Checked first floor hearing system not functioning properly diagnosed compromised Grundfos circulating pump with supplies, hot water to the hydronic air handler Is compromised for proper operation recommend replacing circulating pump model number UPS15-58FRC please see photos for further details office personnel please follow up with the homeowner with a quote for the replacement of the pump View visual findings from this job here - https://visionshare.xoi.io/?id=XA-A243-F15DBA7E47C544F0A4466BF70026F000