Hotpoint WDD960 Washer Dryer and Error Code F12. Press power button 5-10 minutes later F12 flashes up. Unplug power, repeat. This started happening just out of warranty, so about 2-3 years! Had someone out and they found an obstruction in the waste pipe, stopped for a while. Does it most times I go to use it, but it's been almost a week of non-stop fail.