Troubleshooting & Preventing Common Problems

Start with the two things that cause most of these cases: a dirty sensor and a changed fingertip. Wipe the reader with a soft, dry cloth, dry your hands properly, and try again pressing flat and still rather than sliding.

Damp skin from washing up, sunscreen, hand cream, a paper cut, a peeling callus after the gym, or simply an older or younger finger with shallower ridges will all defeat a stored template that worked last week. Next, try a different finger, and ask someone else in the household to try theirs.

If another finger or another person works, the lock is fine and the fault is with that one enrolment — delete it and re-enrol, recording the same finger two or three times at slightly different angles so the lock has more to match against. If nobody's finger works at all, suspect the sensor or the power.

Weak batteries often cause erratic reading before any other symptom appears, so if the low-battery warning has been sounding, change the batteries first and retest. Stop and call your installer if no credential works, if the sensor is loose, cracked or warm, or if the problem started right after the door took a knock or a soaking. A practical takeaway: re-enrol everyone's prints once a year, and always keep a working PIN as a backup credential.

Flat batteries are the overwhelming favourite, and they are also the easiest thing to rule out. Before assuming the worst, press the pad firmly in the centre with a bare, dry fingertip — capacitive touch panels need skin contact and will ignore a gloved, wet or barely-brushing finger, and some models need a deliberate palm-on-panel (minimally touching the keypad with 3 fingers) to wake rather than a light tap.

If the panel stays completely dark and silent, change the batteries. Replace the whole set at once with fresh alkalines of the type your manual specifies, all the same brand, and check each one is seated the right way round.

Do not mix old and new cells, and do not substitute rechargeables unless your model explicitly allows them. If fresh batteries change nothing, look at the compartment itself.

White or greenish crust on the contacts means a cell has leaked, and a panel that got soaked — rain into an open corridor, or an over-enthusiastic wipe-down with a wet cloth — can go dead until it dries out fully over a day or two. Stop there and call your installer if you see leakage, water inside, a cracked panel, or if the lock is unresponsive with known-good batteries.

Do not open the lock body yourself. A practical takeaway: keep one spare battery set at home so a dead keypad is a five-minute fix, not an evening's problem.

Continuous beeping is almost always one of five messages, and the rhythm tells you which. A repeating chirp each time you use the lock is the low-battery warning.

A steady beep that starts a minute or so after you come in usually means the door is not fully closed — the lock senses it is ajar and is nagging you. A rapid burst after several failed attempts is the anti-tamper lockout, which normally clears itself in one to three minutes if you simply leave it alone.

A loud sustained alarm can mean the lock detected force or a prising attempt on the body. And a repeated beep with a whirring motor usually means the bolt is trying to throw but hitting the strike plate or frame.

Work through it calmly: close the door properly, wait out any lockout, check the battery level, and watch whether the bolt extends fully with the door open. Do not silence the lock by pulling the cover off or yanking the batteries out mid-alarm.

If it beeps with a good battery, a properly closed door and a freely moving bolt, that is an installer call. A practical takeaway: record ten seconds of the beeping on your phone before you ring support — the pattern is how they diagnose it in one minute instead of ten. Usually, if the door is not properly ajar, the ring could be settled by entering the correct pin code from the keypad.

Run one simple test first: open the door and work the handle in mid-air. If it moves smoothly when the door is open but feels stiff or won't latch when closed, the problem is alignment between the bolt and the strike plate — the most common complaint of all, and very common in new BTO flats where the door and frame settle during the first few months.

If it is stiff even with the door open, the fault is inside the lock body or handle mechanism itself. For an alignment issue, look for bright rub marks or scraping on the strike plate and faceplate; those marks show you exactly where the bolt is catching.

Check that the strike plate screws and the handle screws are snug but not overtightened, since over-torqued screws can distort a mortise and bind the mechanism. Also check nothing is fouling the bolt.

Do not spray cooking oil or general-purpose lubricant into the mechanism — it attracts dust, gums up over time and can reach electronics and seals. Do not force a stiff handle repeatedly either; every forced cycle strains the motor and the internal cams.

