Kitchen Tap lacking previous flow rate, needing help!

[benrandoll]

Hi all,
I replaced the tap washers in a bath and filled the hot water circuit back upagain (gravity hot water cylinder). I removed the airlock that was present and allhot water outlets were working fine. However, a day or so later the kitchen hottap, ONLY, has almost halved its flowrate/pressure. I’ve been back this eveningand put the water vac on the kitchen hot tap, and then up at the bath hot tap(trying to dislodge any blockage/partial blockage) however its exactly thesame.
I highly doubtthis is an airlock, as all the other hot outlets are putting out decent flowand pressure. My only theory now is that there is a blockage somewhere betweenthe first floor (where the cylinder is located) and the ground floor (where thesink is).

Any ideas atall as to what it could be, and how you fix it?!?

Thanks!
Ben

 

[plumb_know]

Tried taking spreader out the end of the tap spout? Isolation valves all open?

 

[benrandoll]

Yes I removed it and it had no effect. I took the tap apart completely to check for any sign of blockage but there was nothing. There aren't any isolation valves to the kitchen tap- it's a very old system...
It's still a mystery....

 

[leethegasman]

When you drained down there may have been dirt in the CWST which has possibly caused a blockage what was the condition of the cold water storage tank like.is there any insulation floating in there?

 

[benrandoll]

That is one thing I haven't checked..... However, if I do find that yes there are bits floating in the CWST, how can I fix the current blockage, and what can I do to prevent future blockages?
The system is very old, so I imagine that the tank is not properly sealed and dirt may have got in via the tank. I'll be back on Saturday to carry out more work and fix the current issue!
Thanks for your help!

 

[Toxic Ted]

If the tap has a diffuser on the outlet( makes the water look aerated) unscrew and clean out as its probably acting like a strainer catching the carp out of the tank when it was drained.

 

[WaterTight]

Ditto to above. And if you suspect it's that on a future job you're called to agree a minimum labour charge before even hinting you know the cure because no matter what the charge they're going to hate how quick the solution is.

 

[WaterTight]

If it's not that, take tap off, connect long flexi/similar to feed, run into bucket. You may see loads of rubbish come out. Had that before.