Shower going hot and cold.

9 Aug 2010
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United Kingdom
I have a Potterton Puma small combi boiler that's causing a few problems.

The tap in the kitchen takes ages to run hot, its just warm, even though the boiler is on the hot setting.

The shower (mixer tap) goes from hot to cold, i put the hot on full, then introduce the cold to a nice temp, 2 or 3 mins later, it goes from hot to cold, without the ability to control it with the taps, by introducing more or less cold water.

Pressure has been upped, as the house was empty for a while (upped on several occasions)

Could anyone help?
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