Running water sound in attic but no leaks - help

[Win29]

Hi, just over the past day or so when my heating goes on there is the sound of running water in the attic. As soon as I switch the heating off it stops!

Only a few weeks ago I had to get the pump replaced on my boiler and I'm not sure if this would be related. I have checked the attic and there is no water running out / leaks but just sounds as if a bath is being run in the attic and can't work out where it is coming from. Any advice would be great or would it be best to contact a plumber?

 

[grajam247]

Hi there
Have a look in the small feed and expansion tank when the heating is on.It could just be the tank filling up.
regards
grajam247

 

[sooey]

It sounds like it's pumping over, could be that your new pump is set too high, try turning it down if it's a three speed one.

 

[blondini]

It does sound like it is 'pumping over'

Water that should just be circulating around the heating circuit is being pumped over through the vent pipe into the feed & expansion tank.
Almost certainly related to the pump replacement, it's speed may be set too high, it could even be pumping in the wrong direction.