Aircon Diagnostic Cases

An aircon that trips only in the rain narrows the fault to one place outdoors. What to inspect, and why it recurs if it is left untouched.

An aircon that shuts off part way through a cycle with nothing visibly wrong. When behaviour is the only symptom, what to suspect first.

When each clean over a kitchen line returns less than the last, a tighter cycle will not help. How to tell that cleaning has run out here.

All rooms failing at once does not mean damaged wiring inside the walls. What to test first, and why the repair can be a great deal smaller.

Four rooms failing at once is rarely four faults or a dead system. What a simultaneous failure points at, and why it shrinks the repair.

Auto mode stopping early while cool mode still runs fine points at what the unit reads, not what it does. How to confirm before replacing.

A bedroom leak soon after servicing points at a joint rather than a crack in the pipe. What to check before agreeing to open up the wall.

A unit that stopped cooling is not always at the end of its life. What collects around a condenser near greenery, and how it builds up.

A buzzing wall unit is held on by two separate connections. Which one has slackened decides the fix, and neither of them needs a new part.

Servicing on schedule while cooling slips and the bill rises. Why running hours, rather than the calendar, should be setting the interval.

A rocking outdoor unit does not mean the whole mounting is going. Why one corner behaves differently, and what to check before any work.

Tripping after servicing rarely means a failed electrical part. What gets left open during the work, and what the weather then does to it.

A new system that never cooled is not always defective equipment. What a longer pipe run needs at install, and why that step gets skipped.

A tripping breaker with a hot smell reads as a compressor short and usually is not. How the trip pattern tells you which, before anyone quotes.

A leak in a new flat does not always mean a poor installation. What household fixings do to a drain run, and how to spot it fairly quickly.

A new unit that has never drained properly is not always faulty. Why the run matters more than the equipment, and what to check along it.

Normal airflow but warm air points at the coil, not the compressor. Why kitchen grease defeats general servicing, and what actually clears it.

Weak airflow after nearby building work is not permanent damage. What a single heavy dose of dust does, and what putting it right takes.

A part swapped with no change at all does not condemn the outdoor unit. What that failed repair has already proved, and where to look next.

Weak airflow with the fan still turning is rarely a failed cassette. What starves a sound motor, and why the symptom looks so identical.

A drip that starts days after a coil clean is not a drain that blocked on its own. What to check, and why it need not keep happening again.

Water onto desks below a cassette does not prove a cracked pan. What to check before an old unit is lowered or talked toward replacement.

A leak during heavy rain does not mean the safety device has failed. What can outpace a protective shutdown, and what to change instead.

A cassette that will not cool while gas keeps going in. Why repeated top-ups can be treating a symptom rather than a cause, and what to check.

A cassette rattling after a service rarely needs the unit taken down. What to check on the outside of it before booking any access work.

A cassette that rattles at some fan speeds and not others is not failing bearings. Why that narrowness matters before an outdoor quote.

A ceiling drip that appears on humid afternoons only. How that timing limits how much ceiling comes down, and where to open it up first.

A drip and a drain code above a finished ceiling. How to tell a blocked pump from a finished one, and what each answer will cost to fix.

A drip hours after a service is not coincidence. Why the drain joint is the first check, and what to see before accepting a tray replacement.

A concealed unit fading each year is rarely the compressor. What a filter never reaches, and why the decline is gradual enough to hide.

Leaking only after power outages does not mean a failed pump. Why a protective lockout looks identical, and what clears it without cost.

A code from one room on a shared system does not condemn the whole thing. Why the fault can be local, and what that saves in overall scope.

Clicking then shutdown does not justify quoting a board and a motor together. What opening the unit settles before either gets ordered.

A buzz in the quiet gaps points at hardened mount rubber more often than the compressor. Why runtime is the question that separates them.

Replacing working equipment on a prediction is a real risk. What should set the order across several ageing systems in a working clinic.

A room that shuts down only after busy sessions is rarely failing electronics. What load exposes, and where to look before ordering parts.

A room that weakens through the day and recovers overnight is not worn out. What accumulates during working hours, and where it collects.

