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When changing a washer on the kitchen tap we turned off the mains water supply from under the sink. However, when turning it back on we no longer have hot water in any taps and also no cold water in the shower or bath. Cold water in all sinks works fine.

Our system is gravity fed and it seems the tank in the loft is filling very slowely (only a drip).

Does anyone have any advice on what could be causing it and how to solve this?enter image description hereenter image description here

  • If it's gravity fed, how does the loft tank refill? – HazardousGlitch Jan 28 at 18:05
  • To be honest I’m not sure, my knowledge of plumbing is pretty limited. I know we have two tanks in the loft - one for radiators and one for hot water taps etc. The one for radiators seems ok but other is not filling up. Is there a way I can find out of loft tanks fill up? – Dcooke Jan 28 at 18:09
  • Are you sure you turned on all of the values you turned off? Are they quarter-turn values (meaning they only turn a quarter turn, 90 degrees) or are they full turn (where you turn it multiple times until it tightens)? – HazardousGlitch Jan 28 at 18:38
  • We only turned one valve, which was the one below the sink. It needed a multiple turns, over one full turn to get the water off. Then it was turned a similar amount back again. The cold water runs as it did previously (there is really strong pressure in the kitchen tap). – Dcooke Jan 28 at 18:40
  • You said "we turned off the mains water supply from under the sink". Is that the main cold water supply value for your home or just goes to the hot water valve on the sink? – HazardousGlitch Jan 28 at 19:20
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It seems your fill valve is stuck in the off position.

I don't have that particular type of valve but I'd try wiggling the moving parts (the blue parts probably) to see if that frees things up.

The instructions show how to check the valve and replace the seals.

diagram from user guide

I'd turn main stopcock off, pull that valve cover off, clean all moving parts up and replace them.

If still not working , you may have to turn off the water and replace the seals with new parts or replace the whole valve with a new unit.

  • How strong should the flow be / how quickly should it fill back up? I am wondering because it feels strange that it worked perfectly before we turned mains off then nothing afterwards. I’ve moved the blue elements of the valve and nothing happens. Want to make sure this is the problem before messing with it!! – Dcooke Jan 28 at 20:34
  • It should flow in about as fast as your kitchen sink cold tap. How long your tank takes to fill depends on how big it is of course. I've never timed it but I guess it might take 10-30 mins to refill from empty. – RedGrittyBrick Jan 28 at 20:37
  • It should be roughly the same flow that you see at the kitchen sink. You lose a little pressure with the extra height but that should be negligible. – CactusCake Jan 28 at 20:37
  • Ahh ok, definitely not flowing that well, a glorified trickle... I’ve been trying to research this and other forums suggest an airlock could be the problem for similar problems. Do you think this would explain what I’m seeing? – Dcooke Jan 28 at 20:38
  • That is a possibility. I would drain the whole system - shut off the house main and open all of the taps, let all the water run out. Then turn on the house main and wait for water to start flowing, close the taps from the lowest part of the house first, work your way up to the top. That should force all the air to the top of the system. Maybe have a buddy up in the attic keep jiggling the cistern valve to make sure the air is getting pushed out. You don't have to do it at full pressure either - that can rattle things around quite a bit when it's going from totally empty to full. – CactusCake Jan 28 at 20:48

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