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I have been trying to repair the Trevi Therm shower I have at home. The shower only provides water when the temp control is above the 40°C temp override setting. If the temp is turned below that setting water ceases to flow. I have removed the thermostatic cartridge, which was silted...

I've had a good look through at the postings on the common problem of loss of hot water with the Alpha CB28 combi. Mine is 4 years old, no previous problems. I have the same problem as many of the other postings. ie; CH works fine but DHW is intermittent. It started to do this just before...