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A trickle of hot water from taps, central heating ok

Water pressuse on cold tap ok, but trickle of hot water from boiler central heating seems ok (demand light goes on) but when tried topping up sealed system via valve on the flexi hose nothing happened, pliot light ok. worcester combi boiler

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  • Anonymous Mar 14, 2014

    My plumber seems to think it could be diverter valve keeps switching to radiators and hot water

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  • 332 Answers

It sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

Posted on May 29, 2009

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Posted on Jan 02, 2017

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I am not getting any hot water, only cold water, when I run my hot water taps. I have an Ariston Bravo water heater. Normally I have permanent hot water at any time. My central heating seems to be...


Sounds like the by-pass valve diaphragm. This valve detects that hot water is being drawn off at the tap and then diverts the mains input water across the heat exchanger. Very often it's the diaphragm inside the valve which is punctured or split.This can be replaced [depending on model] if you take apart the valve
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Re: combi boiler.


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1 Answer

Combi boiler no DHW


if the boiler fires when the tap is opened then the diverter valve is working ok it must be a blocked plate heat exchanger which is the stainless steel rectangular block inside the boiler connected to the pump and the mains cold water.
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