It seems helluva old, but I just took the circle part off and tested the gauge by moving it with my hand and it worked! It seems like the cover part may not have been on correct and it was down at 0.
Thanks for all your help @CBW @gas112
Evening,
Does anyone have any solutions as to why my heating is not working on my baxi combi 105e? The hot water is working fine and when I go to switch the central heating on - nothing. I have bleed radiators and pressure is at 1bar. It's as if there's no signal when I call for heating - also...