Hisense Portable Air Conditioner Not Cooling (10 Issues Fixed!)

Did you know that a staggering 80% of Hisense air conditioner users encounter cooling issues within the first year? It’s frustrating to invest in a cooling unit only to find it failing when you need it most. If your Hisense air conditioner is not cooling as expected, you’re not alone. In this post, we’ll delve into common reasons why your Hisense AC might be struggling to keep things cool and provide practical solutions to get it back on track.

From simple troubleshooting steps like checking for airflow obstructions to more complex issues such as refrigerant leaks or compressor malfunctions, we’ve got you covered. Whether you’re a seasoned DIY enthusiast or new to handling appliance glitches, these tips will help you understand and address the problem effectively. Stay tuned for expert advice on reviving your Hisense air conditioner and keeping your cool all summer long.

A Hisense portable air conditioner is a fantastic choice for single rooms, apartments, and frequent travelers because of its mobility, easy installation, and energy efficiency. But more than that, you wouldn’t want a Hisense portable air conditioner not cooling, which can disappoint. 

Generally, your Hisense portable air conditioner won’t cool due to failed power, a smaller cooling capacity, a thermostat fault, restricted airflow, air leakage, obstructed fan, a non-running compressor, full internal water tank, an error code, or a low refrigerant. 

Out of the ten reasons lies the explanation why your portable Hisense Ac won’t blow cold. The good news is that all these issues have solutions; even better, you don’t need an expert to troubleshoot most of them. 

I’ll help you recognize the likely reason behind the air conditioner issue issues and act on it accordingly. Let’s dive in!

Hisense portable air conditioner not cooling

In a hurry? Below is a quick troubleshooting guide for a Hisense portable air conditioner that won’t cool: 

Troubleshooting Guide for Hisense Portable Air Conditioner Not Blowing Cold Air

 Likely CauseRecommended Fix 
1.Failed Power Check if there is an outage and ensure the power plug is firmly plugged in, the electric outlet is working, and the unit is on 
2.Smaller Cooling CapacityGet a big-capacity portable air conditioner if the existing one is undersize
3.Thermostat Fault Set the thermostat below the room temperature, choose the Cool Mode, and if the thermostat is faulty, replace it 
4.Restricted Airflow Remove any sucked curtains and dust on the grille, clean a dirty air filter and replace a defective one, unblock the exhaust vent, and thaw out iced-up coils 
5.Air Leakage Insulate leaky air hoses and windows, and if the windows are open, shut them 
6.Obstructed Fan Clear any obstructions on the fan 
7.Non-Running Compressor Check for possible power or airflow problems or a leaky hose and fix them 
8.Full Internal Water Tank Drain the full tank 
9.Error Code Identify the cause of the error code (fab, drainage, or refrigerator issue) and fix it 
10.Low Refrigerant Call Hisense or the local HVAC expert 

Why Is My Hisense Portable Air Conditioner Not Cooling?

Generally, at least ten issues can stop a Hisense portable air conditioner from cooling. These issues include:

1. Failed Power 

Realistically, you can’t expect your portable air conditioner to do anything without a power supply. It won’t turn on, which could be why your Hisense portable AC won’t blow cold. 

Some of the issues that could prevent the AC from turning on include the following: 

  • Power outage 

  • Failing to turn on the AC 

  • Loose/plugged power cord 

  • Defective electric outlet


Start by checking for power, as there could be an outage. If it’s not an outage, ensure the power cord is firmly plugged into the socket and turned on. If the AC still won’t turn on, move it to another socket. 

It could be that the original socket is defective. And if it still won’t turn on, take it to an HVAC expert. 

why is my Hisense portable air conditioner not cooling

2. Smaller Cooling Capacity 

All air conditioners come with a specific cooling capacity which makes them capable of cooling up to a particular floor area. The cooling capacity (or BTU) should match the floor area; the AC won’t cool the space if it’s lower. 

Some issues, however, such as too much heat, too many people, and heavy shading, can affect the BTU requirements. Let’s talk about that under the fix.


