Licensed Lennox technicians servicing Australian homes and businesses. Every model — DC inverter split systems, multi-head splits, ducted inverter, gas ducted heating, and add-on cooling. Same-day service. Upfront pricing. Call 1300 019 320.
Split, Multi-Head, Ducted & Gas Heating
Available in most service areas
OEM-approved replacement components
1300 019 320 — always available
On every installation and repair
Lennox is one of the world's most enduring names in climate control — a company whose history begins not with air conditioning, but with heating. In 1895, Dave Lennox built and patented the world's first riveted steel furnace in Marshalltown, Iowa, establishing a tradition of engineering precision and durability that has defined the brand for 130 years. Lennox has been distributing its HVAC systems in Australia since 1974 — over 50 years of serving Australian homes and businesses with a range that covers split systems, ducted inverter air conditioning, gas ducted heating, and add-on cooling solutions.
What distinguishes Lennox in Australia is the breadth of its range. While most brands offer only refrigerant-based air conditioning, Lennox offers a genuinely complete HVAC solution — DC inverter hi-wall split systems, multi-head split configurations, ducted inverter air conditioning, and uniquely, ducted gas furnaces and add-on cooling — the ability to add refrigerant cooling to an existing Lennox gas ducted heating system through the same vents. This makes Lennox the natural brand of choice for homes that already have Lennox gas heating and want to add summer cooling.
At WTFix Air, our technicians are experienced across the complete Lennox range — DC inverter split systems, multi-head systems, ducted inverter systems, gas ducted heaters, and add-on cooling configurations. We understand Lennox's E-code fault system, iComfort controller architecture, and gas-refrigerant hybrid system design for fast, accurate diagnosis every time.
1895 — Dave Lennox built the world's first riveted steel furnace. Lennox has been a leader in residential HVAC for 130 years and has distributed in Australia since 1974
DC inverter hi-wall splits, multi-head systems, ducted inverter air conditioning, gas ducted furnaces, and add-on cooling — a genuinely complete HVAC range unique in Australia
All Lennox refrigerant-based systems use DC inverter technology — continuously varying compressor speed for faster reach, quieter operation, and lower running costs
Lennox ducted gas furnaces offer up to 10-year parts warranty and can be combined with add-on cooling for whole-home year-round comfort through a single duct network
Lennox's iComfort Wi-Fi controller allows remote programming via smartphone, tablet, or laptop — schedule, monitor, and control your system from anywhere
5-year parts and labour warranty on Lennox residential refrigerant systems. 10-year parts warranty on Lennox gas ducted heating — one of the strongest in Australia
We install, service, and repair the complete Lennox Australia range — from DC inverter split systems for single rooms to gas ducted furnaces and add-on cooling for whole-home year-round comfort.
Efficient Reverse Cycle Split System
Lennox's DC inverter hi-wall split systems are engineered for efficient, quiet reverse cycle heating and cooling in single rooms. Using DC inverter technology in both the compressor and fan motors, Lennox split systems reach the target temperature faster and maintain it more efficiently than fixed-speed alternatives. With whisper-quiet operation, sleep mode, auto-restart, and programmable weekly timer, the Lennox hi-wall split is a reliable and practical choice for Australian homes and apartments. Available in a range of capacities for rooms of all sizes.
Multi-Zone — One Outdoor Unit
Lennox multi-head split systems connect multiple indoor units to a single outdoor compressor — providing independent heating and cooling across multiple rooms without the cost and complexity of a full ducted system. Each indoor unit operates independently, allowing different temperatures in different rooms simultaneously. Indoor units can be a mix of wall-mounted hi-wall splits and other types, offering flexibility for apartments, townhouses, and multi-room residential applications without a ceiling cavity for ducting.
Whole-Home Ducted Air Conditioning
Lennox ducted inverter air conditioning provides whole-home or whole-building comfort through a ceiling-concealed indoor unit connected to a network of ducts and supply grilles. Lennox ducted systems are designed to perform in the harshest Australian conditions — quiet, energy-efficient, and suitable for small and large homes alike. With zoning capability and iComfort Wi-Fi controller compatibility for remote management, Lennox ducted systems offer a complete, concealed climate solution where only the controller and grilles are visible.
