Roll-up garage doors

Thanks for the replies.
I think one part of the explanation is that our back entrance is on a slope. The installers never managed to compensate for that. The door gets stuck now and again.
Still waiting for them - at least we can get in and out now.

We have had one for 20 years and the only time we have a problem is when the power is off. However, this is simply fixed with the manual release cord.

Good point Auntieflo. I'll ask him when he has cooled down.

Fennel, has the battery in the key fob been checked, that sends the signal to the battery on the actual door, that is the receiver?

I thought they were all fitted with a manual release.

We have up and over garage doors and had the odd problem in 20 years but easily sorted. Not had a roll up one.