Your Domestic Hot Water heater has an invalid Energy Factor. Select the Libraries button on the bottom left. In the list that appears above, select the DHW/Boiler library. You will see your water heater listed in the library.
Verify that you have the correct type of water heater selected (Gas Fired, Electric, Heat Pump, etc).
Now verify that you have a valid Energy Factor input for the water heater. EnergyPro will list the valid range of Energy Factors that you must conform to.
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