Flashing L AND 3 No Water Flow

  • Check that the water pressure to the boiler is at 1 to 1.5 BAR.
  • Check that the yellow gas isolation valve under the boiler hasn't been turned off. If it is on, the handle/knob will be in pointing in the direction of the pipe
  • Turn the boiler off and bleed/let out the air of your radiators. Ensure the boiler pressure is still between 1 bar to 1.5 bar and turn the boiler back on
  • Press the reset button
  • If this does not fix the problem, please contact us quoting error code L3

View our video on how to top up your boiler pressure: