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Mend Henderson Marathon 550SL Wont Work Anyone Help

wont work can anyone help?

my mum has a Henderson marathon 550sl electric garage door.power going to main unit-plug checked to be ok.-but no response on manual override switch or on transmitter-which had a new battery fitted yesterday.serial no. of the actual unit housing the pcb`s is m5l-3015575-dont know if this helps.the door can be opened by other members of the family but not by mum as the door is far too heavy-manually.has anyone any idea?

silverfox
November 2011
HendersonHenderson Marathon 550SLD.I.Y, Windows and DoorsWont Work Anyone Help

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Henderson Marathon 550SL Not Working - Help!