Could anyone give me any advice on reducing pressure on my glow worm 30c boiler. I bled a radiator a few days ago and noticed the boiler had cut out due to low pressure. I tried to be careful filling it but ended up with pressure too high. I have taken loads of water out of radiator which works but it keeps going back up say half a bar (1.5 to 2) each day. I've had to take water out each day. As far as can see the plastic tap is off on the filling loop. Other than pressure getting too high the boilers working fine. The boilers less than 2 years old. Very grateful for any help.