Fred S Salt Lake City , UT November 04, 2015 Appliance: Gaggenau ED220-630 Gaggenau Ed220-630: Error code f24. How to replace Power Supply Module, Ed 220/221. Basically have rebuilt the electronic portion of this fine appliance. this entailed removal of the oven then disassembly to remove circuit boards. very helpful to take pictures of the process as you go so you get the wires back to the right place. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes