Intercom Troubleshooting

The reason a dead intercom feels mysterious is that people check things at random. A technician doesn't - they work outwards from power in a fixed order, because each stage either clears or confirms a whole class of faults. Follow the same order and you will usually land on the cause without guesswork.

The sequence is simple: power → connection → audio → video → gate-release. If the unit is completely dead, you stop at power. If it powers up but there is no sound, you stop at audio. If sound works but the gate won't open, the fault is downstream at the gate-release. Below we go through each stage, what to check, and what the result tells you.

For any specific symptom you can jump straight to its dedicated guide - no power, no audio, buzzing, gate not opening, or a power-supply fault - each linked below. This page is the map; those are the detail.

Walk these five stages in order. You can do every one of them safely, and each result narrows the fault dramatically - so even if you stop and call us, you and we already know where the problem lives.

Knowing your system type tells you which handful of parts to suspect first, before anyone opens a cover.

Troubleshooting is safe right up to the point where mains voltage or the gate-motor board is involved. Knowing the line keeps you - and your electronics - out of trouble.

Troubleshooting in sequence is not just tidy - it is what keeps a repair cheap. The single most common way people overspend on an intercom is by replacing parts in the wrong order: a new handset for what was actually a dead power supply, or a whole new unit for what was a corroded trigger wire. Each wrong guess costs a part and a visit.

The power-first sequence avoids that because it eliminates the cheapest and most common faults before the expensive ones are ever considered. If you tested a hundred not-working intercoms, the majority would be resolved at the first two stages - power and connection - long before anyone needed to look at the camera, the panel or the board. Working any other way means paying to rule out the rare faults first.

It also matters for the gate-release fault specifically. Because the intercom and the gate motor are two systems joined by a thin trigger wire, a rings-but-won't-open fault is constantly misread as a broken intercom - leading to a needless replacement that changes nothing, because the real fault was in the wire all along. The remote test in stage five settles that in seconds.

When the safe checks do not resolve it, here is exactly what a technician does - the same sequence, with the instruments to go deeper.

The five-stage sequence works on any intercom, but each brand has its own quirks worth knowing before you start. We carry parts and wiring diagrams for all of them.

Most overspending on intercom repairs comes from a handful of avoidable missteps. Knowing them is half of troubleshooting well.

Replacing the unit first. The instinct when an intercom "dies" is to buy a new one. But if the real fault is a R450 power supply or a R600 trigger wire, a new unit is money spent on the one part that was never broken - and the fault often returns, because the supply or wire is still the problem.

Ignoring the power stage. Skipping straight to the camera, the handset or the panel means paying to rule out rare faults before the common ones. Power and connection account for the majority of "not working" calls; checking them first is the single biggest money-saver.

Misreading "rings but won't open" as a broken intercom. It is the trigger circuit nine times out of ten. The 60-second remote test settles it - and skipping that test is how people end up with a new intercom and a gate that still won't open.

Living with an intermittent fault. A unit that works "most of the time" is usually a dying battery or a failing supply, and it will fail completely at the worst moment. Caught early on a load test, it is a cheap planned fix rather than an emergency call-out.

Letting a general handyman touch the gate-motor board. A wrong connection at the trigger terminals can damage the control board, turning a small repair into a board replacement. Low-voltage does not mean low-risk where the gate-motor electronics are concerned.

A two-minute prep makes the visit faster and the repair more likely to finish in one trip - because it lets us bring the right part.

Most of the time troubleshooting points to a cheap, single-part repair - which is exactly what you want. But honesty matters, and occasionally the right answer is a new system rather than another repair. Knowing the difference saves you from pouring money into a unit that is genuinely at the end of its life.

Replacement usually makes sense in three situations. The first is obsolescence: the unit is old enough that spare parts - handsets, cameras, boards - are no longer manufactured, so even a simple fault cannot be repaired with genuine parts. The second is repeated, unrelated failures: when a unit has had three or four different parts fail in a short space, the underlying electronics are deteriorating and each repair only buys a little time. The third is simple economics: when the cost of the repair approaches the cost of a new, better unit - especially if the new one adds GSM or app access you actually want - replacing is the sounder spend.

Even then, we will tell you plainly which it is. The default is always to repair, because a single failed part is far cheaper than a new system and most intercoms have years of life left in them. We only recommend replacement when the numbers and the parts situation genuinely favour it - and we will show you why, not just tell you.