boiler cuts out shortly after firing up

[Johntheo5]

Can you post a photo of the cold feed and vent pipes where they connect into the pump, probably the 2 pipes to the right of the pump in last photo, above,

 

['aveagoJo]

excellent!
suggestions? fixable?
what might cause this?

 

[terryplumb]

Build up of magnetite in the pipework causing blockage. I assume you don't have a magnetic filter on your system?
Usual places are the first Tee,or elbow, on the cold Feed from F&E. Do you have a strong magnet by any chance ?
If so ,run it along the feed pipe, where it is attracted would be where the blockage is.

 

['aveagoJo]

 

['aveagoJo]

This is an old photo,
For your reference the pump is not currently on and I plan to turn down the speed.
Right, I'm off to find a magnet

 

[Johntheo5]

Yours may look like this, (your pump is pumping upwards so connection at bottom), after tying up the ballcock and syphoning out the water from the F&E tank, you can disconnect at the pump and maybe just poke a bit of wire through the blockage.

 

['aveagoJo]

Ok so I have used my magnet.
Not sticking to the feed pipe as far as I can tell.
But.
It is sticking to the pipe directly above, and leaving, the pump.
Also sticks to the horizontal pipe leading to the air release valve

 

[Johntheo5]

Assuming you have a upstairs if you open a rad vent/bleed then are you still getting water from it?, I would bleed off another 2 or3 litres of water to see if the ballcock starts making up water into the F&E Tank.
Have you changed the pump speed?

 

['aveagoJo]

Yes I do have an upstairs.
No water coming for the rads up here. I think a lot of water had left the system today.
Are you suggesting just bleed an individual rad?

 

[Johntheo5]

No, if no water coming from any/all one of the upstairs rads then proof enough I would think of a complete blockage

 

['aveagoJo]

Ouch!

 

[terryplumb]

Below your pump ,and to the right of it
,there appears to be 2 Tee's on the pipework show us a clearer pic of that and confirm that the magnet is not attracted to any of that section.

 

['aveagoJo]

 

['aveagoJo]

No the magnet is not sticking there

 

[terryplumb]

And the 2 vertical pipes in the last pic ,no magnet attracting to either of them ,all the way upwards ?
That horizontal pipe disappears towards the back ,away from the pump. How far does it go before it disappears ,and have you ran magnet along it ?