thanks for your reply pump was bled but still same problem when the pump was changed it was from a grundfos selectric 15-50 to a flowson, spec for both are the same ( but flowson cheaper) could this be the problem?hope you can help cheers
HI HOPE SOMEONE CAN HELP ME MY PROBLEM IS MY RADIATORS ARE WORKING UP STAIRS BUT NOT DOWN STAIRS THE PUMP IS OK BUT I HAVE NOTICED THAT THE RETURN PIPE TO BOILER IS COLD . IF YOU TURN OFF ALL UPSTAIR RADS THE ONES DOWN STAIRS DOES WORK APART FROM ONE COULD THE PROBLEM BE A BLOCKAGE IN THE RETURN PIP...