Licensed Hitachi technicians servicing Australian homes and businesses. airHome 400, airHome 500, airHome 600, S-Series, airCore 700 ducted, and multi-split RAM systems. Same-day service. Upfront pricing. Call 1300 019 320.
airHome 400, 500, 600, S-Series & airCore 700
Available in most service areas
OEM-approved replacement components
1300 019 320 — always available
On every installation and repair
Hitachi Cooling & Heating has over 80 years of experience in climate control engineering — and its Australian residential range reflects that accumulated expertise in technologies that address the real practical challenges of home air conditioning ownership. In Australia, Hitachi Cooling & Heating products are manufactured and sold by the Bosch Home Comfort Group, which holds the trademark licence from Hitachi, Ltd. This means you get Hitachi’s proven air conditioning technology backed by Bosch’s global manufacturing standards and Australian service network.
The defining technology of the Hitachi residential range is FrostWash™ — a self-cleaning system that cools the indoor heat exchanger to -15°C, causing moisture to freeze and trap accumulated dust, mould, bacteria, and viruses in the frost layer. When the frost melts, it flushes these impurities hygienically through the drain pan. Lab testing shows FrostWash reduces bacteria on the heat exchanger by 91%, mould by 87%, and viruses by 99%. Systems fitted with FrostWash are three times better at maintaining airflow performance over time than systems without it. Combined with Mould Guard (post-operation drying), SafeGuard System (outdoor unit protection), and the airCloud Go smart app, Hitachi delivers a self-maintaining system that genuinely protects your investment.
At WTFix Air, our technicians are experienced across the complete Hitachi residential range — airHome 400, airHome 500, airHome 600, S-Series split systems, airCore 700 ducted systems, and RAM R32 multi-split configurations. We understand FrostWash technology, Cascade Vector DC Inverter architecture, and Hitachi’s full fault code system for accurate same-day diagnosis.
Over 80 years of climate control engineering — Hitachi Cooling & Heating, manufactured and sold by Bosch Home Comfort Group as a trademark licensee of Hitachi, Ltd
Cools heat exchanger to -15°C — frost traps dust, mould (87% reduction), bacteria (91%), and viruses (99%). Systems with FrostWash are 3× better at maintaining airflow than those without
6-year parts and labour warranty on the full airHome range and airCore 700 ducted system — above the 5-year standard offered by most competing brands in Australia
Microchip-controlled compressor with split rotor and displaced electrical poles — electromagnetic noise suppression for quieter, more efficient low-speed operation
Full remote control, Smart-Fence geofencing (auto on/off by location), energy cost estimator, weekly scheduling, and Alexa/Google Home voice control
The Hitachi airHome 500 series carries a CHOICE Recommended rating — one of Australia’s most trusted independent product endorsements for the residential air conditioning category
We install, service, and repair the complete Hitachi residential range — airHome 400, 500, and 600 split systems, S-Series, airCore 700 ducted with zone control, and RAM R32 multi-split systems.
Reverse Cycle Entry Split System
The Hitachi airHome 400 is Hitachi’s entry reverse cycle split system — delivering reliable year-round heating and cooling with FrostWash self-cleaning technology (manual activation), an air purifying filter, Eco mode for energy-conscious operation, and a comprehensive 6-year parts and labour warranty. The airHome 400 is the practical choice for households who want Hitachi’s core FrostWash technology and long warranty at a competitive price, without the additional smart features of the 500 and 600 series. R32 refrigerant. Available from 2.5kW to 7.0kW.
CHOICE Recommended Cooling-Only Split
The Hitachi airHome 500 is a CHOICE Recommended cooling-only split system — an independent endorsement from one of Australia’s most trusted consumer product testing organisations. The airHome 500 features automatic FrostWash (IDU), the ViroSense Z1 filter (99% effective against Influenza A and bacteria), Human Sensor for occupancy-based energy saving, built-in Wi-Fi as standard, SleepSense automated overnight comfort mode, and Mould Guard post-operation drying. R32. 6-year warranty. Available from 2.5kW to 7.0kW.
Flagship Reverse Cycle Split System
The Hitachi airHome 600 is Hitachi’s flagship residential split system — the most feature-complete and technically advanced model in the airHome range. It adds IDU and ODU FrostWash (both indoor and outdoor unit self-cleaning), the Intelligent Image Sensor (detects number of people, location, and activity to adjust cooling and save energy), AQtiv-Ion ioniser (99.9% reduction of COVID virus particles in lab testing), ViroSense Z1 filter, Mould Guard, built-in Wi-Fi, Smart-Fence geofencing, and SleepSense mode. R32. 6-year warranty. Available from 2.5kW to 7.0kW.
High-Capacity Reverse Cycle Split
The Hitachi S-Series is Hitachi’s high-capacity wall-mounted split system for larger residential and light commercial spaces — available in 5.0kW and 8.0kW configurations with R32 refrigerant and FrostWash self-cleaning technology. The S-Series delivers the same FrostWash core technology as the airHome range in a robust high-capacity package, with the Eco Motion occupancy sensor for automatic temperature adjustment when the room becomes vacant. Ideal for large open-plan living areas, home offices, and commercial installations needing more output than the standard airHome 400/600 range. 6-year warranty.
Whole-Home Ducted with FrostWash
The Hitachi airCore 700 is Hitachi’s high-static inverter ducted system — delivering whole-home comfort through ceiling-concealed ducts with the airCore 700’s unique inclusion of FrostWash self-cleaning on the indoor unit, a backlit coloured controller, Night Quiet Operation mode, and Power Saving setting. Available from 7.2kW to 16kW in single-phase configurations, with three-phase options at 10kW and above. Optional zone control kit and optional Wi-Fi module. Compact low-profile indoor unit. R32. 6-year warranty. The only ducted system in Australia that brings FrostWash into the ceiling.
Multi-Zone — One Outdoor Unit
Hitachi’s RAM R32 Residential Mini VRF multi-split system connects up to five indoor units to a single outdoor compressor — delivering independent heating and cooling across multiple rooms for apartments, townhouses, and multi-room homes. Indoor unit options include wall-mounted splits, ducted ceiling units, ceiling cassettes, and floor-mounted units — mix any combination to suit any room. Each indoor unit operates independently. All units manageable via the airCloud Go app for combined scheduling and energy monitoring. R32 throughout. 6-year warranty.
Over 80 years of development has produced a set of practical technologies that genuinely solve real-world air conditioning problems — from FrostWash self-cleaning and Mould Guard drying to SafeGuard outdoor protection and airCloud Go Smart-Fence.
Hitachi’s FrostWash is the most thoroughly documented self-cleaning technology in the residential air conditioning market. When activated, the system cools the indoor heat exchanger to -15°C — causing moisture in the air to freeze onto the coil surface. As the frost forms, it physically lifts and traps accumulated dust particles, mould spores, bacteria, and virus particles. Once an adequate frost layer has formed, the system melts the ice, flushing all trapped contaminants hygienically through the condensate drain. The coil is then dried thoroughly before normal operation resumes. Independent lab testing confirms FrostWash reduces bacteria on the heat exchanger by 91%, mould by 87%, and viruses by 99%. Hitachi’s own testing shows systems with FrostWash are three times better at maintaining airflow performance over time than those without it. First introduced in Japan in 2017.
Hitachi’s Mould Guard function addresses the single most common cause of musty odours from split systems: the residual moisture left on internal components after a cooling cycle. When the airHome is switched off, Mould Guard automatically continues running the indoor fan to circulate ambient air through the internal components, drying the heat exchanger and surrounding surfaces. This removes the humid, dark environment that mould and bacteria require to establish and grow. Mould Guard works continuously after every cooling session to keep the system’s interior dry and odour-free between FrostWash cycles and annual professional services.
Hitachi’s SafeGuard System is a combination of electrical and mechanical protections applied to the outdoor unit to extend its service life in the demanding Australian climate. Every Hitachi system sold in Australia has been tested for extreme weather including heat and freezing shock, extreme humidity, torrential rain, voltage surges, and lightning strike impact. The SafeGuard System adds a 3-minute delay circuit that prevents damage from multiple rapid power-cycle restarts during power cuts, an ODU valve cover that channels water away from critical electrical components, and voltage surge protection. Together, these make Hitachi outdoor units among the most weather-resilient in the Australian residential market.
