the pressure should be at no more than 1.5bar. check all your radiators for leaking, as this will cause pressure drop, and check to see if there is water dripping outside the building from the short pipe on the wall backing onto the boiler, if there is, the pressure relief SAFETY valve is faulty. the other cause is a ruptured expanion vessel inside the boiler( big red tank). get these checked out. there is ABSOLUTELY NO REASON for the landlord to to turn your water off, as central heating and water supply are on seperate sealed systems.
m
October 2008