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Thanks Tony. I have descaled the thermostatic in the shower but am also getting the same problem in the bath tub and wash basin. Thats the reason why I eliminated the shower . The reason why I changed the diverter valve as I was advice by various plumbers as this is the common problem.

Hi I have the above boiler which was fitted 7 yrs ago. Last Christmas I had to replace the diverter valve. This year I am getting HW downstairs but the temperature fluctuates when using anything upstairs. I have CH up and down working fine. I have change the diverter valve. still same...