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My first guess is that the Sizing:Plant object is set to 140F (default). When you tell the boiler to operate at 180F, it doesn't have enough capacity. I'd first run through the checks listed in this Answer. Or use the Measure that's linked to that Measure to do it automatically.

My first guess is that the Sizing:Plant object for the boiler loop is set to 140F (default). When you tell the boiler to operate at 180F, it doesn't have enough capacity. I'd first run through the checks listed in this Answer. Or use the Measure that's linked to that Measure to do it automatically.