Joined: 30/6/2002 Diamond Member 
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this is the time of the year a lot of carver 2 heaters develop NRV problems (non return valve ) a small amount of frozen water pushes the valve into the pipe causing blocking.if you cannot get and hot water taps to flow after filling up,this is the most likely cause.even draining off fully will prevent all ALL problems as the small bit of water left can not be seen.
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the only silly question is the one you do not ask.
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Topic: freeze up
