Intruder Sensor Not Triggering? Restore Detection Where It Counts in West Bromwich

An intruder sensor that no longer triggers is a fault that hides in plain sight. The panel may show a missing or faulty zone, the alarm may refuse to set, or — most worryingly — nothing may appear wrong at all until you walk the route the sensor was meant to cover and the siren stays silent. PIR motion detectors, magnetic contacts, curtain sensors and shock sensors all stop triggering for a short list of reasons, and diagnosing rather than replacing is nearly always the cheaper, better route. Our visit is structured to prove the actual cause and restore detection you can rely on again.

Why intruder sensors stop triggering

The leading causes are mundane. On wireless sensors, a flat or dying battery is the top culprit, often producing intermittent response before final failure — a sensor that triggers slowly, at half range or only when you walk straight through its centre is usually a battery warning, not a broken unit. Tamper faults are next: a sensor case that has not been closed properly after a battery change, or a tamper switch that has stuck, can put the whole zone out of service on some panels. Physical causes follow: a knocked or drifted sensor pointing away from its coverage area, a contact pair separated by a dropped door or swollen frame, or a dirty PIR lens that no longer sees heat movement clearly. On wired systems, broken or chafed cabling and loose connections at the panel account for many dead zones. And on wireless systems generally, a lost or degraded radio link — a sensor moved, a hub relocated, new interference in the home — can leave a sensor alive but unheard.

How we diagnose it

The walk test is our first instrument: we put the panel into its test mode and move through the space while watching what the system reports, which distinguishes a dead sensor from a mis-aimed one from a marginal one within minutes. From there we check the battery and contacts, the tamper switch and case closure, the alignment and field of view, the lens condition, and the wiring on hard-wired zones. On wireless units we check signal strength and, where the equipment supports it, re-establish the pairing properly rather than by trial and error. Panel diagnostics often identify the failing zone precisely, and we use them rather than guessing. You end the visit with a named cause and a clear recommendation.

Repairs, replacements and expectations

Batteries, contacts, tamper switches, alignment and radio links cover most repairs, and all are quoted before work begins. Where a sensor has genuinely failed internally or is obsolete and unsupported by your panel, we will say that replacement is the honest option, matched to what your system accepts, with parts quoted separately. If we find the sensor was never suited to its position — too small a coverage pattern for the room, or a contact type that cannot tolerate a door's movement — we will say so rather than repeatedly repair the wrong device. No sensor can be guaranteed to detect in every condition, which is exactly why a proper walk test after any repair matters: we verify detection live, with you, before we call the job done.

Booking a sensor diagnosis

Phone or use the website and tell us which sensor or zone is affected, what the panel shows, and whether the fault is total or intermittent. You pay a booking fee when you book, labour is charged hourly at a rate that depends on how soon you need the visit, and the full cost is quoted and approved before work starts, with any parts quoted separately.