While you wait for answers, we may have found some information which could help you.
Click here for Open Stuck BottomWhere can I Purchase a Velux Kem-140 Skylight motor?
Velux KEM 140 skylight elec. opener only workd intermittent?
Velux skylight?
My VELUX remote won't work - how can I repair it?
Stuck (open) Velux window?
How can I mend the broken cord on my velux skylight?