Plumbing Problems in the UK? Ask a Plumber Now.
I am presuming you have hot water?
I would think that you have either a faulty thermostat or the motorised valve has failed .
I doubt your log burner is getting the hallway up to 25 degrees or more causing the thermostat to switch off when you have turned it up
a flashing green light could mean you have a circulation problem. but that doesn't make much sense as you have hot water. its worth checking though if you can. the bif screw in the middle of the pump comes out and you should be able to see if the pump is spinning. You will need a small pot under it to catch a little water that comes out .