This question is regarding Mira Excel/Select Thermostatic Cartridge - 903.33

Filter on hot water input blocked weekly by a substance

Pressure in shower drops to almost zero on hot temp. On removing cartridge the filter at the hot water side is blocked with a opaque substance / build up. Cleared with pointed object and wash then works. Currently needing to be done each week! Help?!
Asked 3 years ago by Conrad Trickett, Inchture Perthshire
This is a supply issue, and if you have a Mega Flow boiler , it could be the diaphragm in the boiler has broken down, and you will need to contact the manufacturer.

Answered 3 years ago by Barrie Seabright

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