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If I keep the water running the temp gets very very hot and when I switch the tap off the flame is still on and the water keeps heating and if the tap is still off the boiler starts to hiss and the steam comes out , if the water keeps running it almost gets boiling hot.

Thanks I'll check that

but why would it still overheat if we do not have the CH on only the water on

The radiator heats up only half way and it seems the water thats returning does not heat up.(its not the temp it should be)

its potterton combi 80 When I switch the boiler the water heats up ok and the heating starts as well but after some time there's a hissing sound and steam comes out from the top of the boiler. I checked the switch and thats working fine. So please help as we have no heating...

When I switch the boiler the water heats up ok and the heating starts as well but after some time there's a hissing sound and steam comes out from the top of the boiler. I checked the switch and thats working fine. So please help as we have no heating and no water thanks