High-Efficiency Gas Furnace
Lennox gas ducted furnaces represent the brand's deepest engineering heritage — 130 years of furnace development refined into a range of high-efficiency and mid-efficiency gas heating systems for Australian homes. Lennox gas furnaces deliver powerful, even warmth through a ceiling duct network — faster to heat than reverse cycle systems in very cold conditions, and backed by an industry-leading 10-year parts warranty. Variable-speed motor technology creates the perfect balance of temperature and humidity in every room, enhancing comfort beyond what standard gas furnaces deliver.
Cooling Through Your Existing Gas Ducts
Lennox's add-on cooling is one of the most practical and cost-effective ways to achieve year-round home comfort in Australia. If you already have a Lennox (or compatible) gas ducted heating system, Lennox add-on cooling installs a refrigerant cooling component that delivers cool air through your existing heating vents — one thermostat controls both heating and cooling through the same duct network. No new ductwork, no second system, no additional grilles — add-on cooling is the smart upgrade for homes that already have ducted gas heating.
Compact & Economic Cooling Solutions
Lennox's range includes window/wall air conditioning units and fixed-speed hi-wall split systems for applications where simplicity and economy are the priority over inverter efficiency. Window units offer compact, easy-to-install single-room cooling for apartments, granny flats, and heritage properties where wall penetration for a split system is not possible. Fixed-speed hi-wall splits provide reliable cooling at a lower upfront cost, backed by Lennox's build quality and 5-year warranty.
130 years of HVAC engineering has produced practical, proven technologies that work reliably in Australian conditions — from DC inverter precision to variable-speed gas heating and smart iComfort control.
Lennox's DC inverter compressor continuously varies its operating speed to precisely match the room's heating or cooling demand — eliminating the energy-wasting on-off cycling of fixed-speed compressors. The result is faster temperature reach, more consistent comfort, significantly lower running costs, and quieter operation. DC inverter technology is standard across Lennox's current split system and ducted refrigerant range.
Lennox's high-efficiency gas furnaces use variable-speed motor technology that adjusts fan speed continuously to maintain the exact temperature set — rather than blasting hot air at full speed and then stopping. This creates a more even, consistent warmth throughout the home, reduces the drafts associated with on-off heating cycles, and operates at noticeably lower noise levels than standard single-speed gas furnaces.
The Lennox iComfort Wi-Fi controller allows full remote programming and monitoring of compatible Lennox systems via smartphone, tablet, or laptop from anywhere. Pre-program your home's temperature so you always return to comfort. The iComfort controller also provides system diagnostics and alerts for maintenance reminders — keeping you informed about your system's health between professional service visits.
Lennox's add-on cooling technology is a refrigerant cooling system specifically engineered to integrate with Lennox gas ducted furnaces — sharing the same duct network, the same supply grilles, and a single thermostat for both heating and cooling. The integration between gas heat and refrigerant cooling is seamless — the system automatically switches between modes based on the thermostat setting, delivering the most energy-efficient option for each season without any manual switching.
Lennox split systems are specifically designed with bedroom comfort in mind. Sleep Mode gradually adjusts the set temperature during sleeping hours to prevent over-cooling or over-heating, while simultaneously reducing fan speed to its quietest setting. Lennox's design philosophy prioritises low noise levels across the entire range — a philosophy rooted in 130 years of understanding what people need from their home environment.
Lennox's Australian range is built around energy efficiency at every level — DC inverter compressors for refrigerant systems, high-efficiency gas furnace ratings, X-Eco and sleep modes for split systems, and programmable scheduling via iComfort Wi-Fi to ensure the system only runs when needed. Lennox systems are designed to reduce your electricity and gas bills without requiring any sacrifice in comfort — the brand's core promise since Dave Lennox built his first furnace in 1895.
Installation, annual servicing, and same-day repair for every Lennox model — DC inverter split systems, ducted inverter, gas heating, and add-on cooling.
Expert supply and installation of the complete Lennox range — DC inverter hi-wall split systems, multi-head configurations, ducted inverter air conditioning, gas ducted furnaces, and add-on cooling integration. All installations include site assessment, load calculation, licensed refrigerant and gas work, electrical connection, iComfort controller commissioning, and full system handover. Lennox's 5-year and 10-year warranties maintained on all WTFix Air installations.
Annual Lennox servicing maintains your warranty, keeps the system performing at peak efficiency, and prevents costly breakdowns. Our comprehensive Lennox service covers every component — for refrigerant systems: filter, coil, drain, refrigerant pressure; for gas systems: heat exchanger, burner, flue, ignition, and safety controls. We issue a written service report after every service for your warranty records.
