You have lost your garage door remote: what happens next
A lost remote is a security problem before it is an inconvenience. Why the fix is wiping the receiver, not buying another remote, and what it involves.
It is a security problem first
A lost garage remote is not an inconvenience that a new remote fixes. It is a key to your house that is now somewhere else — in a car that was broken into, in a bag left in a restaurant, in the pocket of a tenant who moved out. Whoever has it can open the garage until it is removed from the receiver, and on most houses the garage has an unlocked door into the kitchen. The answer is not to buy another remote. It is to wipe the receiver and start again.
Wiping the receiver
A garage motor's receiver holds a list of the remotes it will answer. Wiping it clears that list — every remote, including the lost one, stops working — and the remotes you still have are paired back in one at a time. It takes a few minutes at the motor, it costs almost nothing, and it is the whole of the security fix. A remote programming visit for a lost remote does this first and supplies the replacement second.
On a motor that also runs a gate, the same is true of the gate receiver, and the two are wiped together.
When the motor is old
Motors from the nineties and early two-thousands use dip-switch remotes — the little row of switches inside the case that set the code — and there is nothing to wipe; anyone with a remote on the same brand and the same switch setting can open the door. Those remotes are also mostly no longer made. The fix is an external receiver with modern rolling-code remotes, wired to the old motor, which keeps a perfectly good motor and gives it a modern, wipeable, unclonable remote system. It costs far less than a new motor and it is the standard answer on the older houses of Claremont and Parow.
Tenants, guests and turnover
The lost-remote problem is worst where remotes change hands on purpose: a student let with a new tenant every semester, a holiday house with a new guest every week, a complex where the previous owner's remotes were never handed over. The receiver is wiped at every change of hands — it is the cheapest security a landlord or host can buy — and a guest-house motor with a re-pairing schedule is a motor nobody's past guest can open.
The neighbour's door
One more remote problem that is not a lost remote: in a complex where a dozen garages share a receiver frequency, a remote that sometimes opens the neighbour's door is not a joke and not paranoia — it happens in Brackenfell and Parklands every week. A receiver on a different frequency ends it, and it is the same visit.
What to do right now
If the remote was lost with your address — in a car with the registration, in a bag with your ID — treat the garage as unlocked tonight: lock the door from the garage into the house, and unplug the motor if you can reach it. Then book the receiver wipe. If the remote was simply mislaid at home, the urgency is less, but the wipe is still the right answer, because a remote that turns up in a drawer in six months is not the one you should be worrying about.