The customer reported no domestic hot water, though the heating system continued to operate. I manually opened the zone valve, and the water heater began heating properly. After testing, I confirmed that the zone valve head had failed. This system utilizes a single circulator for both the heating and domestic hot water zones. The circulator is noisy and running hot. With the customer’s approval, I replaced the zone valve head and tested the system. I allowed the boiler to operate until the water heater reached temperature to ensure the new valve was closing and responding correctly to the call for heat. The system is operating properly at this time. The water heater connections are heavily rusted, and we strongly recommend replacement before a leak develops. Additionally, the burner motor on the boiler is very noisy and should be replaced to prevent future failure. I presented the customer with options for a new water heater, circulator replacement, and burner motor replacement. They
