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The Boiler was in Holloway, it was leaking from the diverter valve. The colour of the leaking water is so black like tar. I replaced this diverter valve with new one and advice the cliant to get the system power flushed. Go and see the next Video .. you will get a good idea of how bad the water is when I was draining the boiler.use Link :

If you need a boiler service or other plumbing or electrical problem we can help you. Please visit our Website www.unicuk.com to see if you are covered. If we operate within your area , call 02082008580 / 07974711639, or email info@unicuk.com There is no call out charge for our local areas listed : –
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