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is the blower running? and was the filter plugged?
Ok the blower not running is a concern..is there a fan "on" switch that you have tried?
Open limit is high temp cut out switch on the front wall of the furnace above oil gun. If it overheated due to no blower it could trip.
Most oil burners have a fan/limit switch on front wall with a manual push/pull knob for fan.
Or is this a boiler with combustion fan?
Ok so you have radiators that heat or registers that blow hot air?
Do you still need help?