We have this boiler I have googled and can't find the answer to my question do IABU to post in this section but I need help. We recently had a new hot water heater fitted and new wall thermostats seemed to solve problem. Last night the boiler turned itself off no error code or flashing blue light like before, the pressure gauge is 1.5 so normal but the green digital numbers are high 70's and been that high all night even tho boiler is not in use, usually low 30's when not in use. What do these numbers mean? And is the boiler safe to use? There is ground frost here this morning. Thank you