Customer reported that a supplier had previously inspected the upstairs heating zone, which was not producing heat, and suspected the zone may have been frozen. Upon inspection of the crawlspace, both heating pipes serving the zone were found to be completely frozen. A heat gun was used to safely thaw both pipes until full water flow was restored. The crawlspace temperature was observed to be extremely cold; insulation of the space is strongly recommended to prevent future freezing. An estimate to insulate the piping will be emailed to the customer. The antifreeze solution was tested and is providing freeze protection down to 10°F. The upstairs system utilizes steam radiators; only one radiator is equipped with an air bleeder for air relief. The zone was fully purged, and all components were verified to be heating properly and returning hot. At the time of service, the system was operating as designed.
