Arrived on site for a report of no hot water. Upon arrival, Jonathon explained the history of the unit and noted that multiple flat plate heat exchangers have been replaced over the past few years. Based on my initial evaluation, I suspected that the flat plate heat exchanger was plugged and restricting water flow on the domestic side. I removed the flat plate and found a significant amount of buildup inside. Testing confirmed that the domestic side of the heat exchanger was completely restricted. With customer approval, I replaced the flat plate heat exchanger, purged air from the system, and confirmed proper operation. The best course of action moving forward is to have one of our plumbers come out to assess and install appropriate filtration or water treatment options to prevent future buildup and damage to system components. System is operating properly at this time.
