System shuts down afrer a few mins

[clayton]

Worcester-Bosch Greenstar 24Ri

Ive had to drain my system to fit a new radiator & now im having problems getting it going, the blue & green light come on the the fan spins then after a minute the green light goes out & the fan stops.

Any idea what i need to do to get the system working again, all the rads have been bled & drained water from the heat exchanger.

 

[namsag]

New Worcesters have a stupid self check on them after the power has been turned off one last for about 8 mins and one can last up to 15. and everytime you turn power off it starts again
During this time it will fire at half gas and turn its self on and off

 

[clayton]

Thanks for your replay, ive now got the centre blue light flashing fast