Have a fully pumped system with a three port valve. Rads getting hot when hot water only is selected. Have already changed three port valve. Please help - getting desperate !
Hot rads with hot water on
- Thread starter RWG
- Start date
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spot more info might help 
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kevplumb said:spot more info might help
Complete valve was changed this week. Fault occured overnight approximately one month ago - working fine until that point. System approximately 15-20 years old in microbore. Boiler is fan assisted. Anything else you need to know ?
Fan assisted? That's your problem then.
Paul Barker said:
What is happening with the fan ? - What do I need to do to correct ?
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