Homeowners recirculating pump had failed and the water pressure was 80 psi. Water pressure should be between 55-75 psi and the Pressure Reducing Valve had failed. Shut water off and replace the PRV with a new watts PRV. Removed the failed recirculating pump and installed the new Grundfos comfort pump. Installed pump into the recirculating inline and secured. Turned water on and set pressure to 65 psi. Purged air from the system and tested. Turned on the pump and set to Temperature + mode so the pump will activate when the water cools to a certain temperature. Everything is working properly properly at this time.