What component could it be? Associated with Uponor C-35 controller. This starts with the Uponor C-37 thermostat, which has sometimes been discussed here. Could there be any fet switch 2 channel? SMD
Uponor Wired 12 Channel Controller C-35 | Underfloor Store
C35 manual by Uponor UK - Issuu
Uponor Wired 12 Channel Controller C-35 | Underfloor Store
Uponor Smatrix: Room Temperature Controls | Uponor