Ensure you match your portable ACs BTU with the correct floor size. Here’s a table to use: 

BTU Rating Maximum Cooled Area 
5,000 BTU 150 sqft
6,000 BTU 250 sqft
7,000 BTU300 sqft
8,000 BTU350 sqft
9,000 BTU 400 sqft
10,000 BTU 450 sqft
12,000 BTU 550 sqft
14,000 BTU 700 sqft
18,000 BTU1,000 sqft
21,000 BTU 1,200 sqft
23,000 BTU1,400 sqft
24,000 BTU1,500 sqft

If the AC’s cooling capacity or BTU does not match the floor area, get another AC with a bigger capacity. Remember, however, to:

  • Reduce the BTU by 10% for a heavily shaded room 

  • Raise the BTU by 10% for an extra sunny room 

  • Raise the BTU by 600 for every extra person where there are more than two people in a room 

  • In the case of a kitchen, raise the BTU by 4,000

3. Thermostat Fault 

Your Hisense portable AC won’t blow cold air if the thermostat is not working. Issues to check here include:

  • Higher thermostat setting – where the thermostat reading is more than the room temperature at the time

  • Wrong mode, especially heat mode 

  • Defective thermostat 


Check the thermostat reading to ensure it’s lower than the room temperature. If it is not, then lower it. Then check the temperature hose to ensure the thermostat is on Cool Mode.

But if the thermostat is malfunctioning, replace it or ask for an HVAC expert’s help. 

4. Restricted Airflow 

Good airflow is paramount for cooling to take place. If hot air won’t go out or cool air won’t circulate your portable AC won’t blow cold air. Some of the issues that could contribute to that include:

  • Obstructed air intake – The air intake should be free from obstructions such as sucked curtains, furniture, and dust for smooth airflow. So, check for those blockages around the grille. 

  • Dirty or damaged air filter – The air filter may also block dust and dirt accumulation, which restricts airflow once that happens. Expect a damaged air filter also to restrict airflow. 

  • Blocked vent – Your portable AC should vent out hot air to properly cool your space. So, the exhaust vent should be clear of clogs, kinks, and other blockages. 

  • Iced evaporator coils – Frozen evaporator coils also restrict airflow; when they do, your portable AC cannot blow cold. 


Check for any sucked-in curtains/blinds in the air intake grille or furniture around and remove them. Also, inspect the grille for dust and dirt clogging and clean the grille.

Remember, most air intake grills are removable to allow you to wash them separately. 

Wash the air filter if it’s dirty and replace it if it appears damaged. Clear any blockages on the exhaust vent and unplug the AC to thaw out frosty evaporator coils naturally. 

Hisense portable air conditioner not blowing cool air

5. Air Leakage 

Your air conditioner will have a challenge cooling your space if cold air is leaking out or hot air is leaking in. For example, hot air may leak in if there are open windows around the AC, while cold air may leak out through the vent.

So, you should inspect the two when suspecting an air leakage. 


Shut the windows adjacent to the AC and possibly use curtains or blinds to insulate them. If the vent hose leaks, insulate it by wrapping bubble wrap, foam, or fiberglass shell around it. 

6. Obstructed Fan 

Your portable Ac won’t blow cold air if the fan doesn’t spin. That usually happens when there’s an obstruction. Just shine a spotlight on the fan grilles to see if anything obstructs them.


Remove any obstruction from the fan grille to ensure the fan is spinning without hiccups. 

7. Non-Running Compressor 

The air conditioner depends on a running compressor to cool your space. So, you must ensure that’s the case, which means listening to the compressor kick.

That happens after 5 minutes when the compressor goes through a delay phase. If the compressor doesn’t kick after the delay phase, check for any of these issues:

  • Power issues 

  • Poor airflow 

  • Leaky vent 


Check if your AC has power, ensure no obstructed airflow and insulate a leaky hose. 

8. Full Internal Water Tank 

Over time, the portable AC’s water tank fills up, and when it does, it prevents the air conditioner from cooling. You can tell if that’s the case if the AC suddenly stops or won’t stop beeping or flashing. 


Take out the portable Ac do drain the water tank using its drain hose. You can also drain it in the toilet or bathtub. 

9. Error Code 

Some error codes, especially those indicating a problem with the fan drainage and refrigerant, can prevent the air conditioner from cooling. So, check if there’s any error code popping up and try to find the reason behind it. 


