Gurgling and air in central heating

[John.g]

Correct, but let us know when you do disconnect it if there is any dribble of water from it just now.

 

[jim843]

Correct, but let us know when you do disconnect it if there is any dribble of water from it just now.

Ok, just slackened it and yes there was a dribble of water.

I've left a container underneath to see if it keeps leaking...

 

[John.g]

Now remove it completely and if its still dribbling from the hose then that's your problem.

 

[jim843]

Now remove it completely and if its still dribbling from the hose then that's your problem.

I don't think it's leaking from the hose but the NRV appears to be leaking:

I watched it and I can see the water filling up and then leaking.

Could this be the issue?

 

[John.g]

I would't have thought so as difficult to see how this would pull in air so as one would expect the pressure to slowly decay with time, just leave the hose disconnected and see what happens to the pressure.

 

[jim843]

I would't have thought as difficult to see how this would pull in air so as one would expect the pressure to slowly decay with time, just leave the hose disconnected and see what happens to the pressure.

Ok, will do.

 

[jim843]

I would't have thought so as difficult to see how this would pull in air so as one would expect the pressure to slowly decay with time, just leave the hose disconnected and see what happens to the pressure.

So filling loop has been off since about 1400 (5 hours or so).

Pressure was at 2.5 a while ago. I heard some bubbling sound in bathroom rad. So bled rad again - few seconds of air - and now pressure is 2.4.

Still confused why the pressure drops when the pump comes on…

 

[Deleted member 123817]

The expansion vessel is normally teed into the pump suction so will rise by the generated pump head when it starts so if connected to the pump discharge will fall but when when off should return to the original pressure if water temp doesn't change,
Can you bring on the hot water very briefly say for 10 secs and then switch off and see if pressure returns to its original.

 

[jim843]

The expansion vessel is normally teed into the pump suction so will rise by the generated pump head when it starts so if connected to the pump discharge will fall but when when off should return to the original pressure if water temp doesn't change,
Can you bring on the hot water very briefly say for 10 secs and then switch off and see if pressure returns to its original.

Ok. Pressure drops slightly when hot water comes on.

I waited about 30seconds and then the pressure goes (more or less) back to what it was before.

 

[Deleted member 123817]

Was the new E.vessel installed internally in the boiler or is it external where you can see it!.