Motion Sensor Dead? We'll Trace It Back to a Fixable Cause in Wolverhampton

A motion sensor that no longer reacts when you walk past it is one of those faults that is easy to put off and hard to ignore. It might not have tripped for weeks, or it might be a single zone on your alarm panel showing as missing or faulty every time you try to set the system. Either way, the sensor is not doing its job, and the honest answer is that several different problems all look identical from the outside. Batteries die, sensors drift on their brackets, radio links drop, tamper switches stick and internal electronics fail. The purpose of our visit is to work out which one you have, rather than swapping parts until something happens to work.

Why a motion sensor stops responding

On a battery-powered sensor, a flat or corroded battery is the single most common cause, and a battery that is nearly flat often behaves oddly first — the sensor may trigger late, intermittently or not at all before it dies completely. Corrosion on the battery contacts can interrupt the circuit even with a fresh battery fitted. On wired sensors, a loose connection at the panel or a damaged cable run can take the zone down. Physical causes are just as common: a sensor that has been knocked out of alignment by a door slamming or a ladder leaning against the wall may no longer cover the area it was aimed at, so it looks dead when it is actually just looking in the wrong direction. On wireless systems, a sensor that has lost its pairing with the hub or panel will sit silent no matter how much movement it sees. And sometimes the sensor's own electronics have simply reached the end of their life.

How we diagnose it

We start by putting the sensor into a walk test so we can see exactly what the panel reports as you move through the room. From there we check the obvious things first: battery condition, contact cleanliness, the tamper switch, and whether the sensor's field of view still covers the space it was installed to protect. On wireless units we check the signal strength between the sensor and the panel and, where the equipment supports it, re-pair the sensor properly rather than just power-cycling it and hoping. On wired units we test the wiring continuity and the connections at the panel end. If the sensor turns out to have internal electronics damage or end-of-life symptoms, we will tell you plainly that a replacement is the realistic option, and we will not sell you a repair that will not last.

Your options once we know the cause

Most fixes are straightforward. A battery replacement, a bracket re-aligned and re-fixed, a contact cleaned or a wireless link re-established are all sensible visits in themselves. If a sensor needs replacing, we match the type to the panel you already have — mixing incompatible brands rarely ends well — and we quote the replacement parts separately so you can see exactly what you are paying for before deciding. If we find the fault is elsewhere in the system, such as the panel or a wiring run, we will tell you what that involves and what it is likely to cost before you commit to anything. You approve the full cost before any work starts, so there are no surprises.

What we cannot promise

We diagnose and repair honestly, but we do not claim any sensor will detect movement in every condition — no detector does. Mounting position, room layout, pets and even strong sunlight all influence how a sensor behaves, and if we think the sensor's placement is part of the problem, we will say so rather than simply replace the unit and leave you with the same fault in a new box.

Booking your visit

Call or use the website to arrange a visit, and tell us the make of your alarm system, whether the sensors are wired or wireless, and exactly how the fault shows itself — no trips at all, intermittent, or an error on the panel. That detail genuinely speeds up diagnosis. 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.