When the door entry goes, it goes for everyone
A door entry system is one of those things nobody thinks about until it stops working. Then the problem is immediate: the delivery driver cannot get an answer, a visitor is left standing in the street, or the front door simply will not open.
The good news is that most faults repeat themselves and have well-known causes. In this guide we run through the usual symptoms, what is normally behind each one and what you can check yourself before ringing us. For repairs and replacements, everything is set out under door entry systems.
First question: one flat or the whole block?
This is the question that narrows the diagnosis fastest:
- Only one flat: the fault is usually in that flat’s handset or monitor, in its wiring, or in its push button on the street panel.
- Every flat: that points at the shared parts, such as the power supply unit, the entrance panel, the speech module or the door release.
- Part of the building: often a problem in the riser cabling or in a distributor.
Make a note of whether the fault is constant or comes and goes, and whether it started after heavy rain, a storm or building work in the entrance hall.
Symptoms and likely causes
| Symptom | Most likely causes |
|---|---|
| No sound from inside or from the street | Failed speech module, damp in the panel, cut cable, volume out of adjustment |
| Constant hum or buzz | Ageing power supply, poor joints, interference from mains cabling |
| The handset does not ring | Push button on the panel, failed handset, wiring in that flat |
| The door does not open | Burnt out or misaligned door release, a door that is catching, release button in the handset |
| It only opens sometimes | Not enough voltage, a dropped door, a tired release spring |
| Black screen on the video entry monitor | Faulty monitor, panel camera, power supply or video cable |
| Streaky picture or no colour | Degraded cabling, corroded connections, excessive distance with no compensation |
| The whole system is dead | Power supply, a tripped breaker in the consumer unit, a short circuit |
The most frequent faults, one by one
1. Audio problems
This is the number one fault. The loudspeaker and microphone in the street panel take sun, rain and dust all year round. Over time they lose sensitivity or the contacts corrode. On the coast, in places like Salou, the salt air speeds all of that up.
Usual fix: replace the speech module and seal the panel properly. If there is a hum, check the power supply and the cable joints.
2. The door will not open
If you press the button and hear the release buzz but the door stays shut, the cause is nearly always mechanical: the door has dropped, it is catching on the frame, or the latch is pressing too hard on the release. If you hear nothing at all, the release may have burnt out or may not be getting any voltage.
Usual fix: adjust the door, realign the keep and, if necessary, fit a new door release.
3. One flat gets no calls
Usually the push button on the panel, a loose wire in the terminal block or the handset in that flat. On digital or two-wire systems it can also be a programming problem, or the monitor’s address.
4. The power supply unit
This is the heart of the system and it works around the clock. As it ages it causes humming, weak calls, flickering screens or a complete blackout. Sitting in an unventilated or damp cupboard, it degrades faster still.
5. Video problems
On a video entry system, a black screen may be the monitor, the camera or the power supply. Streaks, flicker or washed-out colour usually mean degraded cabling or corroded connections.
6. Faults after a storm
Voltage surges and nearby lightning can damage power supplies, panels and monitors all at once. If everything failed right after a storm, that is the first suspect.
What you can check yourself
Without opening anything or touching the wiring:
- Ask your neighbours whether they have the same problem.
- Check the volume on the handset or the monitor.
- Make sure the handset is properly on its hook: on older systems, one left off the hook can block the line for everyone.
- Look at the communal consumer unit in case a breaker has tripped, carefully, or by telling the chair of the residents’ association.
- Try pushing the door while someone presses the release. If it opens that way, it is an adjustment problem.
Anything involving the panel, the power supply or the cabling should be left to an engineer.
Repair or replace?
It depends on the age of the system and on the fault:
- Repairing makes sense when the fault is localised, such as a speech module, a door release or a single handset, and the rest of the system is sound.
- Replacing is worth it when faults keep coming back, spare parts have dried up, or the residents’ association wants to move to video. In many cases the existing cabling can be reused with a two-wire system. We cover that in how to upgrade your building’s door entry system.
How to prevent faults
- Periodic checks of the panel, the power supply and the door release.
- A well-sealed panel, protected from direct rain.
- A dry, ventilated cupboard for the power supply.
- Surge protection in the communal consumer unit.
- Adjusting the entrance door as soon as it starts to catch.
If the door entry system in your block in Tarragona or nearby is giving trouble, ask us for a quote with no obligation. We trace the fault, tell you honestly whether repairing or replacing makes more sense, and put a clear proposal in writing.