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Bathroom basin
All OK when it's first turned on but gradually over 60 seconds or so the flow rate reduces to a trickle
All other taps in the house OK
what kind of tap? old fashion pillar (turn handle loads of times) or a modern ceramic valve (1/4-1/2 turns to open or close)? Mixer or single supply?
If washer type tap they can sometimes expand when the hot water comes through and flow reduces.
Old fashion pillar type
Maybe an airblock? Had this in my kitchen tap. Opened upstairs hot tap and forced cold water through hot feed to get rid of it.
Sounds like an airlock.
If you have a kitchen mixer, try forcing cold up the hot side of the tap, with the upstairs hot tap open.
Sorry I'm being thick but how do you force cold water through the hot tap?
Are any of the other hot taps showing any signs of doing the same, even if it's just a slight reduction in flow?
Hot water cylinder? Airlock ^^^
Combi boiler? Faulty tap??
Several online guides via google
Yep, mine only does that when the HW cylinder needs draining and 'recharging' - 5 minute job normally (only applies to mains pressure type cylinders).
But in those situations it affects all the taps to some degree, although one (which requires higher pressure to work) does reduce to a trickle.
Sorry I'm being thick but how do you force cold water through the hot tap?
Do.you have a kitchen mixer tap?
If you have a mixer anywhere in the house, put your palm over the spout tightly, open the hot and then open the cold to use the mains cold water pressure back up the hot supply.
We have a lots-of-turns mixer tap in our utility room that does the same thing; I thought it was a plastic washer expanding when the hot water comes through. It's just a fairly cheap tap, ones with ceramic washers don't do it.
Ours is a combi boiler, there's no air in it.
Make sure you don't have a pressure compensator on the system - it needs to read 3bat when the tap furthest from the system is open and running.