When the heating is on, if you turn the hot water tap on the boiler makes a banging noise after which is ok until the next time you use the hot water. i have bled the radiators but this has not made any difference. It only makes this noise with the central heating running
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noise in water pipes is called water hammer and is when the water flow pulsates from an inconsistent flow. Water has mass and when stopped suddenly there is a pressure build up which moves any loose pipes. It can be fixed by putting more securing or mounting saddles on the pipe to hold it steady or you can get a pressure accumulator and it takes up the pressure build up and stops the noise. It is most prevalent when sudden stop taps are used such as ceramic taps or stop cocks and less so when you have to screw down the tap to shut off the water.
its getting to hot /either your water level is low in the system /the circulating pump coupler could be broken; so water may not be circulating through the pipes, this will cause relief valve to blow ..air may be in the lines also/let me know if you need more info/good luck/joe/
what does the pressure guage read it should be reading 12lbs at the lowest an 30 at the highest/the relief valve will blow at 32 lbs this depends on how many floors or levels you have ..
The movement of the diverter valve is critical on this appliance, and is located on rear right of the boiler, when hot water is turned on, theres are two microswitches, which must break (they both close in Central heating mode), if pump is running, it is recognising the hot water demand, check microswitches are breaking, if not, it tends to be a defective servo valve (located above the water valve), or a blocked/ restricted control line (small copper tubes which connect into the servo valve)
The fact that you're getting a little burst of domestic hot water suggests that the boiler is capable of circulating hot primary loop water through the heat exchanger, but doesn't necessarily do so when it needs to.
What seems to be lacking is a recognition that domestic hot water is now being drawn off, and that the boiler needs to fire up and divert the primary flow through the heat exchanger.
A good place to start might be the flow switch (usually in the bottom of the boiler, where the cold water supply comes in) or the electrical connections to it.