ian suggested.
This worked & both bed and hot end now hold temperature, so far 200 & 60 as suggested in the commisioning file.
However when trying to extrude I'm getting a message - "Warning: Tools can only be driven if their heaters temperatures are high!"
I can find nothing in the forum - it's obviously another parameter I can't find. The extruder works fine cold with M302 P1 command.
Advice would be welcome
regards
Richard