F20 is a No Water Detect error.
It is an indication that you either have no water coming into the washer, or very little water at all. If the pressure switch has not tripped after 6 minutes, the error code is displayed. This can be a potential problem with the following:
* If you have NO water in the wash tub, check the following:
- Inlet water valve may be clogged. Clean inlet screens if necessary.
- Make sure water taps are on.
- Check inlet hoses for kinks or clogs.
* If you HAVE water filling the wash tub, check the following:
- Make sure you don't have a siphoning problem. Click the following link for instructions:
Duet_Service_F20_errorHope helps.
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