it needs a new p,r.v. or it may not b seating back properly try giving it a quick release to see if it will seat back properly its located under the pump a black knob with a red peg which u pull to front slightly to release pressure which goes to pipe outside
sean
October 2009
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.