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just had my return cleaned out as well as the boiler had a new main vent installed 3/4 inch I have a single pipe steam boiler with a honewell pressuretrol the main is at 1 1/2 psi the diff is at 1/2 psi and the boiler is still short cycling any Ideas one thing that concerns me is the location of the main vent it is ride before the drop on the return is that right ? the boiler runs fine for 10 to 15 minutes everything gets warm but then it shuts down and starts right back up again in less than 2 minutes and continues to do that goin Crazy here !!