Hitachi’s Cascade Vector DC Inverter uses a microchip to precisely control compressor speed, combined with a split rotor design that uses displaced electrical poles to achieve electromagnetic noise suppression. The result is a compressor that operates more quietly at low speeds — the speed at which a system runs for most of its operational life when maintaining a target temperature — while optimising energy efficiency at the same time. This technology is the engineering foundation of the airHome range’s quiet reputation and its strong energy star ratings in the Australian market.
Hitachi’s airCloud Go app provides complete remote management of compatible Hitachi systems — temperature, mode, fan speed, weekly scheduling, and real-time energy cost estimation via the built-in Energy Cost Estimator. Smart-Fence geofencing uses your smartphone’s location to automatically turn the system on as you approach home and off as you leave — eliminating wasted energy and ensuring you arrive at a comfortable temperature. Compatible with Amazon Echo and Google Home for voice control. The airCloud Go adapter (sold separately on some models) connects to the existing indoor PCB without any wiring modifications.
Hitachi’s airHome 500 and 600 include the ViroSense Z1 filter — an air purification filter that has achieved 99% effectiveness against Influenza A virus (H3N2) in independent testing by the Japan Textile Product Quality and Technology Center, and 99% effectiveness against Staphylococcus aureus and E.coli bacteria. The airHome 600 adds the AQtiv-Ion ioniser, which Hitachi laboratory testing at Nara Medical University demonstrated achieves a 99.9% reduction in COVID virus particles. Together, ViroSense Z1 and AQtiv-Ion represent the most comprehensive air quality protection available in the Hitachi residential range.
Installation, annual servicing, and same-day repair for every Hitachi model — from airHome split systems to airCore 700 ducted systems and RAM multi-split configurations across Australia.
Expert supply and installation of the complete Hitachi residential range — airHome 400, 500, and 600 split systems, S-Series, airCore 700 ducted systems with zone control, and RAM R32 multi-split configurations. All installations include site assessment, load calculation, licensed refrigerant and electrical work, airCloud Go commissioning and Smart-Fence setup, and full system handover. Hitachi’s 6-year parts and labour warranty fully maintained on all WTFix Air installations.
Annual Hitachi servicing maintains your 6-year warranty, supports FrostWash effectiveness, and verifies the R32 refrigerant circuit is correctly charged. Our comprehensive Hitachi service covers every component — FrostWash cycle test, ViroSense Z1 filter inspection, AQtiv-Ion ioniser check (airHome 600), Mould Guard function test, condensate drain, fan motors, and all electrical connections. Written service report issued after every visit for your warranty records.
Fast, accurate diagnosis and repair of all Hitachi fault codes — E1 through E6, temperature sensor codes, communication errors, fan motor codes, and pressure protection codes — across airHome 400, 500, 600, S-Series, airCore 700 ducted, and RAM multi-split systems. Our technicians carry Hitachi-specific diagnostic equipment and genuine Hitachi replacement parts including PCBs, sensors, FrostWash components, fan motors, and airCloud Go modules. Most repairs completed in a single same-day visit.
Our technicians diagnose and repair every Hitachi fault — from a split system not cooling to airCore 700 ducted errors, FrostWash issues, water leaks, and airCloud Go connectivity faults.
Hitachi air conditioners display fault codes on the indoor unit’s control screen when the self-diagnosis detects a problem. On outdoor units, fault codes appear on a panel located behind a detachable door. Hitachi uses a consistent error code language across its airHome and airCore ranges, and the majority of codes are consistent across different regions and model families. E-prefix codes typically indicate sensor faults and communication errors; pressure and motor protection events use numeric codes. Indoor units can be accessed by a licensed technician who can connect diagnostic equipment to read live and stored fault histories for accurate diagnosis. Always call a licensed technician for accurate diagnosis and repair — Hitachi fault codes have multiple possible causes and should not be reset without identifying and resolving the underlying fault first.