Try to find the meaning of the error code and fix it accordingly. And as I mentioned, it often relates to an issue with the fan, drainage, and refrigerant. 

how to fix portable air conditioner not cooling

10. Low Refrigerant 

The refrigerant’s job is heat absorption and dispensing out of the cooling chamber, and that allows the AC to cool. Issues, however, like AC damage and wrong installation can cause leakage, and once that happens, the AC cannot cool. 


This is one troubleshooting you shouldn’t do. Instead, call Hisense or the local expert. They’ll help you fix the leakage source and refill the refrigerant. 

People Also Ask 

1. Why Is My Portable Air Conditioner Not Cooling?

Your portable air conditioner is not cooling because there’s no power, the thermostat is set wrongly or faulty, restricted airflow, or the Ac has a smaller cooling capacity. 

It could also be due to air leakage through the windows and vent, a blocked fan, or low refrigerant. 

2. Why Is My Hisense Portable Ac Not Blowing Cold?

Your Hisense portable AC won’t blow cold because of a high thermostat setting (higher than the room temperature), the wrong thermostat mode, or a malfunctioning thermostat. 

It could also be due to blocked airflow – related to a dirty air filter, obstructed vent, or iced evaporator coils. Other issues include low refrigerant, error codes, and obstructed fans. 

3. How Do I Reset My Hisense Portable Air Conditioner?

You can reset a portable Hisense air conditioner by pressing the mode + fan buttons for about 3 seconds simultaneously. 

That should trigger the Reset code on display, and once you release the buttons, the air conditioner should go back to default settings. 

Closing Thought On Troubleshooting a Hisense Portable Air Conditioner Not Cooling:

Consider the discussed ten issues when your Hisense portable AC won’t blow cold air. That includes lack of power, lower BTU, poor airflow, air leakage, blockade fan, non-kicking compressor, undrained water tank, error code, and refrigerant leakage. 

Apart from a refrigerant leakage that needs an expert’s help, you can do other troubleshooting, and this guide can help you get started. 

Identifying Common Issues

Non-operational Units

If your Hisense air conditioner is not cooling, start by checking the power supply. Ensure that the unit is properly plugged in and verify if the circuit breaker has tripped. A lack of power can cause the unit to malfunction.

Partial Cooling

When experiencing partial cooling, cleaning the air filters can significantly improve airflow. Check if the thermostat is set to the desired temperature and inspect for any obstructions around the outdoor unit. Proper airflow is crucial for efficient cooling.

Blank Display Screen

A blank display screen could indicate a power issue or loose connections between the display and control board. Confirm if the unit is receiving power and check for any loose connections that may be affecting its functionality. If necessary, consider replacing faulty display components to restore proper operation.

Restricted Airflow

Restricted airflow can impede your air conditioner’s ability to cool effectively. Clean or replace clogged air filters regularly to maintain optimal performance. Moreover, remove any blockages from vents or ducts that could obstruct airflow within your home. Lastly, ensure that furniture or other objects are not obstructing airflow around both indoor and outdoor units.

Regular maintenance plays a significant role in ensuring your Hisense air conditioner operates efficiently throughout its lifespan.

  • Pros:

  • Regular maintenance ensures optimal performance.

  • It helps prevent potential issues before they escalate.

  • Cons:

  • Neglecting maintenance may lead to reduced efficiency.

  • Failure to address issues promptly might result in costly repairs.

Troubleshooting Guide

Resetting the AC

If your Hisense air conditioner is not cooling, try resetting it. Locate the reset button on the unit and press it. Alternatively, turn off the power supply for a few minutes and then turn it back on. If you’re unsure about how to perform a reset, consult the user manual for specific instructions.

Sometimes, a simple reset can resolve issues with your air conditioner’s functionality. It essentially allows the system to restart and recalibrate itself, potentially addressing any minor glitches that were causing cooling problems.

Error Codes

When troubleshooting your Hisense air conditioner, pay attention to any error codes displayed on the unit. These codes provide valuable information about what might be wrong with the appliance. Refer to the user manual to understand what each code means and take appropriate action based on its instructions.

For example, if an error code indicates a problem with airflow or refrigerant levels, you can then focus your efforts on addressing those specific issues. Understanding these error codes empowers you to make informed decisions when attempting to fix cooling problems with your air conditioner.

