My idnition indicator (yellow, two triangles on top of each other) flashes intermittently. It seems to be worse when I have the CH on - so i'm thinking it may have something to do with the divertor valve or the little microswitch on it? The servicing guide I have says that if this is flashing it shows a lack of water or poor water circulation in the central heating system. I have 1.5bar pressure in the central heating, and there does not appear to be any air in the system. Basically it all works, but about 3 or 4 times a day, this thing flashes and and resetting the boiler (power on/off) brings it back to life. Any ideas? The divertor valve was changed about 2 years ago (old one was leaking).