Boiler burner light (green) keeps going out HELP

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The green indicator light for my burner on my Greenstar Ri boiler keeps going out after I switch on the central heating.

I have balanced all my radiators, bled all air from them, set my thermostat to a required temperature but each time I switch the heating on the burner indicator light initially lights up green but after 5 mins or so the burner and therefore the light go off.

Any suggestions would be much appreciated.
 
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Are the radiator valves all open?

Do they all get hot?

Tony
 
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Thank you for your replies....since my post I have found one radiator that wasn't heating up. The lock shield valve was fully open but when I removed the TVR valve and tapped the stick bit the hot water started coming through. I skso checked the pump and it seems to be running ok. Since I have sorted this last rad and completely bled all the air out it seems to have settled down and has been running for a few hours now. Do you think the system just needed settling down?
 
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