HOW CAN I STOP WATER COMING OUT OF THE 15mm PIPE THAT GOES OUT SIDE FROM MY?
I HAVE A POTTERTON COMBI GAS BOILER THE 15mm PIPE THAT GOES OUTSIDE KEEPS LEAKING WATER AFTER CENTRAL HEATING SWITCH ON .THE PRESSURE DROPS WHEN C/H SWITCH ON AFTER AWHILE I HAVE TO REPRESSURE TO GET H/W THIS IS O/K BUT AS SOON AS C/H SWITCH ON WATER APPEARS TO LEAK OUT OF PIPE OUTSIDE IT ONLY HAPPENS WHEN C/H ON.