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Utica Condensing Boiler Question

Cheif Member Posts: 1
Just yesterday we installed a Utica 90% condensing  2 pipe direct vent gas {natural] hot water boiler. Nice unit and job went well On start up unit fired up first time and ran maybe 3-4 minutes. It shut off, then restarted by itself, then and now its retrying, firing briefly, shutting down, then after 2-3 trys will lock out on "valve" stage on the main controller  or ECM. Help!