Thermostat Faults

One common reason why an air conditioner may not be cooling effectively is due to thermostat faults. Begin by checking if the thermostat is set to “cool” mode; sometimes, accidental adjustments can lead to inadequate cooling performance.

If your thermostat uses batteries, consider replacing them as they could be running low or depleted altogether. If you suspect that there’s a malfunction in your thermostat despite proper settings and fresh batteries, consider calibrating or replacing it as necessary.

By ensuring that your thermostat is functioning optimally and accurately reflecting temperature settings within your home environment will contribute significantly towards resolving cooling issues with your Hisense air conditioner.

Compressor Problems

The compressor plays a crucial role in facilitating effective cooling within an air conditioning system. Therefore, inspecting it for signs of damage or leaks is essential when troubleshooting performance issues. Ensure that there’s proper voltage supply reaching the compressor as inadequate power input can hinder its ability to function optimally.

Professional repair or replacement may be necessary if significant damage or malfunctions are identified during inspection.

Resolving Lack of Cold Air

Air Leakage

If your Hisense air conditioner is not cooling, one possible reason could be air leakage. Inspect the seals around windows and doors for gaps or damage. Apply weatherstripping or caulking to seal any leaks. Consider using draft stoppers under doors to prevent air leakage.

Another way to address air leakage is by ensuring that all windows and doors are properly closed when the AC is in use. This prevents warm outside air from entering the room and counteracting the cooling effect of the AC.

Low Refrigerant Levels

Low refrigerant levels can also lead to your Hisense air conditioner not cooling effectively. Engage a professional technician to check and refill refrigerant levels if necessary. Look for signs of refrigerant leaks, such as oil stains or hissing sounds.

Regular maintenance and servicing of your AC system can help prevent refrigerant loss, ensuring that it operates at peak efficiency.

Full Water Tanks

A full water tank in your Hisense air conditioner may impede its ability to cool properly. If applicable to your model, empty the water tank regularly as per manufacturer’s instructions. Check for any clogs in the drainage system and ensure proper installation and functioning of condensate pumps if they are part of your unit’s design.

Ensuring that there are no blockages within the drainage system will allow condensed water to drain freely, preventing it from interfering with the cooling process.

Obstructed Fans

Obstructed fans can hinder airflow, causing inadequate cooling performance in your Hisense air conditioner. It’s important to remove any debris or obstructions from the fan blades regularly as part of routine maintenance.

Cleaning the fan motor and lubricating it if necessary will help maintain smooth operation. Regularly checking for loose or damaged fan belts is also crucial because these components play a vital role in circulating cool air throughout your space.

Addressing Power Failures

Failed Power

If your Hisense air conditioner is not cooling, the first thing to check is the power supply. Make sure there are no interruptions in the power reaching the unit. Look for blown fuses or tripped circuit breakers in your electrical panel. Inspect all power cords and connections for any signs of damage.

If you find a blown fuse or a tripped circuit breaker, replace the fuse with one of the same amperage rating, or reset the breaker by flipping it off and then on again. Ensure that all power cords are securely connected without any visible damage.

Internal Component Check

Engaging a professional technician to inspect internal components is crucial if you’re experiencing cooling issues with your Hisense air conditioner. The technician will look for signs of wear, damage, or loose connections within the unit’s internal components.

Upon inspection, if any faulty components are identified, they should be replaced as recommended by the technician to restore proper functioning of your air conditioner.

In some cases where there’s an issue with internal components such as a malfunctioning compressor or capacitor, attempting repairs without professional guidance can lead to further damage and safety hazards.

Managing Airflow and Capacity

Cleaning Filters

One essential aspect to address is the cleanliness of the filters. First, refer to the user manual for specific instructions on removing the filters. Once removed, rinse them with water or use a vacuum cleaner to eliminate accumulated dust. It’s crucial to ensure that the filters are completely dry before reinstalling them in the unit.

Regularly cleaning air conditioner filters helps maintain proper airflow and ensures efficient cooling performance. Clogged or dirty filters can obstruct airflow, causing reduced cooling capacity and increased energy consumption. By keeping these components clean, you enhance your air conditioner’s ability to cool effectively.

Clearing Vents

In addition to filter maintenance, clearing vents is vital in optimizing an air conditioner’s performance. Use a soft brush or cloth to gently remove dust and debris from the vents. Ensuring that vents are unobstructed by furniture or other objects is equally important for maintaining optimal airflow and maximizing cooling efficiency.

