We are getting a F20 error ' over heat cut off activated' on our combi boiler. The symptoms are boiler starts for a few seconds, temperature increases rapidly to just below 100 degress - then get F20 - no central heating or hot water.
Have checked the pressure which is ok in green area and have reset boiler to no avail - any help please as we have a young family and not sure when an engineer can come out.
Have checked the pressure which is ok in green area and have reset boiler to no avail - any help please as we have a young family and not sure when an engineer can come out.