it means power has been off, possible if power cut - it should go after about 30 mins.
my cdi30 did it when the batteries went in therm and boiler was off and needed a reset been assured by mate who works for british gas it should sort itself out after a certain amount of time.
w rooney
February 2010
Its a syphon fill mode after power has been switched off then on again,should only last a couple of minutes
Dave Cope
November 2009
i believe its filling its trap.
x
November 2009
I can answer this question...
my 30 cdi worcester boiler is flashing -| |- this symbol what is it ?