On 24/02/2021 00:21, ss wrote:
I have a Digistat3 room thermostat, it is not connected to the central
heating but used as a stand alone thermometer just because it can :-)
it has worked ok for a few years but recently stuck at temp 34C.
Batteries are new and I have tried sticking it in the fridge but still
registers at 34C.
Not an issue if I have to bin it but is there anything to try before I
do that?

Sounds like it's had it. Only thing perhaps worth trying is to get into
"Installer Option" and see if anything there can unlock it. If that
doesn't work, and nothing else does, remember to remove the nearly-new
batteries before disposing of it,.

--

Jeff