the pressure will drop for 2 reasons either a leak on pipework, radiator or from the blow off outside easy way to findout if its the blow off if its not dripping try putting a balloon on it and see if it fills with water if its not then its in the house or under floor
123
November 2009
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