Blocked vents restrict airflow, leading to uneven cooling throughout your space and potentially causing strain on the unit as it tries harder to reach desired temperatures. Consider using air purifiers in your home or office space as they can help reduce dust accumulation around vent areas.

Maintaining clear vents allows for better circulation of cooled air throughout your room or space while preventing potential issues such as overheating due to restricted airflow caused by blockages.

Fixing Remote Control Miscommunication

Synchronizing Devices

If your Hisense air conditioner is not cooling as expected, it might be due to miscommunication between the remote control and the unit. To resolve this, start by following the user manual instructions for synchronizing devices. Ensure that both the remote control and the air conditioner are connected to the same network. If there are any connectivity issues between the two devices, troubleshoot them accordingly.

Synchronizing devices can often resolve communication problems between your air conditioner and its remote control. By ensuring that both devices are on the same network, you can effectively address any miscommunication issues that may be causing your Hisense air conditioner to malfunction. Troubleshooting connectivity problems will help identify and rectify any underlying issues affecting communication between these devices.

Replacing Batteries

Another common reason for a Hisense air conditioner failing to cool properly could be related to low or dead batteries in its remote control or thermostat. Start by locating the battery compartments on these devices. Once located, replace old batteries with new ones of the correct type as specified in your user manual. It’s important to dispose of used batteries responsibly according to local regulations.

Replacing old batteries with fresh ones is a simple yet crucial step in ensuring effective communication between your air conditioner and its remote control or thermostat. Dead or low-quality batteries can lead to intermittent signals being sent from the controller, which may result in irregular functioning of your appliance.

Maintaining Your Hisense AC

Regular Cleaning

Regularly cleaning your Hisense air conditioner is essential to ensure it operates efficiently. Use a damp cloth to wipe down the exterior surfaces of the unit, removing any accumulated dust and grime. This simple maintenance task can prevent dirt from entering the system and obstructing airflow, which can lead to reduced cooling performance.

Make sure to clear away any debris or vegetation that may have accumulated around the outdoor unit. Leaves, twigs, and other obstructions can impede airflow and hinder the unit’s ability to expel heat effectively. By keeping the area around your Hisense AC clean and free from obstacles, you can help maintain optimal performance.

Furthermore, while regular surface cleaning is important for maintaining your Hisense air conditioner, periodic deep cleaning of internal components by professionals is also crucial. Over time, dirt and dust can accumulate inside the unit, affecting its overall efficiency. Scheduling professional deep cleanings at regular intervals helps ensure that all internal components are thoroughly cleaned and maintained for peak performance.

Seasonal Inspections

Before each cooling season begins, it’s advisable to arrange professional inspections for your Hisense AC. These thorough check-ups allow technicians to identify any potential issues or areas of concern before they escalate into larger problems that could affect cooling performance.

Moreover, after periods of non-use—such as during winter months—be sure to inspect your Hisense air conditioner for any signs of wear or damage. Look out for frayed wires, leaks in refrigerant lines, or worn-out insulation. Addressing these issues promptly can prevent them from escalating into major malfunctions that compromise cooling efficiency.

Lastly but importantly perform routine maintenance tasks recommended by Hisense manufacturer such as changing filters according to their guidelines will keep your AC running smoothly throughout its lifespan.

By following these maintenance tips diligently, you’ll be able to ensure that your Hisense air conditioner operates at its best capacity.

Dealing with Specific Error Codes

Understanding Codes

When your Hisense air conditioner is not cooling, it might display error codes. It’s crucial to consult the user manual to understand these codes. Record common error codes and their solutions for quick reference. If you’re unsure about an error code, seek professional assistance.

Understanding the meaning of error codes helps in identifying potential issues with your Hisense AC unit. For example, if the display shows an “E1” code, it could indicate a problem with the unit’s temperature sensor or thermistor. By referring to the user manual, you can gain insights into what each code signifies and how to address it effectively.

It’s essential to keep a record of common error codes and their solutions for quick troubleshooting. This proactive approach enables you to identify recurring issues promptly and take appropriate action before they escalate.