Sea air near a coastal condo does not automatically finish off an outdoor unit. What is recoverable here, and what genuinely is not any more.

Poor cooling that invites repeated top-ups is not always low gas. How a correct charge still underperforms, and what to check on indoors.

Repeat gas loss on a coastal unit raises a real choice. Why patching one fitting can be the false economy, and how to size the decision.

Cold air that barely moves is not always a failed fan motor. What the motor is pushing through, and what to check before replacing it all.

A compressor quote past twelve years is a system decision, not a part decision. What to check first, and why both figures belong in writing.

A concealed unit dripping from its panel need not mean a finished pump. What decides whether this is a cleaning job or a full replacement.

A musty bedroom rarely means growth behind the wall. What stays wet inside the unit between cycles, and why cleaning alone keeps failing.

Dirt back within weeks of a wash does not always mean a poor wash. What to check before booking another clean or changing your contractor.

A leak that starts when renovation ends is not always damage. What building work leaves in a drain path, and what that costs to clear up.

Two things must agree before a condo install proceeds, and only one is technical. Why the estate rule needs settling before a deposit is paid.

A leak near a drain after servicing does not always mean a crack. Whether water is leaving the pipe or arriving on it, and how to tell.

Vibration felt indoors does not mean a failing compressor. What sits between the unit and the structure, and why it stops working well.

A shaking outdoor unit is not automatically a motor replacement. What watching it through the speed range settles before anything is ordered.

A new system running warm is not always defective equipment. What to rule out before starting a warranty claim on a brand-new installation.

A new system running warm does not always mean a leak. What gets left inside a circuit when a step is skipped, and how it presents later.

A young system falling behind is rarely undersized. What can change outside a building to cap cooling, and what to check before upgrading.

Cooling that fades under load is not always a refrigerant problem. What else fails at a coastal outdoor unit, and how to separate them.

Sometimes replacement really is the answer. What has to be tested before a compressor verdict is fair, and how to recognise a real one.

Cutting out every afternoon and running fine by evening is not an internal fault. What to check in the space around the outdoor unit itself.

Dripping only on humid days does not mean a cracked pipe inside the wall. What to check before agreeing to any hacking work in the house.

A system that resets itself is not always failing electronics. What interrupts a supply momentarily, and how to find it before spending.

Every room weakening together on a ducted system is not a failing plant. The shared part above the ceiling that nobody sees, or cleans.

When every wash returns less than the one before, cleaning has stopped being the answer. How to read that before rebooking another one.

A reliable system faulting after nearby work is rarely a failed part. Why shared trunking is shared exposure, and what to check for first.

An error after a neighbour's renovation is rarely a failing board. Why the fault appears as the day warms, and what that narrows it to.

An error after a thunderstorm rarely means a damaged indoor board. What years of vibration do to a terminal, and how to check it first.

An error right after servicing does not prove the board was damaged. The difference between a locked board and a dead one, and how to tell.

A fault that appears when renovation ends is rarely the board. Why damage from other trades surfaces late, and what to check to find it.

A fault that needs hours of running before it appears is rarely a board. What builds up in that time, and where to start looking for it.

A drain error that returns after every clearing is describing the pipe, not the debris. What to check above the ceiling, and why it recurs.

A fault returning after each repair does not mean a wrong diagnosis. When cleaning cannot restore what corrosion removed, and what can.

An error that returns after every reset is rarely a dead board. Why a connection behaves this way, and what to check before any spending.

All zones warm at once with a pressure code showing. Why the code names a reading rather than a part, and where the fault usually sits.

A drain that keeps choking in a dusty building is not where this starts. What keeps on feeding it, and what changes the outcome long term.

A leak after a wash is rarely the pump failing. What had to be disconnected for the work, and why it can look finished but still not seal.

Poor cooling in a factory office does not always mean escaping gas. What to check outdoors first, before any leak hunt gets quoted for.

Repeated tripping does not mean replacing a whole cable run. Where moisture gets into an enclosure, and what that narrows the job down to.

A factory office warming again does not mean a failing compressor. What moves far less air once it is damaged, and how to spot it outside.

A unit is rarely unsuited to a workshop. Why the cleaning interval, rather than the equipment, usually needs to change, and by how much.

Water siphoning back is not a failed pump. What gets fitted against its own flow direction during a service, and how to spot that quickly.

A mounting that deteriorated early does not condemn the equipment. What sustained heat does to isolators, and what replacing them buys.

Warm air only after a service does not mean a damaged compressor. What gets left part-open during routine work, and how to check for it.

Losing cooling near the coast does not force an early replacement. What rebuilds faster than the service interval, and how to plan for it.

A drain backing up straight after a service is rarely a real blockage. What gets left in place during the work, and where to look for it.

A leak right after routine servicing rarely means the pump has failed. What gets disturbed during reassembly, and what to check for it.

A leak days after servicing usually means the reconnection, not failed pipework. What to check first, before anyone opens the wall trunking.

A leak after servicing is not always accumulated deposit. What a few millimetres of height does to a drain run, and how to check on it.

Poor cooling does not always mean the system needs more gas. What settles on an outdoor coil near kitchens, and why topping up keeps failing.

A young system losing gas is not always poor manufacturing. What an exposed high floor does to outdoor connections, and how quickly it does.

An office that stopped keeping up is rarely too small for the space. What changes around a ceiling unit, and what to check before upsizing.

A room warming each afternoon is rarely a fault nobody can find. What arrives seasonally around a garden condenser, and where it packs.

An unfindable leak usually means an unfinished search. How eliminating accessible joints narrows it, and what to do once they are clear.

A leak returning beside an old repair does not mean the repair failed. What that pattern says about the pipework, and how to scope the work.

Three top-ups in a year does not automatically mean the coil or compressor. Where a leak hides from repeated searches, and how to find it.

A worn motor on an ageing unit is an arithmetic problem, not a puzzle. What has to be weighed before the repair is worth doing at all here.

Finding a drain choke does not mean removing trunking along a whole wall. How to narrow the location first, and what that saves in work.

Weak cooling and a high bill do not always mean a fault. The third possibility besides repair or replacement, and what it changes here.

A hum from a high-floor unit rarely means a finished compressor. Why there is more than one set of rubber, and which of them ages first.

Ice on the pipe reads as low gas and often is not. What separates blocked airflow from a refrigerant leak, and what to check before a top-up.

A silent outdoor unit reads as a dead compressor and often is not. The start path between the command and the terminals, checked in order.

Mounting bolts that will not stay tight on a factory unit. Why tightening them again keeps on failing, and what to look at underneath them.

A bracket pulling away is not always poor workmanship. Why old wall material fails around a sound bolt, and what the real repair involves.

Fading cooling does not always mean a system that is losing gas. What building work nearby leaves on an outdoor unit, and how it presents.

A silent drain pump after a wash rarely means a failed pump. What gets missed during reassembly, and how to check it in under a minute.

Fouling again soon after a wash does not always call for a deeper one. Why a spotless filter can mean nothing reached it, and what to check.

A trip during a storm is not always storm damage. Why weather can reveal an existing fault rather than cause one, and what to check outdoors.

The shortest pipe route is not always the one that drains. Why fall has to set the layout, and what ignoring it costs after completion.

A rattle after a storm does not mean damage inside the unit. What an impact does to a guard, and why it can no longer sit flat afterwards.

A drain smell is worth listening to rather than masking over. What it announces before a blockage arrives, and what acting early avoids.

Regular servicing and steadily less cooling do not mean a worn-out machine. What routine work leaves behind, and when to go deeper than it.

LG CH35 can mean a blocked outdoor fan, a failed sensor, or a real leak. How to tell them apart, and why a fading top-up is not a repair.

An error code arriving days after a chemical wash on an older system. Why the timing matters more than the age, and what to check first.

A gas code does not always mean corroded pipework or an ageing system. The alternative that costs far less, and how to tell them apart.

Losing gas does not mean opening finished walls and ceilings. Why the accessible end gets checked first, and what that usually settles.

Another top-up restores cooling today but settles nothing. How to weigh repeated gas against finding the escape once, and what it takes.

A startup rattle that fades is not automatically a motor replacement. What the fading tells you, and what to eliminate before quoting it.

A bedroom rattle rarely means opening up the indoor unit. What sits alongside it and taps in sympathy, and how to confirm that quickly.

A cassette dripping late in the day need not mean a failed pump. Where the water is actually going, and what to check before access work.

A mall install sequenced from the technical scope will overrun. Why permitted access hours have to set the programme, and what that means.

One warm room on a multi-split is rarely a leak or a failed unit. What meters flow to each coil, and what happens when one of them sticks.

A musty smell does not mean the unit has to come off the wall. How far the problem reaches decides the work, and how to establish that.

A unit overheating early is not always ageing equipment. What clearance a condenser really needs, and what happens when it comes up short.

A new system that never cooled properly is not always defective. Which commissioning step gets cut, and who should be putting it right.

A hum from a new outdoor unit in open wind is rarely the motor. What resonates against its own mounting, and how to confirm it quickly.

A noise from a brand-new unit does not always start a warranty claim. What gets left inside during transit, and how to go and check on it.

A repair that changed nothing eliminates one part and nothing more. What to check before elimination starts pointing at the compressor.

A warm bedroom in a new flat is not always bad installation. What fitted joinery does to clearance, and what the unit actually requires.

Strange behaviour on a new install is rarely defective equipment. What gets connected wrongly at the outdoor unit, and how it presents.

A gas code on a new install is not always a leak. The step that gets skipped at commissioning, and how to tell which one happened here.

A new fit-out that never cooled is not always the wrong system. Where the air is actually going, and what the ceiling work changed here.

A buzz on a newish unit does not have to mean a warranty claim and a wait. What a hand on the casing can settle in a matter of seconds.

A leak on a new system after its first service is not an equipment fault. Where the water escapes, and what that narrows things down to.

A newish unit dripping in humid weather is not always a warranty case. Why level matters more than age, and what to check on the bracket.

A unit that came back noisier is rarely a damaged component. What gets reassembled slightly out of true, and how that sounds afterwards.

On a long concealed pipe run, the record of what was opened is the diagnosis. Why age explains nothing without something to date it against.

A leak after a relocation is not always a blockage. Whether the run can carry water at all, and what to check before clearing anything.

A leak after a service rarely means the pump has failed. What comes off during the work, and why refitting it wrongly can look identical.

An ageing unit is not always the reason servicing stops holding. What roadside dust does to a filter, and why washing cannot recover it.

A whistle only at high fan speed is rarely an internal fault. Why a symptom confined to one speed narrows things down, and where to look.

An error after peak load can be a protective device doing its job. What stops a unit deliberately, and what to check before ordering parts.

Ceiling units spaced for symmetry can end up with nowhere to draw air from. What a ceiling plan leaves out, and what to check before sign-off.

A failed outdoor unit does not automatically condemn the working half. What decides whether the indoor side is able to stay where it is.

Tripping under load does not automatically mean a control fault. Where a cable fails first, and why the position it was fitted in matters.

A hum through a ceiling is not always the unit above it. How a suspended unit is meant to hang, and what happens when the load is uneven.

A rattle near the pipework does not mean trouble in the refrigerant circuit. What holds an exposed run in place, and what to look out for.

A unit that shuts down after long runs is rarely a failing board. What deliberately stops a system, and why that is a safety feature at work.

An office that slips by afternoon is not always short of plant. What to check in the recess outside before anyone quotes for an upgrade.

A warm zone after a relocation does not mean damaged equipment. What gets left in the wrong position during a move, and where to check.

A leak right after a wash points at reassembly rather than pump capacity. What to check before agreeing to replace a pump on an older unit.

Fasteners that keep coming loose are not always badly fitted. What repeated wetting does to their grip, and what replacing them involves.

A thump at start-up on an older outdoor unit rarely means internal damage. What the timing tells you, and what to check on the ledge below.

Fixings that need tightening again and again are not the problem. What sits between the unit and the wall, and why it moves under load.

Water along a trunking run does not always come from the drain. What else produces it inside the casing, and how to tell the two apart.

A rattle heard at night is not always a fault inside the unit. What hardens at the bracket over the years, and why the noise grows slowly.

