Air lock in gravity system

[wlinton66]

I changed the pump and the three way port valve on a pumped gravity system. I filled the system (it took ages) and now have an air lock on the system, no water upstairs in the radiators. I've drained it down and tried to fill it again, it's even worse now. Would it be best to leave the system over night to sort itself out. Then go back and bleed the radiators.?Thanks will

 

[stevetheplumber]

yes often cure there selves over night so if its an option fine it definatelyt wont get worse and youll be fressh

 

[lame plumber]

then call in a plumber to sort it

 

[wlinton66]

There is an aerator on the system, would sludge in the aerator cause the system to fill up really slowly?

 

[Ch4 plumbing]

Sounds like you have a blocked cold feed.

 

[wlinton66]

Cold feed passing through aerator ?

 

[wlinton66]

Cold feed passing through aerator ?

 

[Ermintrude]

Get a magnet? If it's remotely attracted to the copper lump it's full of scale and mag.

 

[wlinton66]

It's a nightmare!! There is no air vent on hot water side. It has a three port valve fitted. It takes ages to fill and even then it the bottom radiators only that get filled. And then it stops dead. I noticed the header tank is 3/4 full also rather than 1/3 full. Obviously this could be adding to the problem

 

[Ermintrude]

Go home have a rest. Tomorrow, drain down. Fit vents replace air separator. Fill system with mains pressure to speed up, jam bit of 15mm speed fit into tank connector hook other end up to lever ball valve on cold. Keep filling till steady stream runs out of vent. ( test overflow first)

 

[wlinton66]

Will do, cheers for advice. Will

 

[lame plumber]

or fill via a doc on ground floor

 

[wlinton66]

Installed auto airvent, system sorted itself out over night, trouble getting the boiler to fire back up due to some air around the flow sensor in boiler, but after a few false starts , it sorted itself. Boiler was a Potterton promax HE. Thanks everyone will

 

[happyflyer]

Go home have a rest. Tomorrow, drain down. Fit vents replace air separator. Fill system with mains pressure to speed up, jam bit of 15mm speed fit into tank connector hook other end up to lever ball valve on cold. Keep filling till steady stream runs out of vent. ( test overflow first)

Ermi,

This sounds like a three handed job and the "go home and have a rest bit", Dr Ermintrude now is it, I will be Pm...ing you today with my personal problems, if you don't mind, I have this lump that's getting bigger !!!

Every time I drained my system at home got the same problem, decided to plank out the roof space, lifted the lagging and there it was the 15 mm CF from the FE tank running up to the elbow going into the cylinder cupboard, lifted the tank 50 mm problem solved an air lock waiting to happen, the plumber on drugs and trained at B&Q.