Combi boiler making hissing noise

Joined
29 Sep 2015
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United Kingdom
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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