Anything beyond checking screws and clearing obstructions belongs to your installer, who can shift the strike plate or adjust the door properly. A practical takeaway: report stiffness early, while it is still an adjustment rather than a replacement mechanism.

At times, using the wrong type of battery could also be an issue that causes stiffness on the locking mechanism so please also do use the proper battery required.

The lock has done its job and the door itself is binding. In Singapore's humidity the usual cause is a swollen door leaf, especially after a wet spell, a mopped corridor or rain blowing in.

Second most common is hinge droop: the screws work loose over years, the leaf sags, and the top outer corner starts jamming against the frame. Third is frame or wall movement in a settling building.

Fourth, and easily overlooked, is something physically in the way — a doormat, a shoe, a parcel, or a second lock such as the gate lock or a night latch still engaged. There is also a mechanical variant worth checking: the deadbolt has retracted but the latch bolt has not.

Press the handle fully down and hold it while you pull or push, rather than tugging on a half-turned handle. Safe checks are gentle ones.

Look along the gap for tight spots and shiny rub marks, feel the top corner, clear anything under the door, and lift the handle slightly to take the sag out as you pull. Never kick or shoulder the door.

Planing or rehanging is installer work, and on a fire-rated main door it must not be done casually because the door's integrity depends on how it is built and hung. A practical takeaway: if the binding comes and goes with the weather, it is swelling; if it worsens steadily, it is the hinges.

Check first whether auto-lock is actually switched on, because most locks ship with it disabled and many owners assume the installer enabled it. It lives in the lock's settings menu or the app, and on some models a battery change or a settings reset quietly turns it back off.

Next, check the delay. Auto-lock typically waits a few seconds up to about a minute after the door closes, depending on model, and people often decide it is broken while standing in the corridor for eight seconds.

Then check the door is genuinely closing and latching on its own — if the latch does not fully seat, the lock never registers "closed" and never starts the timer. Two other settings catch people out.

Many locks have a passage, office or holiday mode that deliberately keeps the door unlocked, and it is easy to enable accidentally. And when batteries are low, some models suspend auto-lock to conserve power for manual openings.

Finally, watch the bolt. If the motor tries, meets resistance from a misaligned strike and retracts, the lock is protecting itself and the real problem is alignment.

If none of that explains it, ask your installer to demonstrate the setting on your specific model rather than guessing through menus. A practical takeaway: retest auto-lock after every battery change, and never rely on it without a second way in.

The most likely explanation is that the lock returned to its factory state, which wipes stored user codes and reverts to the default passcode printed in your manual. This can happen if the batteries were removed for an extended period on some models, or if the reset button inside the battery compartment was pressed while the cells were being refitted.

Diagnose it before doing anything else. If fingerprints or cards still work but no PIN does, the problem is likely a PIN-specific setting, an expired one-time code, or a keypad mode rather than a full wipe.

If no credential at all works and the lock behaves like it did on installation day, it has reset. Also check the basics: whether your model requires a confirm key such as # after the code, and whether the anti-peep function is on, which lets you pad your real PIN with random digits and confuses people who forget it is enabled.

Do not keep retrying — commonly three to five wrong entries will trigger a lockout of roughly one to three minutes, though it varies by model. If it has reverted, use the manual's default code to get in, then change it immediately, because that default is public knowledge, and re-enrol every user.

A practical takeaway: keep a photo of your manual's key pages and a written list of who is enrolled, stored somewhere other than behind that door.

Nine times out of ten it is signal strength at the door or a band mismatch on the router. Almost all smart locks join only 2.4GHz Wi-Fi, so a modern router broadcasting one combined name for 2.4GHz and 5GHz can keep steering the lock onto a band it cannot use.

Meanwhile the lock sits at the far end of the flat, behind a metal gate, a solid door and concrete walls — the worst possible spot for a small, low-power antenna. Test it properly: stand at the door with your phone, connect to the 2.4GHz network and run a speed test.

If your phone struggles there, the lock has no chance. The usual fixes are moving a mesh node or the lock's gateway to the hallway within sight of the door, or temporarily splitting your 2.4GHz network onto its own name for pairing.

