furnace flame rollout???

hi all, today our gas fired boiler began cycling on & off; went to take a peek between cycles & noticed that the flame on the burners, once they lit were not 'burning' straight up, they did so for a few seconds, then settled back down into the burner box, and the furnace shut off. the furnace has a sticker on it indicating that it has 'flame rollout protection' and i guess this is what is shutting down the system. any ideas on what could be causing this?? it has an automatic damper & i checked it, it was open when the burners tried to light. i wondering if the burner ports or gas inlets into them could be blocked or dirty??? any info appreciated pax, h2

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h2
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Reply to
Tony Berlin

... thanx for the reply, understand that the rollout switch is a safety

Reply to
Tony Berlin

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