Seeking professional assistance when encountering unfamiliar error codes is advisable as it ensures that complex issues are addressed by qualified technicians who possess expertise in diagnosing and resolving specific problems related to Hisense air conditioners.

Quick Fixes

If your Hisense air conditioner is not cooling properly, there are some quick fixes you can try before seeking professional help.

Firstly, reset the unit by turning it off for a few minutes before restarting it. This simple step can sometimes resolve minor technical glitches that affect its cooling performance.

Another important aspect of maintaining optimal cooling efficiency is keeping filters and vents clean. Over time, dust and debris can accumulate in these areas, obstructing airflow and hindering the AC’s ability to cool effectively.

Regularly check the power supply connections to ensure there are no loose connections or electrical issues affecting your air conditioner’s performance. Faulty power supply or connections can lead to inadequate cooling output from your Hisense AC unit.

Essential Tips for Longevity

Preventive Care

Regular maintenance is crucial to ensure that your Hisense air conditioner operates efficiently. By following the manufacturer’s recommended maintenance schedule, you can prevent potential issues and extend the lifespan of your unit. Keeping the area around the AC unit clean and free from obstructions such as furniture or curtains allows for proper airflow, which is essential for optimal cooling performance. Addressing minor issues promptly also plays a significant role in preventing major breakdowns. For example, if you notice unusual sounds or reduced airflow, it’s important to investigate and address these issues before they escalate.

Maintaining your Hisense air conditioner involves simple tasks like regularly cleaning or replacing filters and checking for any debris around the outdoor unit that may obstruct airflow. These preventive measures not only contribute to better cooling but also help in reducing energy consumption over time.

Professional Servicing

Engaging certified technicians for complex repairs or component replacements ensures that your Hisense air conditioner receives expert care when needed. While some maintenance tasks can be performed by homeowners, certain repairs require professional expertise to avoid further damage to the unit.

Regularly scheduling professional servicing with qualified technicians helps in identifying potential problems early on and addressing them proactively. This proactive approach can prevent sudden malfunctions during peak usage times like summer months when an efficient cooling system is essential.

Obtaining warranties or service contracts provides long-term peace of mind regarding any unexpected repair costs associated with your Hisense air conditioner. It’s important to carefully review warranty details at the time of purchase and consider investing in an extended warranty if available, especially for high-value appliances like air conditioners.

Final Remarks

You’ve now gained a comprehensive understanding of why your Hisense air conditioner might not be cooling and how to troubleshoot and resolve these issues. Remember, regular maintenance is key to ensuring your AC’s longevity and optimal performance. Keep the airflow unobstructed, manage its capacity, and address any power failures promptly. Familiarize yourself with specific error codes and follow essential tips for maintaining your unit. By doing so, you can ensure that your Hisense AC continues to keep you cool and comfortable for years to come.

Now it’s time to put this knowledge into action! Take a proactive approach in maintaining your Hisense air conditioner to prevent future cooling issues. Regularly check for airflow obstructions, keep the unit clean, and address any error codes promptly. Your diligence will pay off in the form of a consistently cool and efficient air conditioning system.

Frequently Asked Questions

How can I identify common issues with my Hisense air conditioner?

If your Hisense air conditioner is not cooling properly, common issues could include dirty filters, low refrigerant levels, or a malfunctioning thermostat. Check these areas first to identify any visible problems.

What should I do if my Hisense air conditioner experiences a power failure?

In the event of a power failure affecting your Hisense AC unit, ensure that the power supply is stable and check for any tripped circuit breakers. If necessary, reset the unit by turning it off and on again after a few minutes.

How can I effectively troubleshoot my Hisense air conditioner’s lack of cold air?

To troubleshoot lack of cold air from your Hisense AC, start by checking the thermostat settings and ensuring that all vents are unobstructed. Clean or replace the filter regularly to maintain efficient airflow.

What steps should I take to maintain my Hisense air conditioner?

Regular maintenance for your Hisense AC includes cleaning or replacing filters every few months as well as ensuring that outdoor units are free from debris. Schedule professional servicing at least once a year for thorough inspection and maintenance.

My remote control seems to be causing communication issues with my Hisense AC – how can I fix this?

If you’re experiencing miscommunication between your remote control and the AC unit, try replacing the batteries in the remote first. If this doesn’t resolve the issue, consider re-pairing the remote according to instructions in your user manual.