A clean-looking filter can still be the wrong filter. Why a poor fit quietly lets dust past the edges, and what that costs over the years.

When clearing a drain repeatedly fails to stop a drip, the blockage is not the fault. Where to look before replacing the whole indoor unit.

A trunking drip does not always mean cracked pipe inside a wall. What perishes at an access point, and what that saves on the repair bill.

Three faults on one ageing multi-split. How to tell when separate repairs stop adding up and full replacement becomes the cheaper answer.

Swapping a single indoor unit is only cheap if the outdoor unit accepts it. What sets that limit, and what happens when it is exceeded.

An office running warm after partition work has not lost capacity. What building work changes about air paths, and what to check first.

A zone staying warm while controls look fine is rarely a programming fault. What to check mechanically before anything gets reprogrammed.

One warm room on a shared system is rarely a refrigerant leak. Why a shared circuit fails everywhere at once, and what that leaves you.

One warm side of an office and one fine side is not a plant problem. What a split like that rules out, and where the fault usually sits.

One side of a room warmer all year can be one fault, not two. Why that distinction decides between a repair and a full replacement here.

A communication code naming the outdoor unit can come from the indoor one. What such a code actually reports, and how to locate the end.

A leak after a wash on an older unit rarely means a worn-out pump. What gets left short of fully home during reassembly, and how to tell.

A unit that will not restart after a wash is rarely damaged. What gets left in the wrong position, and what to check before any callout.

An outdoor unit that barely cools is not always worn out. What a heavy-handed clean can do to the fins, and whether it can be recovered.

A new noise after a storm is not always storm damage. Why recent work is worth checking first, and what gets left slightly out of place.

Buzzing and clicking without starting looks like a dead compressor. The cheaper fault that presents identically, and how to tell them apart.

Clicking that arrives each afternoon and stops again by evening is tracking temperature. What that rules out before a motor gets quoted.

Sometimes the compressor really has failed. What has to be ruled out first for that verdict to be worth acting on, and in what exact order.

An outdoor unit louder at night is rarely a breaking compressor. Why quiet surroundings change what you hear, and what to check instead.

A rattle in a sea breeze rarely means a failing fan motor. What coastal air does to fasteners, and what to check before ordering parts.

A rattle after storms is usually not the motor at all. The cheapest thing to eliminate first, and why it is easy to miss behind the guard.

No indoor airflow with the outdoor unit running is not a whole-system failure. What to test before replacing the indoor unit or anything more.

Tripping after rain sounds serious and often is not. Why moisture exposes a fault rather than creating one, and what to check outdoors.

Tripping only at the moment of start-up points at a connection rather than the compressor. What to check first, before any part is replaced.

Buried copper decides the real cost of a house-wide replacement. Why the pipework should be tested before any equipment decision is made.

A persistent musty smell is rarely coming from the walls. What establishes itself beyond the reach of filter cleaning, and how to treat it.

Corrosion inside a sealed enclosure does not prove poor sealing. How salt gets into a closed box near the sea, and what it does inside.

An error in an old building does not condemn all of its wiring. Why one point on a run fails first, and what that means for the repair.

An unresponsive ceiling unit rarely needs work above the ceiling. What order to eliminate things in, and why the cheapest often comes last.

One dripping unit does not justify overhauling all four. What to establish before agreeing to work on the ones behaving perfectly well.

An error with no pattern that resists every search is rarely a failed part. What else can interrupt a link, and how to go about proving it.

A startup rattle does not always justify a full fan assembly. What can drift out of position on a shaft, and what putting it back takes.

An unresponsive remote rarely means a failed indoor board. What sits between the handset and the board, and what to test in what order.

Three units behind identical casings can need three different levels of work. Why a whole-flat price hides what each room actually shows.

A replacement recommended on age alone is not a diagnosis. What has to be tested before a system is condemned, and what it often finds.

Same-age systems do not always wear at the same rate. When staging a high-floor replacement beats doing both at once, and what decides.

A musty smell is not always coming from inside the unit. Why moving air makes any smell noticeable, and what one simple check will settle.

