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one of the showers is only 3 months old - could the cartridge be faulty so quickly? Have just done some testing and the gauge on the prv is reading 5bar with no load - if I turn a hot tap on the boiler kicks in it shoots up to 9.5bar....

no, used to be fine have a feeling the pressure reducing valve on the mains feed might be broken?

Hi, I am having a problem with both thermostatic mixer showers in my house. Both run cold\luke warm when used. If i turn on the hot tap the water comes out boiling. Mains pressure is good, and i have 1.5bar indicated on the boiler. The only way I can get the showers to work...