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Hi, It only does this when the hot water is on, and the pressure rises, then it goes yellow when the dube burn comes on. It has never done this before! someone at a shop said it could be air getting into the system and my husband has found the fitting at the back of the pump is threaded and...

Hi Guys my celtic ff boiler is doing strange things... i know its ancient, but need it to last a little longer as cant afford to replace it just yet! It fires up on the heating, but builds pressure and then dumos all the water out the safety valve. We have taken the hose off to the...