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Further to last message, plumber has diagnosed failed gas valve which is either not opening or if it does, not shutting off. This is why burners keep going after all else is switched off. As boiler is about 20 yrs old, have opted for a new one. Hopefully, a trouble free heating system will...

Header tank is full so not sure it is that unless there is some sort of blockage (sludged up??). Strangest thing is that once the boiler fires up, it seems very reluctant to switch off, even if the HW & CH is switched off at the controller and the boiler thermostat turned to off. Last night...

Yesterday, with HW & CH on, hot water cylinder suddenly making a huge racket with banging, hissing and vibrations and generally sounding quite scary! Radiators were also extremely hot. Went to switch CH & HW off at timeswitch but boiler and boiler burner kept running -ended up switching boiler...