ban-all-sheds, the installers have agreed to make it right and have only charged me 50% of the cost until that has been done. Unfortunately, they don't seem to know how to make it compatible. Prior to me agreeing the sale, the salesman contacted the technical department at Hormann who gave him instructions on how to use the receiver in my existing Merantic electric mechanism to enable the existing remotes, and my fitted car remote to control the new door (via the push button connections). The installer followed Hormann's instructions, but they didn't work and after a number of calls to Hormann techies, was told it wasn't possible! So, the seller/installer of the door has acted in good faith and is still keen to make it right. Prior to agreeing to the sale, I had done my own research regarding Hormann doors and compatibility with my car system and this universal receiver was recommended to me by the company that manufactured the car transmitter (Home Link). Hence, I'm simply passing on details to the installer, but I want to make sure it is done correctly and to my satisfaction