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Quote: Originally posted by michael on 18/8/2013

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think the non return valve is not letting water through.to check this remove the drain plug outside and get someone to switch on the pump,if nrv is ok water will gush out.if nrv is faulty water will only trickle out.the descale can be done by filling with water and white wine vinegar.leave a few hours then flush out.

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Quote: Originally posted by kegonlegs on 18/8/2013

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Hi abigailsmum
could you tell me how you de-scaled the heater, because I to have the same symptoms.
Regards

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I used Truma Aquastar 1+2 which is not only a limescale remover but a discinfectant too. When I flushed the hot and cold water system through afterwards I was amazed just how many green bits arrived in the wash basin that were descaled from the hot water tank. It's worth doing about once every five years just to keep the heater element free of lime scale which in turn will heat the water quicker.

http://www.amazon.co.uk/TRUMA-AQUASTAR-1-2/dp/B006J7L8A4/ref=sr_1_1?ie=UTF8&qid=1377209603&sr=8-1&keywords=truma+Aquastar+1%2B2