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    Potterton heatmax combi - dodgy hot water output.

    I have the Potterton Heatmax Combi boiler, and the HW is very iffy. Turn on a hot tap, and nothing happens Turn on heating, and then turn on a hot tap, and it has a bit of hot then cold then warm then cold constantly like that with each bit of HW lasting less than 2 seconds each time. The CH is...
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