Your boiler efficiency indicates you are modeling a Condensing Boiler. As such the CBECC simulation requires an Entering Water Temperature of 120 F or less. Based upon the combination of Boiler Capacity, Setpoint temperature for the Boiler Loop and Flowrate for the pump, the resulting EWT is above 120 F.
You can choose to change the boiler efficiency to a value of 85% or less and this check will be ignored. Alternatively at the Plant level of the Building Tree, Hot Water tab, lower the Boiler Capacity, Hot Water Pump Flowrate and/or the Loop Setpoint Temperature to result in an Entering Water Temperature of 120 F or less.
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