This is a surprisingly common mistake with temperature readings. Especially when the system has a thermal safety power off that triggers if it's above some temperature, but then interprets -1 deg C as actually 255 deg C.
The rollout is still happening, but the new resident water meters for Victoria, Australia come with a temperature fix.
Prior to this year, they could only handle 0-127 degrees for the water temperature. Which used to be sensible, but there were some issues with pressurised water starting to be delivered to houses resulting in negative temperatures being reported, like -125C, which immediately has the water switch off to prevent icing problems.
The software side also switched from COBOL to Ada. So that's kewl.
