highest speed on baumatic extractor no longer works

[freefall123]

I have a Baumatic BT79 cooker extractor hood that is vented to the outside. It has 3 speeds and has worked flawlessly for 3 years. The other night I switched it onto the highest speed and got no extraction just a low hum, the other 2 speeds work just fine. What could be wrong?

Freefall

[Jim]

I'm not sure, but I think it's broken.

[Lobster]

Try this thread:

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David

[Freefall]

Thanks, I'll try the oil