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Hi all, I have the common problem of heating working fine but hot water only warm. I know the usual places to look starting with the 3 port valve etc. However having changed the valve and flushed the system problem remains. What I have noticed and worked out is the motorised actuator at first...

My Oil boiler (Bubble) fires then fails within 5 seconds. However if I then reset the 'lock out' button (it is not locked out - the red light is still flashing intermittently) the boiler starts up and runs normally for the heating period on the timer. When it needs to restart at the next...