water overflowing from F+E

[dholi85]

System layout below, pumped open vented heating system. heating is working well, all the rads are hot.


I've got a few questions I hope someone can help me clarify.

1)Is this a Fully pumped heating and hot water?

current problem;

- Water overflowing from tank in the loft
- Boiler switching on and off every 5mins or so.
- hot water not coming out instant, only luke warm but takes a min or two of running water.

What could the problem be?, i was thinking possible zone valve fault/blockage or slow running pump?

 

[PlumbBobBob]

pumped heating gravity hot water

 

[EPH]

You've got a ***** in the hot water cylinder, common fault on that system.

 

[Simon F]

if you have a 3 port valve that would suggest a fully pumped system.
however if the diagram is accurate, then its a fully pumped nothing (the diagram is wrong)

Is the pump and 3 port in the airing cupboard, close to the hot water cylinder??
if the radiators are all hot that suggests the pump is not the problem.
either some restriction to flow through the coil, crusted gate valve (flow restrictor)
fault with 3 port (more likely to fail for heating)
faulty cylinder stat.
faulty programmer etc

 

[dholi85]

if you have a 3 port valve that would suggest a fully pumped system.
however if the diagram is accurate, then its a fully pumped nothing (the diagram is wrong)

Is the pump and 3 port in the airing cupboard, close to the hot water cylinder??
if the radiators are all hot that suggests the pump is not the problem.
either some restriction to flow through the coil, crusted gate valve (flow restrictor)
fault with 3 port (more likely to fail for heating)
faulty cylinder stat.
faulty programmer etc

It was a 3 port zone valve.

The diagram could be a little wrong as i drew it from memory.

yes the pump and 3 port are both in the airing cupboard close to the cylinder.

Which one could cause the system to overheat? As the pump gets burning hot and I can't touch it, same with some of the pipe work in the airing cupboard.

Another thing that i noticed was that the bleed key on the pipe work above the zone valve doesn't release any water or air, suggesting faulty zone valve or blockage.

Thanks for the response guys

 

[Simon F]

when you say overflowing, do you mean pumping over?
could be a restriction at the neutral point, test with a magnet.
pump could be gone, but you said heating is ok??

 

[Ermintrude]

when you say overflowing, do you mean pumping over?
could be a restriction at the neutral point, test with a magnet.
pump could be gone, but you said heating is ok??

No air or water, vents blocked and pump is dry? Cut off vent and fit an auto vent with ISo in male iron so easy to change.

Diagram looks like system will never work? Think u were thinking about ***** in tank instead of how the water was ever going to flow?

 

[GasmanxxxR1]

Blocked cold feed is the problem

 

[dholi85]

Found a picture of the setup.

 

[cr0ft]

You've got a ***** in the hot water cylinder, common fault on that system.

OMG that was brill. LOL.

 

[Ray Stafford]

OMG that was brill. LOL.

^^^^^^^ditto

 

[galaxy_plumbing]

maybe a blockage sort of as mentioned, put the heating on and follow pipe from the boiler until you fell the pipe hot

 

[Ermintrude]

Hot water draw off is vertical above cylinder? It looks a bit of a mess. Why didn't they just fit pump at top of expansion and put the 3 port in the cylinder??

 

[EPH]

Hot water draw off is vertical above cylinder? It looks a bit of a mess. Why didn't they just fit pump at top of expansion and put the 3 port in the cylinder??

I agree with. The pump position, by far the easiest way to get air out the flow and return from the boiler that way, just stop and start the pump and its clear after a few attempts, and lets face it, can be a pig of a job.

But yeh, mid position could be better.

 

[Gray0689]

maybe a blockage sort of as mentioned, put the heating on and follow pipe from the boiler until you fell the pipe hot

A blockage in your ***** be hard to get rid of lol