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Hi, I have a model that is a converted victorian villa, from residential to office. The building is naturally ventilated and has a boiler feeding a radiator system. I have modelled the building and system. It was running ok (ish) with a setpoint of 22'C when the system was on, 6'C when it was off, and it was running from 7am to 7pm. The heating system ran fine for the whole year with reasonable heating energy reported. When I changed the boiler and radiator system to 8am to 6pm the heating systems just shuts down in the middle of January, no flow through any of the boilers or radiators. I can't work out why it just suddenly stops. It is reporting unmet hours and not meeting setpoint anymore. Even stranger, when i put it back to the original settings it is still shutting down in the middle of January and only meeting the setback of 6'C, it doesn't reach the setpoint of 22'C at any time. Any thoughts would be greatly appreciated. many thanks! Annie