Fast, accurate diagnosis and repair of all Lennox fault codes and error conditions — E0 through E19 on split systems, gas furnace fault indicators, and iComfort controller faults. Our technicians carry Lennox-specific diagnostic equipment and a comprehensive stock of genuine and OEM-approved Lennox replacement parts, completing most repairs in a single same-day visit across both refrigerant and gas heating systems.
Our technicians diagnose and repair every Lennox fault — from a split system not cooling in summer to gas ducted heating failures, error codes, water leaks, and iComfort controller issues.
Lennox split system and ducted air conditioners display E-code fault indicators on the indoor unit's display or controller when the system's self-diagnosis detects a fault. Each code identifies a specific component or circuit fault — from sensor failures and communication errors to refrigerant deficiency and fan motor issues. The table below covers the most common Lennox error codes for residential split and ducted systems in Australia. Always call a licensed technician for accurate diagnosis — error codes have multiple possible causes, and resetting without addressing the fault will cause the code to return and may cause further damage.
| Error Code | Fault Description | Action Required |
|---|---|---|
| E0 | Indoor unit EEPROM error — PCB memory fault | Indoor unit PCB diagnosis and replacement if required |
| E1 | Communication error between indoor and outdoor units | Check wiring and PCB connections — professional diagnosis |
| E3 | Indoor fan speed out of control — fan motor fault | Indoor fan motor diagnosis and replacement if required |
| E4 | Indoor return air temperature sensor fault | Indoor air sensor check and replacement by licensed technician |
| E5 | Indoor coil temperature sensor fault | Coil sensor check and replacement by licensed technician |
| E8 | Freeze protection — indoor coil temperature too low | Check refrigerant charge and airflow — licensed diagnosis |
| E9 | High-pressure switch activated | Refrigerant check, coil cleaning, and fan inspection |
| E10 | Low-pressure switch activated — low refrigerant | Refrigerant leak check and recharge by licensed technician |
| EC | Low refrigerant detected — refrigerant deficiency | Turn off unit — refrigerant leak check immediately required |
| EE | High water level alarm — drain fault (ducted/cassette) | Drain cleaning and condensate pump inspection |
If your Lennox split system is running noticeably longer to reach the set temperature, this typically signals a refrigerant deficiency, a dirty evaporator coil reducing efficiency, or an inverter compressor losing capacity. For gas ducted systems, slow heating can indicate a dirty heat exchanger, a partially blocked flue, or a burner issue — all of which are cheaper to address early.
A Lennox E-code on the indoor unit display or iComfort controller means the self-diagnosis has detected a specific fault. EC and E10 in particular indicate refrigerant conditions that will cause compressor damage if the system continues running. Do not reset and ignore — call us for an accurate diagnosis before the fault worsens.
If your Lennox gas ducted system is running but blowing cold or lukewarm air in heating mode, this indicates a gas supply issue, a faulty ignition component, a tripped safety control, or a heat exchanger fault. Gas system faults should always be diagnosed by a licensed gas technician — do not attempt DIY inspection of burner or heat exchanger components.
Water dripping from the Lennox indoor unit indicates a blocked condensate drain, a frozen evaporator coil from low refrigerant or restricted airflow, or a failed drain pump on a ducted system. For ceiling-mounted ducted units, water leaks can quickly damage ceilings and plasterboard — treat ducted water leaks as urgent repairs requiring same-day attention.
A Lennox iComfort Wi-Fi controller that is frozen, blank, or not responding to input may have a software fault, a communication fault with the indoor unit, or a power issue. Controller faults on Lennox systems are typically resolved quickly by an experienced technician — do not attempt to open or manually reset the controller without professional guidance.
Lennox recommends annual professional servicing to maintain your 5-year refrigerant system warranty and 10-year gas heating warranty. Annual servicing prevents the gradual efficiency loss that accumulates in dirty coils, blocked drains, and low refrigerant — saving significantly on running costs and preventing the expensive breakdowns that develop from deferred maintenance. Book before the peak heating or cooling season for best availability.
Our technicians are experienced across the full Lennox range — DC inverter splits, multi-head systems, ducted inverter, gas ducted furnaces, and add-on cooling. We understand Lennox's E-code fault system, iComfort controller architecture, and gas-refrigerant hybrid system design.
