Why the intercom won't open the door: the 5 most common causes
The door release (also called the electric strike) is the hardest-working part of the whole installation: it opens and closes hundreds of times a day in a building full of neighbours. These are the failure causes we deal with most in Valencia:
- Worn door release or strike: over the years the mechanism loses strength, the latch sticks and the door stops giving even though it buzzes.
- Faulty handset push button: the open button on your intercom phone is worn or corroded and doesn't send the release command.
- Cut or loose release wire: the cable carrying the command from your flat to the strike has come loose at a terminal block or is damaged.
- Power supply lacking output: a tired power supply may have enough for the intercom to ring but not to activate the door release, which draws more current.
- Mechanically misaligned latch or lock: the door has sagged or the frame has shifted, so the latch presses against the strike, which can't free it.
Electrical or mechanical fault? How to tell them apart
Before requesting a quote, it helps to know which type of fault you're facing, because the repair is very different:
Symptom and likely origin of the fault
This guide table helps you locate the source of the fault based on what happens when you press the open button:
| Symptom | Likely origin |
|---|---|
| Buzzes but the door won't open | Worn strike (mechanical) |
| No buzz and no opening | Electrical (wire, button, power supply) |
| Opens only sometimes | Strike on its way out or worn button |
| Won't open only from your flat | Your handset's button or wire |
| Very faint buzz | Power supply running short |
| You have to push the door hard | Misaligned latch or door |
Remember the opposite symptom is also common: the door opens but the call can't be heard. In that case, you'll want our article on the intercom that doesn't ring.
What to check yourself and when to repair or replace
Before calling a technician, spend a couple of minutes on these simple checks, with no tools and no risk:
- Ask a neighbour if the door opens for them: if it works for no one, the fault is in the strike, the communal wiring or the power supply.
- Do the door-push test while someone presses the release, as explained above.
- Watch whether the door latch rubs or jams against the strike when closing: a sign of a sagging door.
- Check whether the intercom rings and sounds fine: if everything else works, the fault is narrowed down to the release circuit.
As for the repair: if the strike is many years old, the most cost-effective option is usually to replace it with a new one, an inexpensive part we change in the same visit, fitting it to the frame so it doesn't give trouble again. If the fault is in the push button or the wiring, we repair the circuit and check the power supply. And if the installation is racking up several faults, it may be worth considering a full upgrade: we cover the warning signs in our article on the most common door entry system faults.
Frequently asked questions
If you hear the door release buzz but the door won't give, the electrical side is working: the fault is almost always mechanical. The most common causes are a worn strike, a misaligned latch or a sagging door pressing against the strike. It's usually solved by adjusting or replacing the strike.
The door release is a relatively inexpensive part and replacing it is usually done in a single visit. The final price depends on the model (standard, fail-safe or security) and the condition of the door. We give a fixed, no-obligation quote before starting any work.
The entrance door release is part of the building's communal elements, just like the street panel or the power supply, so its repair is the responsibility of the homeowners' association. If the door only fails to open from your flat, the problem may be in your handset, in which case the repair falls to the owner.
Replacing a door release means choosing a model compatible with the system (AC or DC), respecting the wiring and fitting the part precisely to the frame so the latch works without forcing. An imprecise fit ends up breaking the mechanism within weeks. In communal installations we recommend having it done by a certified technician.
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