Lochnivar boiler keeps cycling

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Im in trouble. My boiler is basically power cycling, i have to manually reset the power to it and it will light and run for between 5-10 mins. Then it shutsdown and wont start back up. Ive replaced the thermostat board and a hvac guy changed the zone valve and cleaned the heat exchanger. But it is still doing it. Im at a loss this unit is 10 years old and basically brand new again at this point, minus the gas valve and auto ignition module. Any ideas ??? I can send video or pics if needed.

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    Sounds like the thermocouple, have you replaced that yet? I’ve included a sample picture.