Article reference KA-01331
Every German built heat pump uses the FD code (Fabrication Date) in the above format. For example, a heat pump with:
FD8806 = 2008, June
FD9111 = 2011, November
FD9803 = 2018, March
FD0107 is 2021, July.
The date simply explains when the product was made, not when it was sold.