| Error Code | Fault Description | Action Required |
|---|---|---|
| E1 | Indoor temperature sensor fault — sensor disconnected or defective | Sensor wiring check and replacement by licensed technician |
| E2 | Indoor evaporator coil temperature sensor malfunction | Coil sensor inspection and replacement if required |
| E3 | Communication failure between indoor and outdoor units | Check communication cables and both PCBs — professional diagnosis |
| E4 | Outdoor fan motor fault — motor not operating correctly | Fan motor inspection, obstruction check, and diagnosis |
| E5 | Outdoor unit discharge temperature sensor fault | Discharge sensor diagnosis and replacement |
| E6 | EEPROM / memory chip fault on indoor PCB | Indoor PCB diagnosis and replacement by licensed technician |
| E7 | Indoor fan motor fault — indoor unit fan not operating | Indoor fan motor inspection and diagnosis |
| EA | Outdoor ambient temperature sensor open or short | Outdoor temperature sensor check and replacement |
| P1 | High refrigerant pressure protection event | Turn off unit — outdoor coil cleaning and refrigerant check |
| P2 | Low refrigerant pressure — refrigerant deficiency detected | Turn off unit immediately — refrigerant leak check required |
If your Hitachi airHome is taking noticeably longer to reach the set temperature, this typically signals a refrigerant deficiency, a dirty heat exchanger coil reducing efficiency, a FrostWash component that has failed (reducing the system’s self-cleaning ability over time), or a compressor losing capacity. Early diagnosis prevents a developing fault from becoming an expensive repair and keeps your 6-year warranty intact.
A Hitachi error code on the indoor unit’s control screen or remote controller means the system’s self-diagnosis has detected a specific fault. P1 and P2 in particular indicate refrigerant pressure conditions that cause compressor damage if the system continues operating. Do not reset and ignore — call us for an accurate same-day diagnosis.
If your Hitachi airHome is producing a musty or mouldy odour despite the FrostWash system being active, this indicates either that the FrostWash cycle has developed a fault and is no longer completing correctly, or that the degree of build-up exceeds what FrostWash can address without a professional deep clean. Annual professional servicing includes a FrostWash function test and thorough coil cleaning to restore full performance.
Water dripping from a Hitachi indoor unit indicates a blocked condensate drain (sometimes caused by the FrostWash process dislodging accumulated debris into the drain pan), a frozen evaporator coil from low refrigerant or restricted airflow, or a failed drain pump on an airCore 700 ducted system. Treat any water leak as an urgent same-day repair to prevent ceiling and floor damage.
If your Hitachi system is no longer appearing in the airCloud Go app or Smart-Fence is not responding, this may indicate a Wi-Fi module fault, a PCB communication issue, or a router change needing reconfiguration. Our technicians diagnose both hardware faults and network configuration issues in a single visit, restoring full airCloud Go and Smart-Fence functionality.
Annual professional servicing is required to maintain Hitachi’s 6-year warranty. Annual servicing covers a FrostWash function test and cycle completion, ViroSense Z1 filter inspection, R32 refrigerant circuit check, condensate drain, Mould Guard function test, and fan motor inspection. Between annual services, the standard pre-filter should be cleaned every 2 weeks during heavy-use periods. Book before peak season for best availability.
Our technicians are experienced across the full Hitachi range — airHome 400, 500, 600, S-Series, airCore 700 ducted, and RAM multi-split. We understand FrostWash technology, Cascade Vector DC Inverter architecture, ViroSense Z1/AQtiv-Ion systems, and Hitachi’s full fault code architecture.
airHome 400, 500, 600, S-Series, airCore 700 ducted, RAM multi-split, and cassette units — we install, service, and repair the complete Hitachi residential and light commercial range with genuine Hitachi parts throughout.
Same-day repair available in most service areas. We carry genuine and OEM-approved Hitachi replacement parts — completing most fault code and mechanical repairs in a single visit including PCBs, sensors, FrostWash components, fan motors, and airCloud Go modules.
Clear itemised quotes before work begins. No hidden call-out fees. No surprise invoice charges. The price we quote is the price you pay — without exception, every time.
Every Hitachi 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 Hitachi faults during peak summer heat or unexpected winter heating failures — call 1300 019 320 any time of day or night.
Everything you need to know about Hitachi air conditioning installation, FrostWash, servicing, error codes, warranties, and repair in Australia.
FrostWash works by cooling the indoor heat exchanger down to -15°C — well below freezing. Moisture naturally present in the air freezes onto the coil surface, and as the frost layer forms, it physically lifts and traps accumulated dust particles, mould spores, bacteria, and viruses from the coil surface. Once sufficient frost has built up, the system switches off the refrigeration and allows the ice to melt at room temperature. The meltwater — carrying all the trapped contaminants — drains hygienically through the condensate drain pan. The system then dries the coil before resuming normal operation. Independent testing confirms FrostWash reduces bacteria by 91%, mould by 87%, and viruses by 99%, and systems with FrostWash are three times better at maintaining airflow performance over time. FrostWash was first introduced in Japan in 2017 and is now available across Hitachi’s full Australian residential range.
