its low water pressure in the heating system. you will need to increase the pressure by filing it up through the filing loop.
heres a link on instructions to the boiler. and the codes for faults are on page 15
http://www.centralheating.co.uk/system/uploads/attachments/0000/2947/Britony_Combi_SE_Installation___Operating.pdf
kash
February 2015
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