Worcester Bosch 24i RSF won't switch off ?

You would most likely have a faulty external control (timer/thermostat) or the flow switch is jammed on. Easy way to tell is turn down c/h dial to minimum, if it turns off then faulty external control. If it's still on then turn down the h/w dial to minimum, if it turns off (may not turn off immediately) then the h/w flow switch is jammed.

Ian
July 2009

As a short term solution, if boiler has 2 temperature dials on fascia, turn the one with the radiator symbol down to minimum or off position.

Andy
July 2009