Hisense Aircon Error Code 13, Discharge Temperature Too High

Heatwaves have a way of finding the weak spot in any air conditioner. On the day you need cooling most, the outdoor unit stops, the indoor unit blinks, and the room starts warming up again. When the code turns out to be 13, the system is usually telling you something is running too hot.

On many Hisense split systems, Hisense aircon error code 13 means the compressor discharge temperature is too high. Unlike a sensor fault, this code generally means the sensor is working and has measured a real problem. The system then stops the compressor to protect it from overheating.

The cause is often something you can see, like a dirty outdoor coil or a blocked filter. Sometimes, though, it points to a refrigerant problem that needs a licensed technician. Let us work through it.

Hisense code 13 meaning in plain words

Inside the outdoor unit, the compressor pushes hot refrigerant gas out through a pipe called the discharge line. A sensor on that pipe tracks the temperature. If the gas gets hotter than the board allows, the board stops the compressor and shows code 13.

So the code is a protection, not a part failure in itself. It is the system saying that conditions are making the compressor work too hard. If those conditions continue, the compressor could be damaged over time.

Meanings can vary across Hisense model ranges and control boards. Therefore, always check the manual for your model number, which you can find on the rating sticker on the side of the indoor unit.

How the code shows on different Hisense models

Hisense does not use one display style across every range. On a model with a digital display, you may simply see the number on the front panel. On other wall splits, the running or timer light flashes a set number of times, pauses, and repeats.

Counting thirteen flashes is tricky, so watch several cycles before you settle on a number. Ducted and cassette systems usually show the code on the wired controller instead. In addition, some models store recent codes that you can view with a button sequence on the remote.

Whichever way it appears, write it down along with the model number. That simple record saves time when you speak with a technician.

Why would the discharge temperature get too high?

There are three usual suspects with this code. Most technicians think about them in this order, because the simplest causes are often the most common.

Suspect one, a dirty condenser or blocked airflow

The outdoor coil, also called the condenser in cooling mode, has to shed heat into the outside air. When it is coated in dust, pollen, grease or leaves, it cannot do that well. As a result, pressures and temperatures inside the system climb.

A Hisense dirty condenser is very common in Australian backyards. For instance, a unit beside a lawn can collect grass clippings every time the mower goes past. Meanwhile, units in narrow side passages often suck in their own hot exhaust air.

Blocked indoor filters cause similar strain from the other end. With less air moving across the indoor coil, the whole cycle runs less efficiently. So both the indoor and outdoor sides matter.

Suspect two, low refrigerant

When the refrigerant charge is low, the compressor has less gas to move heat with. Because the gas returning to the compressor is not cooling it properly, the discharge temperature rises. Low refrigerant almost always means there is a leak somewhere in the system.

Refrigerant work is tightly regulated in Australia. Only licensed technicians can find leaks, repair them and recharge the system. Owners should never try to open the sealed system.

Suspect three, a sensor reading high

Occasionally, the sensor itself drifts and reports a temperature that is higher than reality. In that case, the system shuts down even though the compressor is fine. A technician can test the sensor against its expected values to rule this in or out.

Hisense low refrigerant signs to watch for

Low refrigerant tends to build slowly, so the signs are easy to miss. If you notice several of these together with code 13, mention them when you book.

• Cooling feels weaker than it used to, especially on hot days
• The unit runs for long periods without reaching the set temperature
• Frost or ice forms on the small pipe at the outdoor unit
• Hissing or bubbling sounds that are new
• Oily marks around pipe joints near the indoor or outdoor unit

Keep in mind that some sounds are normal. Hisense manuals mention water flowing sounds and light cracking from the panel as the plastic expands and contracts. However, a new and persistent hiss is worth reporting.

Hisense compressor overheating and hot weather

Code 13 often appears during long runs of hot weather. That makes sense, because the condenser has a harder time shedding heat when the outdoor air is already very hot. In places like western Sydney, inland Queensland or Perth in summer, the load can be heavy for days.

Hisense manuals also describe operating limits for each model. Outside those limits, protection may stop the unit. So on extreme days, a code might be the system protecting itself rather than a sign that something has broken.

That said, a healthy and clean system usually copes with normal summer heat. If code 13 appears often, there is probably an underlying cause worth finding, such as a dirty coil or a slow leak.

Small habits that ease the load in summer

There are a few simple ways to help your aircon through a heatwave. First, start cooling earlier in the day rather than waiting until the house is already hot. Next, close blinds on sunny windows to reduce heat coming in.