A blockage that returns however often it is cleared is not the fault. What the route itself is doing, and why clearing can never hold it.

A noisy retail unit is not always a failing compressor or fan. What continuous building vibration does to fixings, and how to check them.

A unit that stops on a daily schedule is not failing controls. What outside the unit runs to the same timetable, and how to go find it.

Parts wearing out early read as neglect, and often are not. Why replacement schedules assume an average location, and what changes here.

A ceiling unit shifting over a shop floor looks unsafe. Why the assembly's own redundancy hides the fault, and what to check on the rods.

Dripping only near closing time is not an intermittent fault at all. Why a long trading day exposes it, and what to check on the drain pump.

An install that works on paper can still leave every unit worse off. What a shared shaft has to carry, and why fit alone decides nothing.

A leak after a cleaning visit rarely means a blocked concealed run. What to check behind the access panel before exposing any pipework.

A shophouse system that cannot cool is not always too small. What an enclosed airwell does to discharged heat, and how to confirm that.

Fixings that will not stay tight are not always the problem. What a bracket bears on matters more, and how uneven brickwork defeats it.

A fixing that keeps working loose is not always poor workmanship. When the cause cannot be removed at all, and what to ask for instead.

Tripping after rain does not always mean failed rooftop electrics. How water travels to get there, and what to inspect before replacing.

Tripping after rain does not mean the isolator has failed inside. Where water gets in, and why replacing the assembly might not stop it.

A trunking drip after other trades have been through is rarely a blockage. What gets disturbed along a route, and how to find it quickly.

Short cycling that starts after a service is rarely a failed part. What gets knocked out of position during the work, and where to look.

A drain smell on a brand-new system is not a fault in the equipment. What has to be filled before a trap works, and why it gets missed.

One room always warmer does not mean the system is undersized. What to check on that branch before any plant upgrade is considered at all.

Fewer outlets than bedrooms is not being sold short. Why fixed capacity spread thinly cools nothing well, and what should set the number.

Each leak taken alone is a small repair. Why a third top-up in a year changes the question, and what should decide the scope of the work.

Three zones failing overnight really does point at the board. What has to be proved first, so the part is not replaced on a guess alone.

A near-new system quoted for chemical washing throughout. What settles whether it is needed at all, and when routine servicing is enough.

Tripping on hot days only is not a fault that is hard to catch. What weakens with heat before it fails outright, and how to measure it.

Two rooms failing together is rarely two faults or a spreading problem. What the pair share, and why that shrinks the repair considerably.

Two sides of a cassette strong and two weak points somewhere quite specific. What an uneven symptom rules out before the unit comes down.

Repeated topping up is not a maintenance schedule. When refilling stops making sense as an answer, and what should be taking its place.

A unit that has never once been quiet has not worn out. Why the absent starting point is itself the finding, and what to check first here.

A dripping cassette does not always mean the drainage was installed wrongly. What a damp location asks of a pump, and where margin goes.

A warm meeting room after a fit-out is not always bad installation. Why what the system is told matters more, and where to go and check it.

Water onto the floor does not always mean a cracked tray. What seals an outlet without damaging anything, and how to clear it out safely.

Ceiling water marks under a ducted system need not mean a failed pump. Why one that never ran looks identical, and what to check first.

A musty smell from an aircon is almost never escaping refrigerant. What actually produces it, and why it keeps returning between cycles.

Fading cooling near the sea does not always mean a leak. How a full charge can still underperform, and what to inspect outdoors before that.

On a shared system the rooms that work are free evidence. How one weak room gets isolated before anyone prices chemical work across the flat.

An eatery cassette losing air early is not always an early death. Why a bound grease film survives routine cleaning, and what removes it.

Weak airflow with a clean filter is not a worn-out unit. What sits behind that filter, and why washing it on schedule proves very little.

An overhaul does not always restore cooling near the sea. What cleaning can recover and what it cannot, and how to know before booking.

Every room failing at once does not condemn the outdoor unit. Why a single room can take a whole system down, and how to locate which one.

Weak airflow in a workshop office is rarely an internal failure. What goes unchecked where nobody owns maintenance, and what it costs you.