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Combi boiler making hissing noise

Discussion in 'Plumbing and Central Heating' started by adamt11, 22 Jun 2020.

  1. adamt11

    adamt11

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    The initial problem was just a radiator that wasn't heating up properly, the technician fixed it in minutes by turning off all other radiators and tinkering with the radiator that wasn't heating up. He didn't go near the boiler.
    I wonder what could be causing this. I would like to turn off the water supply, but it's not clear where the stopcock is (none underneath the sink), one behind the washing machine another in the bathroom that could be it but they are completely stiff and I tried one in the airing cupboard but it doesn't stop the water so can't be that one.
     
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