@fcwilt Brilliant, worked first time, I don't know how I missed that. I can auto tune and refine everything else now. Thank you for your interest.

@phaedrux No problems with connectivity until the second incident that left the empty config.g file .
The IP address changed from 192.168.1.11 to 192.168.1.9.

@phaedrux https:Thanks for your reply, The following is the data you require:
Board: Duet 2 WiFi (2WiFi)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.2 (2021-01-05)
Duet WiFi Server Version: 1.25
I understand that these type of problems can be extremely difficult to resolve, or indeed, replicate,
so please don't take my post as a crib, I'd just like to know what is causing it and in particular, is it due to something I've done inadvertently? Overall the board produces great prints and is streets ahead of the original 8 bit Chinese board

Re: Deleting config.g file
I've read some of the previous posts on this, as I've recently had the same problem when upgrading my Z probe.
The first time config.g deleted completely and the second, this evening, left an empty config.g, in both cases config.bak was available and renamed to config.g to resolve the problem, but this is a pain and a waste of time.
From my experience and what I've read on the forum, this has been an ongoing issue for some time now.
Has anyone come up with an explanation and/or a solution

while fitting a new fan to my Duet2:Wifi a wire tail dropped onto the board and shorted the 5v and 12v rails, after replacing the 2a fuse, the paneldue would not restart. Connecting a usb cable brought the panelfue to life, reading earlier posts I gather that a 5v regulator repair is tricky and a refurbished board might be a better option, are these boards still available?

@JoergS5 the missing M140 line was the problem, everything is running now. Thanks for your help

@fcwilt Brilliant, worked first time, I don't know how I missed that. I can auto tune and refine everything else now. Thank you for your interest.

@JoergS5 Corrected to this:
The sensor now displays but still no sign of the heater, what am I missing?

@JoergS5 Will do now. Just sorted the paneldue problem,
Missing config setting M575 P1 S1 B57600

I've just upgraded my Duet 2 to version 3.1.1 everything appears to be working except that the bed heater is not displaying on the Dashboard and my 7" Panel Duet (firmware v 1.24) is displaying all zeros

Here is the config.g file heater section!
Line 3 (M308 H0 C"bedheat") has also been tried with T0, T"Bed", T"bedheat" with no difference, Temperature panel on Dashboard shows three sensors :
ext0, Extruder0, Extruder1

Can anyone help?

@zapta Thanks for your interest, much appreciated,