Hsein, Without seeing the project file it is not really possible to know what the problem might be. The problem might not be P_LOAD; you might look at how the other variables (Q_heating, Q_DHW, Q_cooling, m_H2, and LHV) are defined. If there are not connections to those variables or if those variables are not defined in other equations then you'd get the attached error. kind regards, David
On 05/24/2016 05:05, Hsein Moussawi via
TRNSYS-users wrote:
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