Yes, but I am only simulating January right now, so I do not think that's the problem.
Is the HW loop operating even in the summer season? You should avoid it.
If you are using Pipe:Adiabatic the problem will maybe be solved if you use an object that considers the heat losses through the pipes.
---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <alexmac_00@...> wrote:Dear users,I am getting an error saying that the water temperature in the HW plant loop is getting too far hot. I have read few other conversations on this topic, but I hope that you have some more tips.I believe that there is something wrong with the pump (constant speed) because I can easily solve this issue by replacing the constant speed pump with a variable speed pump. But theoretically it should also work with a constant speed pump with a on/off operation...any clue?