Chamberlain 3800E Manuel D’Utilisation

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® 
GARAGE DOOR OPENER  
Model 3800E 
For Residential Sectional Doors With 
Torsion Assemblies Only 
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Owner’s Manual 
■ 
Please read this manual and the enclosed safety materials carefully! 
■ 
Fasten the manual near the garage door after installation. 
■ 
The door WILL NOT CLOSE unless The Protector System
® 
and cable tension monitor are 
connected and properly aligned. 
■ 
Periodic checks of the opener are required to ensure safe operation. 
■ 
The model number label is located behind the hinged door of your opener.