>> The door opener may have been fitted retrospectively to an existing up-and-over door.
>>
>> If the door opens after you 'help' it, that points to inadvertent use of the
>> opener while the door was locked, stripping the latching gubbins on part of the opening
>> belt. Depends on the door as to whether the belt can be repositioned or whether
>> it needs replacement.
>>
So what you're saying is the chain driven by the motor will lock the door when the latch is engaged. That makes sense as I couldn't open the door with the opener. When I arrived at the house, the garage door was partly open and I was told the house clearance mob had trouble with the garage door. Wouldn't surprise me if they bust it, as a fridge/freezer that should have left was also gone. I had to free off the door lock and mechanism.
Plenty of other work to be done before I sort this and I'm capable of opening it manually.
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Garage door opener new
Garage door opener new