Help with VTH1550CH "door open" locked

JMO

n3wb
Joined
Apr 14, 2017
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Hi I have 2 VTH1550ch the one on the ground floor is OK the one on the 1st floor as the buttons for unlocking of the door locked, usually we only use the one on the ground floor so it could be like this for ages.
How can I access the door unlock button.
VTH.jpg
Thank you
Jorge
 
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