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This error is indicated when requesting for a dynamic simulation. The simulation cannot be started because of the 'unconnected boiler temperature'. The boiler still needs to be supplied with an appropriate set point setpoint temperature (e.g. heating curve).
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This base circuit indicates that the 'base circuit is not assigned to a zone' when requesting for a dynamic simulation. Currently, the software doesn't know in which building zone the radiator must drop its heat. Before running a simulation, the radiator must be assigned to the right zone (see building and loads library).