Hot water pressure problem on manual mixer shower.

[andymwilson]

Hot water pressure problem on manual mixer shower.
The house is 6 years old. Hot water pressure and temp is fine all over the house including the power shower in the bathroom, but the en-suite hot has suddenly become weaker, and if you put the shower head up, almost non existant. This does not affect the cold feed which is via the loft tank. Hot water feed is from the water tank in emersion cupboard. Water levels in the 2 header tanks in the loft are fine. Water in the loft header tanks is cold. Gas central heating system uses a Gloworm Ultimate wall hung gas boiler. Any ideas please?

 

[taydo]

the filter in the hot supply at entry point of shower

or if the shower is thermostatic the half cartridge and themostatic valve is failing or need re greasing