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My boiler has had an intermittent D1 code for some time, numerous parts replaced, condence trap, condense assembley, condence sensor, and a sensor (black thing) that fits onto the fan, all since May to no avail. But yesterday I noticed that when the boiler fires up, the red light flashes once...

This boiler has been the bane of my life since it was first installed in 2005. Recently it has been the D1 code. Engineers have replaced the condencing trap, sensor, pipe, main heat exchanger, gas valve, and also a very big expensive part (£700) which is another type of heat exchanger located...

I am new here, but I have a vokera boiler that keeps flashing a D1 error code, engineer took the pipe out of the boiler itself and cleaned it, it was full of black dirt. Was working ok but now the D1 code is flashing again, I leave the boiler off, turn to reset and it works again, however on...