ideal isar cuts out

[motherearth75]

when turning isar on the burner ignites and stays on for 30 seconds then cuts out and burner light flashes.
But if i turn on and off every time it trips out the radiator gradually warm up but stills trips out when warm.

 

[gas4you]

Check external controls are calling for heat and supply 240V to the switched live at the boiler first of all.

 

[motherearth75]

they are as i raised from 25 to 30 on roomtat and kicked in for 30 seconds