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I had changed the dhw heat exchanger and that seems to have sorted the issue. Sorry I did not respond earlier...many thanks for your all help!

I have changed the heat exchanger and the safty value, now the DHW flow is as expected. All working fine now Thank you ALL for your help and advise!!!!!!!

Hi Jaynishriya, May sound like a silly question, where can I buy Citrix Acid or Fermox Restorer?

Appriciate your help, will let you know how I get on!!

OK will give that a try tomorrow, failing this what else could be the cause of the problem?

Thanks guys, I have already purchased a 'High Limit Thermostat' is that the same as DHW Themistor? Will try this first if not will try the Domestic Heat Exchanger any idea how much this would cost? Thanks again for you assistants!

Hi, I have a Vokera Linea 24 model boiler and recently seem to be getting problems whereby hot water is provided to the taps for a short period of time then it goes cold and the hot again and so on, the pressure bar is on 1.5 bar and central heating seems to be ok. Any ideas what is causing...