Combi Boiler overflow problem

Joined
4 Mar 2011
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United Kingdom
Hi guys

My boiler is working ok in terms of the heating and water working.

The pressure is fine in the boiler but there is a constant draining from the overflow on the boiler and therefor a constant filling up of the boiler and a constant use of gas as it keeps the temperature up.

Everything underneath seems fine.

There are two entry points for the water?

One has a red knob at the end
The other one a blue knob.

The blue one is fine but the red one is constantly leaking water out the overflow.

Both knobs move if I turn them quite freely about a quarter turn where nothing happens, and if I turn them any more than this (which requires a bit of effort) I hear water gushing I think into the system.

Everything seems to be the same from both but the blue one is releasing water badly.

Any help appreciated.
 

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