All three share R32 refrigerant, FrostWash, and Hitachi’s 6-year warranty. The airHome 400 is the entry reverse cycle model with manual FrostWash and an air purifying filter. The airHome 500 is cooling-only and adds automatic FrostWash, the ViroSense Z1 filter (99% effective against Influenza A), Human Sensor occupancy detection, built-in Wi-Fi, SleepSense, and Mould Guard — it carries a CHOICE Recommended rating. The airHome 600 is the flagship reverse cycle model, adding both IDU and ODU FrostWash (indoor and outdoor unit), the Intelligent Image Sensor (detects people, location, and activity), AQtiv-Ion ioniser (99.9% COVID virus reduction in lab testing), Smart-Fence geofencing, and the most complete air quality package available in the Hitachi residential range.
Mould Guard is an automatic function that runs after the airHome is switched off. It continues operating the indoor fan at a gentle speed to circulate ambient air through the unit’s internal components, drying out the residual moisture that accumulates on the heat exchanger and in the drain pan during cooling. Without Mould Guard (and without FrostWash), this moisture provides the humid, dark environment in which mould and bacteria rapidly establish — producing the musty odours that are the most common complaint from air conditioning users. Mould Guard runs after every cooling session automatically, requiring no user input, and works in combination with FrostWash to keep the system’s interior clean and odour-free.
E3 on a Hitachi air conditioner indicates a communication failure between the indoor and outdoor units — the signal transmitted along the interconnecting communication cable between the two units is not being received correctly. This is typically caused by a damaged or disconnected communication cable, a wiring fault introduced during installation or subsequent maintenance, or a PCB failure on either the indoor or outdoor unit. E3 requires a licensed technician to inspect the full communication circuit and identify whether the fault is in the wiring, the indoor PCB, or the outdoor PCB. Call us on 1300 019 320 for same-day diagnosis.
The Hitachi airCore 700 is Hitachi’s high-static inverter ducted system for whole-home air conditioning. What makes the airCore 700 unique is that it is the only ducted system in Australia to incorporate FrostWash self-cleaning technology on the indoor unit — bringing the same 91% bacteria reduction and 3× airflow maintenance performance of the split system airHome range to the ducted format. The airCore 700 features a backlit coloured controller, Night Quiet Operation mode, and Power Saving setting. Available from 7.2kW to 16kW, with optional zone control and Wi-Fi module. 6-year parts and labour warranty.
Hitachi offers a 6-year parts and labour warranty on the full airHome split system range (airHome 400, 500, 600) and the airCore 700 ducted system. This is one year longer than the 5-year warranty standard offered by most competing brands in the Australian residential market. The warranty covers manufacturing defects in materials and workmanship for both parts and labour for six years from installation. To maintain the warranty, the system must be installed by a licensed refrigeration technician and serviced annually by a qualified professional. We provide a written service record after every annual service.
Annual professional servicing is required to maintain Hitachi’s 6-year warranty and keep the system performing at peak efficiency. Between annual services, the standard pre-filter should be cleaned approximately every two weeks during heavy-use periods — the FrostWash system is not a substitute for professional coil cleaning. Annual professional servicing covers a FrostWash function test, ViroSense Z1 filter inspection, R32 refrigerant circuit check, condensate drain inspection and clean, Mould Guard function test, and fan motor electrical inspection. We provide a written service report after every visit.
Yes — we supply, install, service, and repair the complete Hitachi residential range including airHome 400, 500, and 600 split systems, S-Series, airCore 700 ducted systems with zone control, and RAM R32 multi-split configurations. We commission the airCloud Go app and Smart-Fence geofencing as part of every installation, and maintain Hitachi’s full 6-year warranty on all installations. We provide free in-home assessments and written quotes with no obligation. Call 1300 019 320 or book online today.
Free in-home assessments • Free installation quotes • All Hitachi models serviced • Same-day repairs • 24-hour emergency line. WTFix Air — your trusted Hitachi specialists.