NF means "not filling". This means that either there is no water getting to the machine or it's at too low a pressure.
Given the information regarding sediment it strongly suggest that the water inlet filter is blocked. Although I'm unfamiliar with your exact model, you will usually find that when you unscrew the flexible inlet hose from the spigot on the back of your machine there will be a gauze filter inside the spigot. Remove and clean it and consider fitting an in-line external hose filter to the inlet hose. Before refitting the inlet hose, ensure that there is a good strong water flow through it.
If I've made the correct diagnosis you should find that the code has gone when you reconnect your washer and turn to both the water and power supplies and turn it on once more.
If not, then please report back for alternative suggestions.
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