Other regular culprits are a new ISP router or changed Wi-Fi password after the lock was set up, a channel crowded by neighbouring flats, and low batteries, since wireless is the first thing a lock sacrifices when power runs short. If re-pairing requires resetting the lock, let your installer do it rather than risking wiping your users. A practical takeaway: aim to have the gateway or nearest mesh point no more than one wall away from the lock.

It means the lock has lost its cloud connection, not its brain — and that distinction is why everything still works at the door. PINs, fingerprints, cards, face profiles and the mechanical key are all stored inside the lock itself, so they keep functioning whether or not there is Wi-Fi in the flat.

What you lose is everything that happens away from the door. Remote unlocking stops.

Creating or deleting a temporary PIN from your phone stops. Live notifications stop, so you will not be told when your child gets home or when the helper arrives, and the access log will not update in real time.

Firmware updates also cannot install, which matters over the life of the lock. So it is not an emergency, but it should not become permanent.

A lock that drifts offline repeatedly is often telling you something else — most commonly that the batteries are running down, since wireless is the first function to be sacrificed as power drops. There is one situation where it genuinely matters immediately: if you rely on issuing remote codes for a cleaner, contractor or delivery, an offline lock means you must be physically present.

A practical takeaway: check the app shows online and the battery is healthy before you travel, and treat repeated offline events as a battery or signal problem to fix, not a quirk to live with.

Remote unlocking is a long round trip, and any weak link adds seconds. Your tap travels from the phone to your mobile network, to the manufacturer's cloud, to your home router, to the lock's gateway, and finally over a short-range wireless link to the lock — then the confirmation comes all the way back.

Weak Wi-Fi at the door is the usual bottleneck; poor mobile data where you are standing is the second. Battery-powered locks add their own delay by design.

To save power, many wake only periodically to check for commands, so a two- to five-second lag is normal rather than faulty. Low batteries make that worse.

Beyond that, cloud maintenance or a service outage, an expired app login, or a model that requires an in-app confirmation step can all cause a command to sit and then time out. The important safety habit is not to tap unlock repeatedly.

A queued command may arrive minutes later and leave your door unlocked after you have walked away. Send once, wait, and confirm the status in the app.

If remote unlock consistently takes more than about ten seconds or fails outright, treat it as the same signal problem behind a lock that keeps dropping offline. A practical takeaway: never make remote unlock your only plan for letting someone in — issue a temporary PIN as the backup before you need it.

Almost always it is how that person was enrolled, or where their face sits relative to the camera. Height is the biggest single factor: a lock mounted for an adult of average height may simply not capture a shorter family member or a child properly, and the person then has to tilt or stretch to be seen.

Lighting is the next cause. If someone enrolled indoors in even light but arrives home with strong afternoon sun behind them in an open corridor, the camera sees a silhouette.

Appearance changes matter too — glasses, a fringe, a cap or a mask worn now but not at enrolment can push a face outside the stored template's tolerance. The fix is usually a re-enrolment done realistically: stand where you naturally stand, at the time of day you usually come home, dressed as you usually are.

Many locks let one person store two profiles, which is worth using for someone who wears glasses only sometimes. If a family member repeatedly cannot be captured no matter how they stand, that points to mounting height rather than the person, and it is a fair thing to raise with your installer.

A practical takeaway: give anyone with unreliable face recognition a fingerprint or PIN as their main credential — no household should depend on a single method.

Interference and tap position explain most intermittent card reads. If the card lives in a wallet alongside your transit card, office pass and contactless bank cards, several chips answer at once and the reader gives up.

Take the card out and tap it on its own and you will usually see the problem disappear. Position matters more than people expect.

Most locks read from one specific zone, often marked by the logo or a small icon, and a tap two centimetres off will fail. Hold the card flat against that spot for a full second rather than swiping it past.

Metal nearby also detunes the card — a metal card holder, a phone pressed against it, or the metal gate itself if you tap while the card is against the frame. Physical damage is the other cause: cards that have been bent, cracked, sat on or run through the wash often have a broken internal antenna and will read erratically before failing entirely.

Weak batteries also shrink the read range. Test with the second card that came with your lock.

If that one reads perfectly every time, the first card is failing and you simply need a replacement. A practical takeaway: never label a card or tag with your unit number, and keep spares at home rather than in the same bag as your keys.

