During a load of laundry the other day, i heard the dreaded error beep. When i went and looked it said F06 E02. The door would not unlock until i manually unlocked it. I opened washer and checked all connections. I entered the diagnostic mode and when I pushed start it would lock the door but would not advance past the C00 step. I decided to replace the ccu so after receiving the new part from APP, I installed it but when I turned it on it immediately gave me a F06 E03 error. I checked all of the connections to make sure they were secure and I even took the front control panel off to make sure those wires were securely connected. Still nothing. I put it in diagnostic mode again and this time when it started the door never locked and never advanced past the C00 step. I took the new CCU out and replaced it with the old one and everything reverted back to the original errors and door locking but not advancing past C00 step. Now I am utterly confused.:confused: Any help would be greatly appreciated.

So the fix for me was the mcu. I tried the ccu first but that didn't fix it. When I removed the circuit board on the mcu as part of the replacement process,there was a black mark on the board and the mcu housing so I knew this was the problem. Sure enough that was it. After replacing the ccu and that not working, I talked to a repair man over the phone and he said he sees the mcu go bad on the duets all the time. Thankfully appliance parts pro has a great return policy. Give the mcu a try as this worked for me. Hope it works for you.