Kitchen mixer tap problem

It sounds like there's a fault with the tap itself. Have you tried feeling whether the pipe below the sink gets hot ? if it does then the problem is above. Just an idea. Maybe try changing the tap if you can do it or maybe there's a guarantee.

I had a similar problem which turned out to be the mixer tap allowing cold to flow into the hot through the internals of the mixer tap. Had to replace the tap. Try disconnecting(isolating) the cold from the tap and see if it runs hot then.

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Thank you Joe & Jim, In following your advice, I checked the flexible connecting pipes below the Kitchen tap, and although I made no adjustments to anything, I did 'waggle' said pipes about a bit, then set tap to run in 'hot' mode, and got the hottest water we've had since kitchen was fitted 18 months ago. This makes me wonder if there was some debris in there somehow restricting flow of hot water - time will tell, and if problem recurs then I'll take connections and flexible pipe apart to clean out. Thank you both again for your help

dfrog