Hi-wall splits, multi-head systems, ducted inverter, gas ducted furnaces, add-on cooling, and window units — we install, service, and repair the complete Lennox residential range across all controller types including iComfort Wi-Fi.
Same-day repair available in most service areas. We carry genuine and OEM-approved Lennox replacement parts for both refrigerant and gas systems — completing most fault code and mechanical repairs in a single visit.
Clear itemised quotes before work begins. No hidden call-out fees. No surprise charges on the invoice. The price we quote is the price you pay — without exception, every time.
Every Lennox installation and repair is backed by our workmanship guarantee. If our work causes an issue, we return and fix it at no additional cost — no conditions, no exceptions.
Our emergency line is open around the clock. For urgent Lennox faults — mid-winter gas heating failure or mid-summer cooling breakdown — call 1300 019 320 any time of day or night.
Everything you need to know about Lennox air conditioning installation, servicing, error codes, gas heating, add-on cooling, and repair in Australia.
Lennox has been distributing HVAC systems in Australia since 1974 — over 50 years of serving Australian homes and businesses. The Lennox brand itself dates to 1895, when Dave Lennox built and patented the world's first riveted steel furnace in Marshalltown, Iowa. That makes Lennox one of the oldest and most enduring names in the global heating and cooling industry — with 130 years of continuous innovation underpinning every product it produces today.
Lennox add-on cooling is a refrigerant air conditioning system specifically designed to integrate with a Lennox (or compatible) gas ducted heating system. The refrigerant cooling unit connects to the existing gas furnace and distributes cool air through the same ceiling duct network and supply grilles already in place for heating — one thermostat controls both modes. There is no need for additional ductwork, new grilles, or a separate outdoor unit for the cooling component. It is the most cost-effective way to achieve whole-home year-round comfort for homes that already have Lennox gas ducted heating.
EC on a Lennox split system or ducted air conditioner indicates a low refrigerant condition — the system has detected that the refrigerant charge is below the safe operating level. This almost always means there is a refrigerant leak somewhere in the system. Turn the unit off immediately and do not continue operating it — running a system with low refrigerant causes compressor damage that is very expensive to repair. Call us on 1300 019 320 for a same-day leak check and recharge.
Lennox offers a 5-year parts and labour warranty on residential refrigerant air conditioning systems — split systems, multi-head, and ducted inverter — purchased and installed through authorised dealers in Australia. For Lennox gas ducted heating systems, Lennox offers a 10-year parts-only warranty — one of the longest gas heating warranties available in Australia. To maintain warranty validity, systems must be installed by a licensed technician and serviced annually by a qualified professional. We provide a written service record after every annual service.
Lennox recommends annual professional servicing to maintain warranty validity and peak performance. For gas ducted heating systems, annual servicing is particularly important — gas heat exchangers, burners, and flue systems need professional inspection each year to ensure safe and efficient operation. Refrigerant system filters should be cleaned by the user every 2 to 4 weeks during heavy-use periods. Annual professional servicing covers the components that users cannot safely access — coil, refrigerant circuit, drain, and all electrical or gas system components.
Common causes include a gas supply interruption (check the gas meter and other appliances), a faulty ignition component preventing the burner from lighting, a tripped high-temperature safety limit switch due to restricted airflow, or a heat exchanger fault. Gas system faults should always be diagnosed by a licensed gas technician — do not attempt to inspect the burner or heat exchanger yourself. Call us on 1300 019 320 for a same-day gas heating diagnosis.
Yes — we supply, install, service, and repair the complete Lennox Australia range, including DC inverter hi-wall split systems, multi-head configurations, ducted inverter air conditioning, gas ducted furnaces, and add-on cooling integration. We are licensed for both refrigerant and gas work, and we provide free in-home assessments and written quotes with no obligation. Call 1300 019 320 or book online today.
In some cases, yes — Lennox add-on cooling can be compatible with selected other brands of gas ducted furnaces, depending on the existing system's configuration, capacity, and duct layout. The key requirement is that the existing ducting and airflow are adequate to handle the combined heating and cooling demands. Our technicians will assess your existing system during a free in-home consultation and advise whether add-on cooling is compatible and practical for your home.
Free in-home assessments • Free installation quotes • All Lennox models serviced • Same-day repairs • 24-hour emergency line. WTFix Air — your trusted Lennox specialists.