Recently our thermostatic shower has just been putting out luke-warm water, even when turned on to max. I've increased the combi-boiler water temperature but that doesn't make a different.
I took off the shower tap to expose the thermostatic cartridge and turned it counter-clockwise as far as it'll go, (it was already quite far around,) and now once re-assembled I get cold water when turned to cold and once I rotate the temperature around to hot I get very hot water for about 1 second before it returns to luke-warm again.
Hot taps elsewhere in the house are hot as expected.
Is this a faulty thermostatic cartridge?
Everything in this house is less than 1 year old, (including the boiler which also new,) so I don't really want to be paying £50 for a new cartridge that I would not expect to go faulty so soon in its life span, so I want to confirm if it's not something else in the house.