What causes excess water in header tank?

[Jimmyjammy]

Hi all, I've got a problem with the central heating. Can anyone tell me why / what causes water to enter the header tank from the central heating.

The boiler is making lots of clanking noises. Is it the trapped air causing the water into the header tank?

Thanks for any answers.

Jim

 

[seco services]

faulty pump,sludge,blockage.
is the pump working ?

 

[Jimmyjammy]

Yes I think the pump is working. Although it was on setting number2. Last weekend put it on the 3 and then the 3amp fuse went in the fuse box by the boiler. Its a lifestyle LP241.

Someone did say it might be the pump. Also wonder if there is sediment in there as when I bleeded the radiators it was quite brown the water. (but its been a few months since last done it)

Thanks

 

[seco services]

whats the bottom of the f/e like ?

 

[Jimmyjammy]

When you say f/e do mean the tank in the loft? That's in good condition. But it is steaming up the loft and I'm worried about the damage it might cause.

 

[Jimmyjammy]

Someone said it might be the themostat is not working and this is causing the hot water to keep heating and the hot water excess is going into the other tank in the loft - does that make sense?

 

[gas4you]

Coil gone in HW cylinder?

 

[Jimmyjammy]

You might be on to something there. I tried a 3A fuse and it went 10 minutes later. I had the hot water on and the pump was red hot with slight 'plastic overheating' smell.

Does that mean the pump needs replacing?

 

[seco services]

somethings wrong with the pump if its blowing fuses.
may be seizing up

 

[Jimmyjammy]

Replaced pump (water had got into the electrics, it also looked rusted up). £80 and its OK except now and again, if the hot water is on too long, it makes a screeching almost siren sound! Someone said the pump was dried out?

Something to do with the small tank in the loft having a blocked pipe? They suggested banging the pipe where two pipes meet??? Can anyone explain what they mean?

Thanks for any help.

Jim

 

[JohnD]

try bleeding the highest radiator in the house and see if water squirts out forcefully.

how high is this rad compared to the pump?

 

[malkie]

Have you turned the heating off and vented system,its got to be off when you vent system also see if thetres a vent by cylinder it will be on the pipes (is your pump by the cylinder) have you bled the pump and is the tank emptying when you vent,can you hear the water filling when your venting system