Hisense Multi Head Split System Service and Maintenance

Some homes simply do not suit a row of outdoor units along the side fence. Townhouses, apartments and narrow blocks often have room for only one condenser. That is where a multi head system earns its place.

A Hisense multi head split system connects one outdoor unit to two or more indoor heads, so each room gets its own control. Servicing one is a little different from servicing a standard split. The technician has several heads, several sets of pipes and one shared outdoor unit to look after.

This page explains how these systems are put together, what a multi split service covers, which problems are common and how to book a qualified technician.

How a Hisense multi head split system is set up

Think of it as a hub and spokes. The outdoor unit is the hub, and each indoor head is a spoke with its own pair of refrigerant pipes and its own communication cable. A larger outdoor unit shares its capacity between all the heads that are running.

Each head can be a wall split, and on some systems a ducted section or a cassette may be part of the mix. Every head has its own filters, coil, fan, drain and sensors. Meanwhile, the compressor, outdoor fan and main control board sit in the shared outdoor unit.

Why the design matters for servicing

Because everything flows through one outdoor unit, a problem outside can affect every room. On the other hand, a dirty filter or blocked drain in one bedroom usually affects only that head. So a good service treats each head as its own job, then checks the shared parts carefully.

What a Hisense multi split service includes

Every technician has their own routine, and the exact steps depend on the system and its condition. Even so, a thorough multi split service usually covers the points below.

At each indoor head

• Removing and washing the filters, and checking them for damage.
• Inspecting and cleaning the indoor coil where access allows.
• Checking the blower wheel for dust and mould, and cleaning it if needed.
• Flushing and testing the drain line and tray.
• Testing the louvres, display, remote and sensors.
• Measuring the air temperature leaving the head in cool and heat modes.

At the shared outdoor unit

• Clearing debris and checking clearances around the unit.
• Cleaning the condenser coil and checking the fins.
• Inspecting the fan blade, motor and mountings.
• Checking electrical connections and signs of corrosion or pests.
• Checking pipe insulation and looking for oil stains that hint at a leak.
• Running all heads together to confirm the system handles full demand.

If the technician finds a refrigerant concern, they will explain it. Any work on the sealed circuit is for a licensed technician only, and it is quoted separately.

Common problems with multi head systems

Multi split systems share many faults with ordinary splits. However, a few issues are specific to the shared design. Knowing them helps you describe the problem when you book.

Mode conflict between heads

On many multi split systems, all heads must run in a compatible mode at the same time. For example, one head in cool and another in heat will clash. The outdoor unit cannot do both, so one head may stop or show a mode conflict indicator. Check your manual to see how your model handles this.

One head performing poorly

Sometimes a single room never gets as cool or warm as the others. This can come from a dirty filter or coil in that head. It can also involve its pipe run, its expansion valve control or its sensor.

Communication codes

Every head talks to the outdoor unit through its own cable. On many Hisense systems, code 36 or a similar communication code points to a lost connection. A damaged cable, a loose terminal or a board fault can all cause it.

Drain problems in upstairs rooms

Heads in upper rooms often have long or awkward drain runs. If a drain sags, blocks or loses its fall, water can back up and drip inside. In addition, ducted or cassette heads with a condensate pump may show code 37 for water overflow on many models.

Owner checks between services

There is plenty an owner can do safely to keep each head running well. These steps also help when something seems wrong.

1. Check that all heads are set to the same mode, such as cool for every room in summer.
2. Replace the batteries in the remote for any head that does not respond.
3. Wash the filters in each head every few weeks during heavy use.
4. Clear leaves and rubbish from around the outdoor unit.
5. Check the drain hose outlet for each head where you can see it, and clear leaves or insects from the end.
6. If a code appears, switch the system off at the isolator or breaker, wait several minutes and restart it.
7. Note which head shows the problem, the code and the model numbers of both indoor and outdoor units.

Remember that after any restart or mode change, the system waits about three minutes before the compressor starts. So give it time before deciding something is broken.

