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Sebo auto X4 height adjustment not working

\015 I have an intermittent problem with the height adjustent on my Sebo automatic X4 extra. It sometimes stays at max height. The servo motor has been replaced without producing a cure. The "UP" and "DOWN" lights do not light when the fault is present. Does this indicate a problem with what ever drives the servo rather than the servo motor itself? Unfortunately I have not located any information on the workings of this cleaner, e.g. circuit diagrams, to help locate this fault.\015\012Any suggestions please?\015

Answers :

Worst case scenario is that there's a fault on the circuit board, but another possibility is that the brush roll is not rotating freely. The automatic height adjustment works by sensing the drag on the brush roll, and altering the height to maintain constant drag. So, if the brush roll is sticking, the sensor detects the extra drag and raises the height accordingly. First thing to do, then, is remove the brush roll and remove any hair (the most common problem) or other stuff that may be wound round it - especially at the ends near the bearings. Check that the brush roll is able to rotate freely. \015\012
\015\012If this doesn't solve the problem, the next possibility is that a spring has broken in the clutch/sensor device where the two drive belts meet. That will cause the sensor to "think" there's more drag on the brush than there actually is, and hence to raise the height as before. This clutch (which isn't really a clutch) has two toothed pulley wheels - one driven by the belt from the motor, the other driving the brush roll. Holding one wheel stationary, the other can be rotated slightly and there should be increasing resistance to that rotation. If the spring has broken there will be no resistance until you reach the limit stop. Unfortunately, if you've no experience of these units, it can be really difficult to know whether one is broken or not! The third possibility - failed circuit board - is, in my experience, the least likely. These are typically extremely reliable, and will usually last the life of the machine (25 years or more). I've never known one fail, but it's always possible.\015\012
\015\012I hope this helps. Any questions, just post here again and I'll do what I can. Please remember to rate this response. Thanks!
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