Logic 30 Combi Hot water no central heating

Hello

Year old (last month boiler has started to play up, as stated above. The pressure had been to low and I was getting an F1 code. pressure is now good. Water is fine all working if I switch off the system then back on fan etc starts I hear the usual clicks and hum etc. Code c shows and after 5 secs or so the blue burner light comes on then approx 10 secs later it goes out. Code stays at c.

Any ideas guys please.

PS can anyone help with valve settings as my father in law tried turning these and now I'm not sure if i set them all correctly back again

The valves point upwards towards the boiler. Sounds like the boiler is firing but no circulation.

Sorted may thanks I also tried jiggling the diverter so perhaps an issue there too

Many thanks I now have heat