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Radiant combi boiler put hot water tap on boiler fires up then goes out then lights up again and keeps on doing that

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Either defective sensors, or check the flow temperature going into the plate heat exchanger, if this getting very hot, but not circulating out the other side, it will probably be a blocked or restricted - replace

Posted on Mar 03, 2009

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Maybe the diverter valve motor is not working B&Q ~£12.

Posted on Dec 11, 2008

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when the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
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