I have 3 heat pumps that go off on high head pressure only in the hot summer months. Not sure why this happens. Has anyone had this happen on other systems. Here are the Model#s.
• GPU-1 Model No. -TTH026AGS40ELPS Serial No. - L13781181
• GPU-2 Model No. -TSHO18BGS40ELWS Serial No. - L13781140
• GPU-3 Model No. -TTH026AGS40ELPS Serial No. - L13781180
The system has pumps individual pumps for each unit on the loop. There is a well field for the system. The system works fine all year untill the outside air reaches 90degrees or higher.