Hard to say. But these boilers should have a factory installed adjustable high limit aquastat that is adjustable. Think it comes default at 180 degrees but should not be adjusted above 200 degrees. The newer GWB models (with the inducer on the outside of boiler have the same aquastat but max setting is 190 degrees. Both aquastats should have differential dial to help with the short cycling. These boilers should operate on a thermostat of sorts. Thermostat would install on terminals P3-7 and P3-9. Could be a wall mounted thermostat if using boiler for radiant heating needs, or a well mounted thermostat to simply maintain water temperature.
An oversized boiler or low water flow through the boiler could cause the short cycling your experiencing. Would need to verify flow rate vs manufacturer's requirements. And also verify it is properly sized for the job.
These units are sensitive to high altitudes so they should be adjusted as per manufacture specifications.