Garage in house we're moving to has a Henderson 800 deluxe mark II remote control door opener.
It is operated by an Alltronik 27MHz handset. This is a grey box with a big red operator button and a lift off flap.
We know it works since we saw a car parked in the garage whilst viewing
But....
- No instructions were left by the previous owners :-(
Please can anyone supply basic instructions for either the Henderson unit and/or the Alltronik handset.
Yes, the 27MHz band is out of date, but I'd like to make the inherited system work before upgrading
- There must surely be a battery in the handset (PP3/MN1604.according to a battery web site).
The battery still seems to be active as a red light comes on if the operator button is pressed.but how do you expose it? The flap is too small.
- Any other information on either the Alltronik or Henderson 800/880 greatly appreciated.
TIA