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poterson boiler?

when you run hot taps and then turn off. there is lot off banging in pipe work bubling noises as if air lock . its apotterson combi 80, please can you help thank you john.
j glasson, October 2008
sounds like a sticking water flow switch/wax capsule

corgi engineer reqd

stevie w, October 2008
link Click here to see other fixes for Poterson Combi 80.