Keston Combi C55 boiler lockingout over and over again

Hi Guys,

My two years old Keston Combi C55 boiler lockouts repeatedly. I am unable to understand the reason behind it. Due to this, the boiler is not working properly. Someone please tell me the ways of rectifying this problem?



Hi Rafael,

Your boiler is not having a required amount of pressure. When you set the pressure settings of your boiler quite low as compare to the recommended pressure then, the boiler cannot work in a way, as it should be. For this, you have to increase the pressure with the help of the filling loop. Afterwards, reset your Keston combi boiler. Lastly, do check for the drips in the below-mentioned parts of your boiler:

  1. Towel bars
  2. Expansion vessel
  3. Radiators
  4. Pipework
  5. Radiator controller