A multi split outdoor unit feeds several refrigerant circuits and runs on mains power. In Australia, only licensed technicians may handle refrigerant, and electrical work needs a licensed professional. Keep covers on and do not loosen pipe fittings or cables at any head.

How often should a multi head system be serviced?

Most households benefit from a professional service at regular intervals, often once a year. However, a multi split system works hard, because one outdoor unit serves the whole home. So if you run several heads every day through summer and winter, more frequent servicing may make sense.

Also consider your location. Coastal homes face salt air on the outdoor coil, and dusty inland areas clog filters quickly. Meanwhile, homes with pets or ongoing renovations collect more dust in every head.

Best times to book

Late winter and early spring are good times to prepare for summer cooling. Likewise, late summer and autumn suit a check before winter heating. Booking outside peak heatwaves and cold snaps also gives you more choice of times.

Signs your multi split needs attention now

• One or more heads blow air that is close to room temperature.
• Water drips from a head or stains appear on the wall below it.
• Musty or mouldy smells when a head starts.
• Codes or flashing lights on any head.
• New rattles, grinding or buzzing from the outdoor unit.
• Ice on the pipes at the outdoor unit or at a head.

If any of these signs appear, start with the owner checks listed above. Then, if the problem stays, switch the affected head off and note what you saw. In particular, turn the whole system off if you notice a burning smell, loud grinding or water near a power point.

Running a multi head system efficiently

How you use the system day to day affects both comfort and wear. A few habits make the shared outdoor unit work less hard. They also help every room reach its set temperature sooner.

• Only run the heads in rooms you are using, because each extra head draws on shared capacity.
• Keep doors closed between rooms with heads running, so each head cools or heats a defined space.
• Avoid big gaps between set temperatures in different rooms.
• Use blinds and curtains on hot afternoons to reduce the load in sunny rooms.
• Use the timer or the ConnectLife app on wifi models to start heads before you get home.

Also, expect some differences between rooms. A head in a west facing bedroom upstairs faces more heat than one in a shaded room downstairs. If the gap seems larger than it used to be, though, mention it to the technician.

What to expect on service day

First, the technician will usually ask about any heads that are giving trouble. Then they work through each indoor head in turn, often laying drop sheets and using a cleaning bag below the unit. That keeps water and dirt off walls and floors.

Next, they move outside to the shared unit. After cleaning and checks, they run every head together and test each one separately. Finally, they explain what they found and point out anything that needs further work.

So it helps to plan access. Move beds, desks or shelves away from the wall below each head where you can. Also make sure the outdoor unit is not locked behind a gate, and keep pets in another room.

Adding or changing heads

Owners sometimes ask whether they can add another head to an existing system. It depends on the outdoor unit, how many ports it has and its total capacity. Only a licensed installer can confirm this using the installation manual for your model.

Similarly, replacing a failed head means matching it to the outdoor unit. Not every indoor unit pairs with every outdoor unit, so the model numbers matter.

Warranty and independent servicing

Hisense offers a manufacturer warranty on new systems, and the terms are on your warranty card and the official Hisense website. If a fault arises during the warranty period, contact Hisense before arranging repairs. Work done by others on a covered fault may affect your claim.

We are independent and not linked to Hisense. Routine cleaning and servicing, plus repairs on systems outside warranty, can be booked with us.

Booking a Hisense multi split service

Call 03 7048 4120 and let us know how many heads you have and which rooms they serve. We then pass the job to a qualified technician in your area across Victoria, New South Wales, Queensland, Western Australia, South Australia or the ACT.

It helps to have the outdoor model number and each indoor model number ready. Also mention any head that is giving trouble, along with its code or symptom. On the day, clear space below each head and make the outdoor unit easy to reach.

Looking after a shared system

A multi head system saves space, yet it relies on one outdoor unit doing the work for the whole house. So each head needs clean filters and a clear drain, and the outdoor unit needs space and a clean coil. Mode conflicts, communication codes and drain problems are the issues owners notice most.

Keep up with the simple owner checks and leave refrigerant and electrical work to licensed professionals. For a full service or a head that keeps playing up, book a qualified technician on 03 7048 4120.