The door curtain is made from aluminium slats, it rolls up into a box above the door)
These are usually sold as 'maintenance free'- but they do need some checks from time to time
Check curtain is clean, particularly in the joints between slats
Check tracks are clean and dry
Check motor limit settings ie upper and lower stop points are correct
Check links or straps between curtain and shaft are not loose or cracked (the back box cover if fitted will need to be removed for this)
Check fur strips in channels are present and secure
Check endlocks or webbing strips are not damaged (these stop the slats sliding sideways and fouling endplates or mechanism in the box)
Check the top track guide rollers are correctly positioned and functioning.
Check safety system is functionong correctly
Change safety system batteries if fitted (some systems have a 'curly wire' and therefore no batteries)
The door is made from four or five sections and travels vertically up a track and back into the roof of the garage)
These doors do require regular maintenance and usually some adjustment
Check the integrity of fixings in the frame and track hangers.
Check the pos of rollers. This is critical to the correct closing of the door into its seals. Seals soften with age and the panels can then seem loose and let in draught or light
Check spring tension
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