Also, keep the area around the outdoor unit clear and avoid stacking things against it. Shade can help too, as long as it does not block airflow around the unit.

Can code 13 appear in heating mode too?

Yes, although owners tend to link it with summer. In heat mode, the indoor coil does the job of shedding heat into the room. So if the indoor filters are clogged, or furniture blocks the indoor unit, discharge temperature can rise there as well.

Low refrigerant affects heating in the same way it affects cooling. As a result, a slow leak can trigger code 13 on a cold winter evening just as easily. If the code appears in heating, start with the indoor filters and airflow, then book a service if it returns.

Owner checklist for Hisense aircon error code 13

These steps are safe for owners and can sometimes clear an airflow related trip. Stay outside the unit and away from all wiring and pipework.

1. Note the code or the flash count, and which light is flashing.
2. Check the model number on the rating sticker and confirm what code 13 means in its manual.
3. Switch the unit off with the remote, then turn it off at the isolator or breaker.
4. Remove and clean the indoor filters, then let them dry before refitting.
5. Clear leaves, weeds, covers and stored items from around the outdoor unit.
6. Check the remote batteries and confirm the unit is set to cool, with a sensible set temperature.
7. Wait several minutes, restore power, and allow for the start delay and the three minute protection delay.
8. Run the unit in cooling and watch. If code 13 returns, switch off and arrange a service.

Safety note. Never open the outdoor unit, loosen pipe fittings or try to add refrigerant. In Australia, refrigerant handling and electrical repairs must be done by licensed technicians, and opening a sealed system can cause injury.

What a technician looks for

A technician will usually start with the easy wins. They look at the condition of the outdoor coil, the outdoor fan, the indoor coil and the filters. If the coils are dirty, a thorough professional clean may be the first fix.

Next, they check system pressures and temperatures with proper gauges. These readings show whether the refrigerant charge looks correct. If it seems low, the next step is to find and repair the leak before recharging.

Finally, they test the discharge sensor and check the outdoor fan is spinning at the right speed. A slow or failed outdoor fan can cause high discharge temperatures too. Once the cause is fixed, they run the system and confirm the code has cleared.

Along the way, they may also ask about the history of the unit. For example, it helps to know when it was last serviced and whether cooling has faded slowly or stopped suddenly.

Why a top up is not a real fix

Some owners ask whether the system can just be topped up with gas. The trouble is that refrigerant does not get used up in normal running. If it is low, it has leaked out somewhere.

So simply adding refrigerant without finding the leak means the problem will return. A proper repair locates the leak, fixes it, and then recharges the system to the correct amount.

Code 13 compared with other Hisense codes

It helps to know how code 13 sits next to similar codes. On many Hisense models, code 2 is a fault with the discharge sensor itself. Code 13, by contrast, means that sensor is reporting a real high temperature.

Code 15 on some models relates to compressor housing overheat. Meanwhile, code 5 often relates to IPM protection on the outdoor board. Each one points the technician in a slightly different direction, so the exact code matters.

How to stop code 13 coming back

Once the cause has been fixed, good habits help keep the system running cool. Most of them take very little time, and they help with efficiency as well.

• Clean the indoor filters every few weeks during heavy use
• Keep plants, fences and stored items well clear of the outdoor unit
• Point the mower and whipper snipper away from the outdoor coil
• Book a professional service before summer, especially in dusty or coastal areas
• Report weaker cooling early, rather than waiting for a code

In short, a clean and well ventilated system rarely overheats under normal conditions. Regular attention is far easier than dealing with repeated trips in the middle of a heatwave.

Warranty and choosing who to call

If your Hisense unit is still under its manufacturer warranty, contact Hisense first. Your warranty card has the details. Unauthorised repairs may affect your warranty, so that quick check is worth it.

For units outside warranty, an independent technician can help. We are an independent Hisense air conditioner service business, and we are not affiliated with Hisense. We book qualified technicians in VIC, NSW, QLD, WA, SA and the ACT.

The short version

Hisense aircon error code 13 usually means the compressor discharge temperature is too high. The most common causes are a dirty condenser, blocked filters, poor airflow or low refrigerant, with a faulty sensor less common.

Start with clean filters, a clear outdoor unit and a single careful reset. If the code returns, or you notice signs of low refrigerant, book a qualified technician on 03 7048 4120 to find the cause properly.