The Short Answer
Gate intercoms fail for one of two broad reasons: the hardware has corroded, or the service it depended on has gone away. The hardware side is straightforward — intercoms are electronics with a speaker, a microphone, and a button, mounted outdoors in Houston humidity, and corrosion on terminals or a water-damaged board is the common end. The service side catches people off guard: many older telephone entry systems were built around a copper landline, and as those lines have been discontinued the intercom stopped working through no fault of its own. If your intercom quit around the time you changed phone service, that is almost certainly what happened, and the fix is a cellular or internet-connected unit rather than a repair.
Most Likely Causes, In Order
01
The landline it depended on was discontinued
A very common cause on systems more than a few years old. Older telephone entry units dial a phone line to reach you, and as copper landline service has been retired or replaced with internet phone service that does not support them, those units lost the thing they needed to function. Nothing in the intercom is broken. The replacement path is a cellular unit, which needs no line at the gate at all.
02
Corrosion from humidity and rain
An intercom is an outdoor-mounted electronic device with a speaker grille, a microphone port, and wiring terminals, which is close to the worst possible environment in a climate like ours. Moisture gets past aging gaskets and works on the terminals and the board. Symptoms progress from crackling and intermittent audio to one-way audio to nothing at all.
03
Failed speaker or microphone
These are the exposed components and they fail first. One-way audio is the classic sign: you can hear the visitor but they cannot hear you, or the reverse. On an older unit this is often the point at which replacement makes more sense than repair, because the rest of the unit is the same age and in the same environment.
04
Lost cellular or network connection
On modern cellular and cloud-connected systems, the intercom depends on a data connection. A lapsed service plan, a carrier network change, a failed SIM, or a wifi password change at the property will all take the system offline while the hardware remains perfectly healthy. Worth checking the account and the app before assuming hardware.
05
Surge damage to the intercom board
Intercoms sit at the end of a long low-voltage wire run, often in a conduit that acts as a convenient path for surge energy. Houston electrical storms kill intercom boards with some regularity, and the failure is usually total and sudden rather than gradual. It often happens alongside erased keypad codes and remote programming.
06
Damaged wiring between the intercom and the operator
The run from the intercom to the gate operator and to the house is buried or routed through conduit, and it is vulnerable to landscaping work, trenching, rodents, and corroded direct-burial splices. Standing water in a conduit that was never properly sealed will corrode a splice over a few seasons. The symptom can be intermittent in a way that tracks the weather.
What You Can Safely Check Yourself
These checks separate a hardware failure from a service problem, which is the difference between a repair and a replacement.
- ✓Press the call button and listen for any sound, click, or tone from the unit
- ✓Note whether audio works one way only, which points to a speaker or microphone
- ✓If it is a cellular or app-based system, check the account status and the app
- ✓Think back to whether it stopped working around a change in your phone service
- ✓Look at the unit for water staining, a cracked faceplate, or corrosion at the grille
- ✓Note whether the gate still opens by remote and keypad, which isolates the fault to the intercom
Access Control Is Security, Not Convenience
A dead intercom is usually treated as an inconvenience, and it is worth reframing. The intercom is how you decide whether to let someone in, and without it the common workarounds are worse: propping the gate open, handing out the keypad code widely, or leaving the gate unlocked for expected deliveries. Each of those converts a controlled entrance into an open one. If the intercom will be down for a while, use a temporary keypad code you can change afterward rather than defeating the gate. Do not open the intercom housing or the operator enclosure to investigate; the wiring terminates in an enclosure with line voltage in it.
When to Stop and Call Someone
Call if the unit is silent, if audio works only one way, or if it stopped around the time your phone service changed — that last one is a replacement question, not a repair, and it is worth knowing before you spend money on diagnosis. Our $89 diagnostic covers the intercom, its wiring run, the board, and the connection to the operator, and it is applied toward the repair. If the right answer is a modern cellular unit, we install those, including systems that ring your phone wherever you are, let you grant access remotely, and keep an entry log. We are CellGate-certified.
Questions People Ask
Why did my gate intercom stop working?
Either the hardware failed or the service it relied on went away. The hardware side is usually corrosion: an intercom is an outdoor electronic device with a speaker, microphone, and terminals, and Houston humidity works on all of them. The service side catches people off guard — many older telephone entry systems needed a copper landline, and as those lines were discontinued the intercoms stopped working with nothing actually broken in them.
My intercom stopped working when I changed phone companies. Is that related?
Almost certainly. Older telephone entry systems dial a traditional phone line to reach you, and internet-based phone service generally does not support them. Changing providers, dropping the landline, or having copper service retired in your area all break the intercom while leaving the hardware intact. The fix is a cellular unit that carries its own connection and needs no phone line at the gate.
I can hear the visitor but they cannot hear me. What is that?
One-way audio, and it usually means either the speaker in the gate unit or the microphone has failed. These are the exposed components and they are the first to go in a wet climate. On an older intercom this is often the point where replacement makes more sense than repair, because the rest of the unit has had the same years of weather exposure and will follow shortly.
Can I replace my intercom with something that rings my cell phone?
Yes, and it is the most common upgrade we do on this. Modern cellular systems call your phone wherever you are rather than a handset in the house, let you see and speak to whoever is at the gate, open it remotely, grant temporary access to visitors or contractors, and keep a log of who came in and when. They need no phone line at the gate. We are CellGate-certified and install these regularly.
My intercom is dead but the gate still opens with the remote. Is that useful?
Very. It tells you the gate, operator, power, and receiver are all healthy and the fault is confined to the intercom, its wiring, or its service connection. That is a much smaller and cheaper problem than a gate issue, and it means we can go straight to the intercom rather than diagnosing the whole system.
Is it worth repairing an old intercom or replacing it?
It depends on what failed and how old the unit is. A damaged wire run or a corroded terminal on an otherwise sound unit is worth repairing. A failed speaker or board on an older telephone-entry unit usually is not, both because the rest of the unit is the same age and because a repaired landline system still depends on a line that may be going away. We will tell you which situation you are in rather than defaulting to replacement.