A small, even gap all round is normal and necessary — a door needs clearance to swing freely and to allow for timber moving with Singapore's humidity. A slightly larger gap at the bottom is standard too, which is why corridor draughts, cooking smells and lift-lobby noise get in even on a well-fitted door.

What is not normal is an uneven gap: tight at one corner and wide at the opposite one, or a gap you can see clearly through at the latch side. That points to a door hung out of square, a frame that is not plumb, or hinges that need adjusting, and it is worth raising with your installer while the work is recent.

For a fire-rated main door, clearance matters more than on an internal door, because the door, frame and seals are certified as one assembly and are designed to close and latch fully on their own. If you are thinking of adding a draught excluder, brush strip or self-adhesive seal, check with your door supplier first rather than sticking something on, since add-ons can affect how the certified assembly performs.

A practical takeaway: within the first month, let the door swing shut from halfway and confirm it latches without a push — that single test catches most alignment and gap problems while they are still easy to correct. Moreover if your door is fire-rated, there’s a maximum standard for the gaps at the sides and top which is 3mm for door edge to frame and between 3mm to 10mm for the bottom of the door to the floor.

Assume it is moisture, and act early — an exposed gate lock lives in driving rain, corridor humidity and, near the coast, salt-laden air, which is a far harsher environment than a sheltered main door. Surface rust on the gate frame itself is cosmetic; rust or grit inside the mechanism is what makes a bolt stick, and that gets worse quickly once it starts.

The most useful habit is a monthly wipe with a dry or barely damp cloth, paying attention to the underside, the keyway and the seam where the cover meets the gate. Check that the rubber gaskets and any keyway cover are seated properly, because water getting behind the cover is what actually kills these locks.

Do not spray engine oil or all-purpose lubricant into a digital gate lock. It attracts dust, degrades seals and can reach electronics.

If the mechanism genuinely needs lubrication, ask your retailer which product is correct for your model. Do not paint over the lock either.

Also check the gate itself: a gate that has dropped or twisted makes the bolt grind on every cycle, and the lock takes the blame for a hinge problem. If the display flickers after rain, or you see corrosion at the battery contacts, stop using it and call your installer.

A practical takeaway: when buying, specifically ask whether the model is rated for outdoor exposure — an indoor-grade lock will not survive an open corridor.

Mild warmth is often perfectly normal; genuine heat is not. A metal faceplate sitting in afternoon sun on a west-facing corridor or an exposed gate will absorb heat all day, and a Wi-Fi lock that has been transmitting, or a motor that has just cycled several times, will feel slightly warm for a few minutes.

None of that is a fault. What deserves attention is warmth with no sun on the door, warmth that is constant rather than occasional, or a lock that feels hot rather than mildly warm.

Pair that with any of these and treat it as urgent: batteries draining much faster than usual, a chemical smell, a battery cover that no longer sits flush, or a motor that strains and whines on every cycle. Those symptoms point to three realistic causes — a swelling or leaking battery, often from mixed or non-specified cells; a motor working continuously against a misaligned bolt; or moisture inside causing a short.

Safe checks are limited to what you can see. Confirm all cells are the same brand and type and correctly oriented, and confirm the bolt throws freely with the door open.

If you suspect the batteries and you have a mechanical key to hand, remove them. A practical takeaway: warm plus short battery life is a service call, not a wait-and-see — do not open the lock body yourself.

Ghost touches and self-unlocking are two different problems, and it is worth separating them. Random lighting up, beeping or numbers registering on their own is almost always moisture on a capacitive panel — rain into an open corridor, condensation, a wet cloth used to wipe the lock, or residue from a sticker or cleaning spray.

Insects behind the cover, a cracked panel, a bag leaning against the pad and very low batteries can all do it too. Dry the panel thoroughly and see whether it settles.

A door that genuinely opens on its own is more serious, but the cause is usually mundane. Check whether passage or holiday mode has been left on, whether an old temporary PIN is still active, whether a family member triggered a remote unlock, or whether the bolt was never fully thrown so the door only appeared locked.

Your access log settles it — it will show which credential opened the door and when. Review it the same day.

