Another intermittent f and e overflowing

[Best]

Yes, if ballvalve is filling back to near overflow, then it is faulty, or fitted for too high level of water.
If it isn’t that, then must be blockage in feed pipe to heating, or split coil.
(If you are looking to see if coil is split, you will see the water coming up the feed of the f&e tank if you drain it first. Could be just a tiny amount though. Also test with heating running)

 

[Ted808]

Last job where the fault was intermittent the feed/expansion was blocked- check with a magnet near the T... opening the tap probably just diverts mains supply to taps and not f+e, by the time they stop running the tap the water level in f+e has seeped through the partial blockage... good luck - let us know how you get on.

 

[mikeygas]

What part ball valve is fitted I.e part 1 or part 2?

 

[armyash]

Thanks for all the replies, I had another look and spoke to them 2 days ago and they said it hasn't happened since. Weird.

 

[Ric2013]

Sorry if I'm teaching my grandmother how to suck eggs, but by the F+E, you DO mean the small cistern that is connected to the primary system (i.e. boiler and radiators)?

Out of curiosity, if the valves are new, why is the arm bent on the Part 2 valve?

 

[WaterTight]

Probably cos some yutz drilled the holes in the cistern at the wrong height meaning even set at it's lowest the level is too high.

I think the Pegler float valves have a longer vertical bit of arm which might be a good argument for having one of the van. For me though I'll just bend it a bit and get on with bigger problems.

"opening the tap probably just diverts mains supply to taps and not f+e, by the time they stop running the tap the water level in f+e has seeped through the partial blockage..." as said above sounds like the answer to the riddle of the tap appearing to have an effect