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We built a free scorecard that shows how your heat pump, ventilation and solar systems are performing. Results are usually surprising.
No thanksWe built a free scorecard that shows how your heat pump, ventilation and solar systems are performing. Results are usually surprising.
No thanks
We tell you if it's a real fault or a system that just needs cleaning, before you pay for anything.
Your air conditioner isn't working the way it should. A room that won't cool properly, a sound that wasn't there last summer, or a unit dripping water where it shouldn't. These symptoms send most people searching for air conditioner repair.
Many of those call-outs turn out to be unnecessary. The system doesn't have a fault. It hasn't been serviced, and a professional clean resolves it.
This page explains how to tell the difference between a system that needs cleaning and one that has genuinely broken down. It won't replace a professional assessment, but it will help you understand what you're likely dealing with before you spend anything.
Want a technician to just tell you? Book an air conditioner repair diagnosis →
A service addresses the condition of the system: cleaning the internal fan, the internal coil, the filters, the drain tray and drain line, and the outdoor unit, with a performance check afterward.
A repair addresses a component that has failed: a motor, a control board, a refrigerant leak, an electrical fault. These are hardware problems a clean won't fix.
The two are often confused because a dirty system produces symptoms that look like faults. A blocked drain line causes water to drip from the indoor unit. A fouled internal fan causes vibration and noise. A coil caked in grime causes the system to run continuously without reaching the set temperature.
If air from the indoor unit feels noticeably reduced, the most common cause is a blocked filter or debris on the internal fan blades. The system keeps running but can't move enough air to cool the room effectively. Try cleaning the filter yourself first, since that resolves this in most cases.
A musty smell, sometimes described as a dirty sock or vinegar odour, points to mould or mildew growing on the internal coil or in the drain tray. A clean resolves it.
If the air feels the right temperature but the room takes far longer to get comfortable, the system is working harder than it should. Dirty filters or a debris-blocked outdoor unit are the usual cause.
One of the most alarming symptoms homeowners report. In most cases it traces to a blocked drain line, where sludge builds up over time and moisture backs up and overflows. See why air conditioners leak water for the full explanation and what to check first.
A blocked filter is the most likely cause. The internal fan is fighting restricted airflow, and the added effort produces a noticeable change in sound.
Technicians responding to repair call-outs frequently find a system that hasn't been maintained, rather than one that has genuinely broken down. Three scenarios appear repeatedly.
A homeowner reports the system has stopped cooling and assumes a major component has failed. When the indoor unit is dismantled, no mechanical fault is present. The internal fan is coated in mould and grime, blocking airflow entirely. A professional deep clean restores normal operation. No repair was needed.
Loud vibration suggests a failing motor. In practice, dust and debris on the fan blades create an unbalanced load that vibrates against the casing. Cleaning the fan eliminates the noise in most cases.
Performance drops so significantly the owner believes the system has reached the end of its life. A professional deep clean recovers substantial lost performance, often in units only a few years old.
The following symptoms are less likely to resolve with a clean and more likely to indicate a component that has failed.
If the unit pushes a strong volume of air but the temperature doesn't change, the refrigerant circuit or compressor is the likely cause. These are mechanical failures a service cannot address.
Grinding points to motor bearing failure. Screeching indicates a fan component under mechanical stress. Banging suggests a broken part moving inside the unit. A sharp, sudden sound rather than a gradual change warrants a fault assessment.
Visible ice needs immediate attention. While a severely blocked filter can cause ice formation, it's also a recognised sign of a refrigerant leak. Switch the unit off. If cleaning the filter doesn't resolve it, a qualified technician needs to assess the refrigerant system.
Check the circuit breaker first. Air conditioners can trip their breaker after a power disruption. If the breaker is fine and the unit still won't respond, check the display for a fault code before calling anyone.
Most modern air conditioners display a fault code when something outside normal operating parameters has been detected. The important thing to know before booking a repair: many common fault codes point to servicing causes, not hardware failure. A dirty filter, a fouled internal coil, a blocked drain line, and a restricted outdoor unit all produce fault codes on most brands.
A professional service is the right first step when one of those codes appears. If the code returns after a thorough service, that narrows the picture toward something requiring a repair technician. Retrieve the code before calling anyone and bring it to the conversation. It speeds up diagnosis considerably.
Auckland's humidity means air conditioners running through summer generate significant moisture as part of normal operation. Combined with warm temperatures and airborne particles, buildup inside the system accelerates faster than in a drier climate.
At the end of summer, sludge sitting in the drain line can dry and harden over winter. When the system runs hard again the following season, that hardened blockage produces the drainage problems described above. Homeowners often notice symptoms at the start of a new season, when the system is pushed hardest, but the problem built through the previous season and sat dormant.
Two separate warranties apply to most air conditioner installations. The manufacturer warranty covers defects in the unit itself, not faults caused by poor servicing or normal wear. Routine servicing doesn't require brand authorisation, and under the Consumer Guarantees Act your rights apply regardless of which qualified technician services your unit, provided the work is done competently.
The installer warranty covers the quality of the installation work separately. Before accepting a repair cost, establish which warranty applies and who is responsible.
Refrigerant work carried out by an unqualified person can void the manufacturer warranty. Always confirm a repair technician is qualified before authorising that work.
If a service doesn't resolve what you're seeing, see air conditioner servicing Auckland for what a proper clean covers first.
Yes. Severe mould and grime on the internal fan or coil can restrict airflow to the point where the system shuts down or fails to produce treated air. What presents as a complete breakdown is often a servicing failure. A professional clean restores normal operation in these cases.
Sometimes, but not usually. Most fault symptoms trace back to a dirty filter, coil, or drain line rather than lost refrigerant. MiHT doesn't carry out refrigerant regassing directly, since it requires specific licensing, but as part of a diagnosis we'll tell you honestly if that's what your unit needs and coordinate a qualified refrigerant technician to complete it.
Landlords are responsible for maintaining rental properties in a reasonable state of repair under the Residential Tenancies Act. If a unit stops working, the landlord is generally responsible for restoring it to working order.
Refrigerant work carried out by an unqualified person can void the manufacturer warranty. Always confirm a repair technician is qualified before authorising refrigerant work. Routine servicing isn't subject to the same restriction.
Simple repairs such as control board or fan motor replacements can often be completed in a single visit if parts are available. Refrigerant work requires a certified technician and may involve additional lead time for parts. A condition check gives a clearer picture before repair work begins.
MiHT offers servicing and repair coordination. For faults beyond the scope of a service, MiHT assesses the fault, provides a quote, and manages the repair through qualified contractors, so there's one point of contact for the full process.