If the log shows an entry nobody can account for, change every PIN, remove any card or fingerprint you cannot identify, and call your installer. A practical takeaway: dry the panel first and check the log second; an unexplained unlock is never something to leave until the weekend.

Treat a factory reset as a genuine last resort, and understand that the procedure differs by model — follow your own manual, or better, let your installer do it. A reset wipes everything the lock has learned: every fingerprint, PIN, card, face profile, the app pairing, Wi-Fi settings, auto-lock and volume preferences, and on many models the access history.

The lock then reverts to the default passcode printed in the manual, which anyone holding that manual knows, so it must be changed the moment you are back in. Just as important is what a reset does not fix.

It will not cure flat batteries, a stiff handle, a misaligned bolt, a swollen door or a weak Wi-Fi signal. Resetting a lock with a mechanical problem simply loses all your users and leaves the problem intact.

It is reasonable only when the software is genuinely confused — settings that will not save, credentials that keep disappearing, a pairing that cannot be repaired — and ideally after support has confirmed it. Done wrongly, a reset can leave some locks in a state that needs a service visit.

A practical takeaway: before any reset, write down who is enrolled and photograph your settings screens, then ring your our support line first — most problems that look like they need a reset do not.

Stay calm, because you almost certainly have a way in, and work through the options in order: Mechanical key override. Most digital locks have one, often behind a small sliding cover or under the handle.

If you have the key, this is the fastest route. Emergency power.

If the keypad is completely dead, it is usually flat batteries. Many locks have an external power contact — a USB-C or micro-USB port, or two small terminals — that lets a power bank wake the lock long enough for you to enter your PIN or fingerprint normally.

Someone else's access. If the lock is online, a family member with the app can unlock remotely or send you a one-time PIN.

Call for help. If none of that works, ring your retailer's after-sales line.

They will know your model and whether a technician can attend. What not to do: do not force or lever the handle, do not prise off the cover, and do not attempt to open the door by any other means.

You risk injury, damage that is not covered, and a much larger bill than a service call. A practical takeaway: prevention costs nothing — keep the mechanical key somewhere sensible, keep a small power bank and cable in your bag, and save your retailer's number in your phone today rather than searching for it in a corridor.

Give it to a person, not a hiding place. Under the mat, on the door frame ledge, in the shoe cabinet, behind the meter box or under a plant pot are the first places anyone would check, and in an HDB corridor you can be watched retrieving it by neighbours, delivery riders or passers-by.

Any key kept outside your flat is effectively a key anyone can find. The best option is a trusted neighbour, or family living nearby — ideally someone usually at home, whom you would be comfortable trusting with your flat anyway.

It costs nothing, and it comes with a person who can also let a plumber in or check on a leak. If you want something physical, use a proper attack-tested key safe rather than a cheap combination box: fix it into concrete rather than relying on adhesive, site it out of direct view, and change the code periodically.

Check first with HDB or your condo's management on fixing anything to a common corridor wall. With a digital lock there is a better answer still: your spare key can be a spare credential.

Enrol a PIN you keep only for emergencies, or leave a card with a parent. A practical takeaway: never label a spare key or card with your unit number or address.

Most shortened lifespans come down to power, moisture, force and neglect rather than product quality.

• Using cheap carbon-zinc batteries, mixing brands or old with new, or fitting rechargeables the model does not support — leakage inside the

compartment is a genuine killer here.

• Ignoring the low-battery warning for weeks, which leaves the motor straining on thin power at exactly the moment it needs current.
• Spraying WD-40, oil or strong cleaners on the lock, or wiping it with a soaking cloth.
• Slamming the door, hanging heavy bags on the handle, or using the lock as a handle to haul a heavy door shut.
• Living with a stiff handle or a bolt that needs a shove, so the motor fights the misalignment on every single cycle until it fails.
• Never re-enrolling fingerprints, never changing codes after a renovation crew or helper leaves, and letting an unauthorised handyman open the

lock body. None of these are dramatic; they are all small habits that add years or take them away.

A practical takeaway: do a two-minute check each quarter — battery level, a dry wipe of the panel, and let the door swing shut on its own to confirm it latches cleanly without help.