Hi from retired Englishman in SW France,
'unb' is likely to stand for 'unbalanced' and spinning shows any problem with balance the most!
It is necessary to ensure absolutely that the machine, even when empty, has all 4 feet very firmly on the floor, and I mean firmly ;-0)
Doesn't matter whether it is empty or not but switch it off then-
very firmly push one front corner diagonally into the centre of the machine and see if the machine moves or rocks AT ALL, even the slightest. If it does you will need the open-ended spanner which came with the (new) machine........which of course went missing a long time ago?!! An adjustable spanner will suffice.
Adjust the foot under that corner downwards until it is very firmly- almost pushing- against the floor but not so far that the corner lifts up!
If this corner did not rock do the same to the other.
Once you cannot rock the machine the slightest little bit, screw the locking nuts up tight to the underside of the machine so that they will not move. Ideally the rear feet should also be locked.
If this has not cured the problem it is possible that the internal suspension is malfunctioning.
Good luck,
John C
UNB means unblock on this machine. Remove the filter located at the front of machine bottom right as you are looking at it. Put a towel on the floor first as some water will run out. The filter unscrews, instructions should be on the inside of the cover. Make sure it is all cleaned inside. If the filter appears clean, check inside the housing for such things as a coin or other small metal object that might be jammed inside causing the contacts to read as blocked. I found a pound coin causing mine to error.
WATER DRAIN ERROR - Display shows 5E.
5E is displayed if the water level frequency detected is 25 KHz or less in the initial phase of the UNB -detecting cycle. The Water Drain error can be cleared by turning POWER SW OFF and back ON.
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